{"id":1840,"date":"2024-12-20T17:39:01","date_gmt":"2024-12-20T08:39:01","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1840"},"modified":"2025-03-24T08:49:48","modified_gmt":"2025-03-23T23:49:48","slug":"c-contains%e3%83%a1%e3%82%bd%e3%83%83%e3%83%89%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a7%e3%81%a4%e3%81%ae%e5%ae%9f%e8%b7%b5%e7%9a%84%e3%81%aa%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%a8","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1840","title":{"rendered":"C# Contains\u30e1\u30bd\u30c3\u30c9\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a7\u3064\u306e\u5b9f\u8df5\u7684\u306a\u4f7f\u3044\u65b9\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30b3\u30c4"},"content":{"rendered":"\n<div class=\"toc\"><br \/>\n<b>Warning<\/b>:  Undefined array key \"is_admin\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>116<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_category_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>121<\/b><br \/>\n<br \/>\n<b>Warning<\/b>:  Undefined array key \"is_top\" in <b>\/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/sango-theme\/library\/gutenberg\/dist\/classes\/Toc.php<\/b> on line <b>128<\/b><br \/>\n    <div id=\"toc_container\" class=\"sgb-toc--bullets js-smooth-scroll\" data-dialog-title=\"\u76ee\u6b21\">\n      <p class=\"toc_title\">\u76ee\u6b21 <\/p>\n      <ul class=\"toc_list\">  <li class=\"first\">    <a href=\"#i-0\">\u306f\u3058\u3081\u306b<\/a>  <\/li>  <li>    <a href=\"#i-1\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u790e\u77e5\u8b58<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-2\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u52d5\u4f5c\u539f\u7406\u3068\u57fa\u672c\u69cb\u6587<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-3\">Contains\u30e1\u30bd\u30c3\u30c9\u3068IndexOf\u30e1\u30bd\u30c3\u30c9\u306e\u9055\u3044<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-6\">\u30c7\u30fc\u30bf\u578b\u5225Contains\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-7\">\u6587\u5b57\u5217\u64cd\u4f5c\u3067\u306eContains\u30e1\u30bd\u30c3\u30c9\u6d3b\u7528\u8853<\/a>      <\/li>      <li>        <a href=\"#i-8\">\u914d\u5217\u3068\u30ea\u30b9\u30c8\u3067\u306eContains\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-9\">\u30ab\u30b9\u30bf\u30e0\u30af\u30e9\u30b9\u3067Contains\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-10\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305fContains\u306e\u4f7f\u3044\u65b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-11\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u3067\u306eContains\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a55\u4fa1<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-12\">HashSet\u6d3b\u7528\u306b\u3088\u308b\u691c\u7d22\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-14\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-15\">\u91cd\u8907\u30c1\u30a7\u30c3\u30af\u306e\u52b9\u7387\u7684\u306a\u5b9f\u88c5\u65b9\u6cd5<\/a>      <\/li>      <li>        <a href=\"#i-16\">\u90e8\u5206\u6587\u5b57\u5217\u691c\u7d22\u306e\u6700\u9069\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-17\">\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u691c\u7d22\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-18\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-19\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li>        <a href=\"#i-20\">\u907f\u3051\u308b\u3079\u304d\u4e00\u822c\u7684\u306a\u5b9f\u88c5\u30df\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-21\">\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u3067\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-22\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u307e\u3068\u3081<\/a>  <\/li><\/ul>\n      <a href=\"#\" class=\"sgb-toc-button js-toc-button\" rel=\"nofollow\" data-open-dialog=\"true\"><i class=\"fa fa-list\"><\/i><span class=\"sgb-toc-button__text\">\u76ee\u6b21\u3078<\/span><\/a>\n    <\/div><\/div><h2 class=\"wp-block-heading\" id=\"i-0\">\u306f\u3058\u3081\u306b<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">C#\u306eContains\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6587\u5b57\u5217\u691c\u7d22\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u5185\u306e\u8981\u7d20\u78ba\u8a8d\u306a\u3069\u3001\u65e5\u5e38\u7684\u306a\u30d7\u30ed\u30b0\u30e9\u30df\u30f3\u30b0\u3067\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u91cd\u8981\u306a\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<br>\u5358\u7d14\u306b\u898b\u3048\u308b\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u304c\u3001\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u672c\u8a18\u4e8b\u3067\u5b66\u3079\u308b\u3053\u3068<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9\u3068\u52d5\u4f5c\u539f\u7406<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30c7\u30fc\u30bf\u578b\u5225\u306e\u52b9\u7387\u7684\u306a\u5b9f\u88c5\u65b9\u6cd5\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u6700\u9069\u5316\u624b\u6cd5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u5b9f\u52d9\u3067\u906d\u9047\u3059\u308b\u5177\u4f53\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9\u3068\u305d\u306e\u89e3\u6c7a\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u4e00\u822c\u7684\u306a\u5b9f\u88c5\u30df\u30b9\u3068\u305d\u306e\u5bfe\u51e6\u6cd5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30e1\u30e2\u30ea\u52b9\u7387\u3068\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u30c6\u30a3\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-1\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u57fa\u790e\u77e5\u8b58<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u52d5\u4f5c\u539f\u7406\u3068\u57fa\u672c\u69cb\u6587<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Contains\u30e1\u30bd\u30c3\u30c9\u306f\u3001C#\u3067\u914d\u5217\u3084\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3001\u6587\u5b57\u5217\u5185\u306e\u8981\u7d20\u3084\u90e8\u5206\u6587\u5b57\u5217\u306e\u5b58\u5728\u3092\u78ba\u8a8d\u3059\u308b\u305f\u3081\u306e\u57fa\u672c\u7684\u306a\u30e1\u30bd\u30c3\u30c9\u3067\u3059\u3002<br>\u3053\u306e\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u691c\u7d22\u5bfe\u8c61\u304c\u898b\u3064\u304b\u3063\u305f\u5834\u5408\u306f<code>true<\/code>\u3092\u3001\u898b\u3064\u304b\u3089\u306a\u304b\u3063\u305f\u5834\u5408\u306f<code>false<\/code>\u3092\u8fd4\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">using System;\nusing System.Collections.Generic;\nusing System.Linq;\n\nnamespace ContainsMethodBasics\n{\n    public class ContainsBasicExamples\n    {\n        \/\/ \u6587\u5b57\u5217\u3067\u306e\u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\n        public void DemonstrateStringContains()\n        {\n            \/\/ \u57fa\u672c\u7684\u306a\u691c\u7d22\n            string text = \"Hello, World!\";\n            bool containsWorld = text.Contains(\"World\");  \/\/ true\n\n            \/\/ \u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u691c\u7d22\n            bool containsHELLO = text.Contains(\n                \"HELLO\", \n                StringComparison.OrdinalIgnoreCase  \/\/ \u5e38\u306b\u660e\u793a\u7684\u306b\u6bd4\u8f03\u65b9\u6cd5\u3092\u6307\u5b9a\n            );  \/\/ true\n\n            \/\/ \u8907\u6570\u306e\u691c\u7d22\u6761\u4ef6\n            bool containsMultiple = text.Contains(\"Hello\") &amp;&amp; \n                                  text.Contains(\"World\");  \/\/ true\n        }\n\n        \/\/ \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u306e\u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b\n        public void DemonstrateCollectionContains()\n        {\n            \/\/ List\u3067\u306e\u4f7f\u7528\n            var numbers = new List&lt;int&gt; { 1, 2, 3, 4, 5 };\n            bool containsThree = numbers.Contains(3);  \/\/ true\n\n            \/\/ \u914d\u5217\u3067\u306e\u4f7f\u7528\uff08LINQ\u3092\u4f7f\u7528\uff09\n            int[] array = { 1, 2, 3, 4, 5 };\n            bool containsFour = array.Contains(4);  \/\/ true\n\n            \/\/ HashSet\u3067\u306e\u4f7f\u7528\uff08\u6700\u3082\u52b9\u7387\u7684\uff09\n            var set = new HashSet&lt;int&gt; { 1, 2, 3, 4, 5 };\n            bool containsFive = set.Contains(5);  \/\/ true\n        }\n\n        \/\/ \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u306e\u4f7f\u7528\u4f8b\n        public void DemonstrateObjectContains()\n        {\n            var users = new List&lt;User&gt;\n            {\n                new User { Id = 1, Name = \"John\" },\n                new User { Id = 2, Name = \"Jane\" }\n            };\n\n            var searchUser = new User { Id = 1, Name = \"John\" };\n\n            \/\/ \u6ce8\u610f: \u30ab\u30b9\u30bf\u30e0\u30af\u30e9\u30b9\u3067\u306fEquals\u306e\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u304c\u5fc5\u8981\n            bool containsUser = users.Contains(searchUser);  \/\/ \u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\u6b21\u7b2c\n        }\n    }\n\n    \/\/ \u30ab\u30b9\u30bf\u30e0\u30af\u30e9\u30b9\u306e\u4f8b\n    public class User : IEquatable&lt;User&gt;\n    {\n        public int Id { get; set; }\n        public string Name { get; set; }\n\n        \/\/ IEquatable&lt;T&gt;\u306e\u5b9f\u88c5\n        public bool Equals(User other)\n        {\n            if (other == null) return false;\n            return Id == other.Id &amp;&amp; Name == other.Name;\n        }\n\n        \/\/ Object.Equals\u306e\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\n        public override bool Equals(object obj)\n        {\n            return Equals(obj as User);\n        }\n\n        \/\/ GetHashCode\u306e\u30aa\u30fc\u30d0\u30fc\u30e9\u30a4\u30c9\uff08\u5fc5\u9808\uff09\n        public override int GetHashCode()\n        {\n            return HashCode.Combine(Id, Name);\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-3\">Contains\u30e1\u30bd\u30c3\u30c9\u3068IndexOf\u30e1\u30bd\u30c3\u30c9\u306e\u9055\u3044<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5404\u30e1\u30bd\u30c3\u30c9\u306e\u7279\u5fb4\u3068\u4f7f\u3044\u5206\u3051\u3092\u660e\u78ba\u306b\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-4\">\u5404\u30e1\u30bd\u30c3\u30c9\u306e\u7279\u5fb4<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class ContainsVsIndexOf\n{\n    public void DemonstrateMethodDifferences()\n    {\n        string text = \"Hello, World! Hello, Universe!\";\n\n        \/\/ Contains\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u4f8b\n        bool hasWorld = text.Contains(\"World\");  \/\/ \u5358\u7d14\u306a\u5b58\u5728\u78ba\u8a8d\n\n        \/\/ IndexOf\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u7528\u4f8b\n        int firstHello = text.IndexOf(\"Hello\");  \/\/ \u4f4d\u7f6e\u306e\u7279\u5b9a\n        if (firstHello != -1)\n        {\n            int secondHello = text.IndexOf(\"Hello\", firstHello + 1);  \/\/ \u4e8c\u56de\u76ee\u306e\u51fa\u73fe\u4f4d\u7f6e\n        }\n\n        \/\/ \u4f7f\u3044\u5206\u3051\u306e\u4f8b\n        public bool ContainsKeyword(string text, string keyword)\n        {\n            \/\/ \u5358\u7d14\u306a\u5b58\u5728\u78ba\u8a8d\u306e\u5834\u5408\u306fContains\u3092\u4f7f\u7528\n            return text.Contains(keyword, StringComparison.OrdinalIgnoreCase);\n        }\n\n        public string ExtractTextBetweenKeywords(\n            string text, \n            string startKeyword, \n            string endKeyword)\n        {\n            \/\/ \u4f4d\u7f6e\u60c5\u5831\u304c\u5fc5\u8981\u306a\u5834\u5408\u306fIndexOf\u3092\u4f7f\u7528\n            int start = text.IndexOf(startKeyword);\n            if (start == -1) return string.Empty;\n\n            start += startKeyword.Length;\n            int end = text.IndexOf(endKeyword, start);\n            if (end == -1) return string.Empty;\n\n            return text.Substring(start, end - start);\n        }\n    }\n\n    \/\/ \u30e1\u30bd\u30c3\u30c9\u306e\u7279\u5fb4\u6bd4\u8f03\n    public void CompareMethodCharacteristics(string text, string searchTerm)\n    {\n        \/\/ 1. Contains\u30e1\u30bd\u30c3\u30c9\n        bool containsResult = text.Contains(searchTerm);\n        \/\/ - \u623b\u308a\u5024\u304c bool\u578b\n        \/\/ - \u5358\u7d14\u306a\u5b58\u5728\u78ba\u8a8d\u306b\u6700\u9069\n        \/\/ - \u3088\u308a\u76f4\u611f\u7684\u306aAPI\n\n        \/\/ 2. IndexOf\u30e1\u30bd\u30c3\u30c9\n        int indexOfResult = text.IndexOf(searchTerm);\n        \/\/ - \u623b\u308a\u5024\u304c int\u578b\uff08\u4f4d\u7f6e\u60c5\u5831\uff09\n        \/\/ - \u3088\u308a\u8a73\u7d30\u306a\u60c5\u5831\u304c\u5fc5\u8981\u306a\u5834\u5408\u306b\u4f7f\u7528\n        \/\/ - \u8ffd\u52a0\u306e\u6587\u5b57\u5217\u64cd\u4f5c\u304c\u5fc5\u8981\u306a\u5834\u5408\u306b\u6709\u7528\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-5\">\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u5206\u3051\u306e\u57fa\u6e96<\/h4>\n\n\n<div id=\"id-79e1d307-4f07-4185-8c8c-e828e1c488c9\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u7279\u5fb4<\/th><th>Contains<\/th><th>IndexOf<\/th><\/tr><\/thead><tbody><tr><td>\u4e3b\u306a\u7528\u9014<\/td><td>\u5b58\u5728\u78ba\u8a8d\u306e\u307f<\/td><td>\u4f4d\u7f6e\u7279\u5b9a\u3068\u8ffd\u52a0\u51e6\u7406<\/td><\/tr><tr><td>\u623b\u308a\u5024<\/td><td>bool<\/td><td>int\uff08\u4f4d\u7f6e\uff09<\/td><\/tr><tr><td>\u4f7f\u7528\u30b7\u30fc\u30f3<\/td><td>\u5358\u7d14\u306a\u691c\u7d22<\/td><td>\u30c6\u30ad\u30b9\u30c8\u52a0\u5de5<\/td><\/tr><tr><td>\u30b3\u30fc\u30c9\u91cf<\/td><td>\u5c11\u306a\u3044<\/td><td>\u3084\u3084\u591a\u3044<\/td><\/tr><tr><td>\u30a8\u30e9\u30fc\u51e6\u7406<\/td><td>\u30b7\u30f3\u30d7\u30eb<\/td><td>\u3088\u308a\u8907\u96d1<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u30dd\u30a4\u30f3\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">Contains\u30e1\u30bd\u30c3\u30c9\u306f\u6587\u5b57\u5217\u3068\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u4e21\u65b9\u3067\u4f7f\u7528\u53ef\u80fd<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u6587\u5b57\u5217\u691c\u7d22\u3067\u306f\u5fc5\u305aStringComparison\u3092\u660e\u793a\u7684\u306b\u6307\u5b9a\u3059\u308b<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30ab\u30b9\u30bf\u30e0\u30af\u30e9\u30b9\u3067\u306f\u9069\u5207\u306bIEquatable&lt;T&gt;\u3092\u5b9f\u88c5\u3059\u308b<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u5358\u7d14\u306a\u5b58\u5728\u78ba\u8a8d\u306b\u306fContains\u3092\u3001\u4f4d\u7f6e\u60c5\u5831\u304c\u5fc5\u8981\u306a\u5834\u5408\u306fIndexOf\u3092\u4f7f\u7528\u3059\u308b<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-6\">\u30c7\u30fc\u30bf\u578b\u5225Contains\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u6587\u5b57\u5217\u64cd\u4f5c\u3067\u306eContains\u30e1\u30bd\u30c3\u30c9\u6d3b\u7528\u8853<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u6587\u5b57\u5217\u64cd\u4f5c\u306b\u304a\u3051\u308bContains\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u6700\u3082\u983b\u7e41\u306b\u4f7f\u7528\u3055\u308c\u308b\u5b9f\u88c5\u306e\u4e00\u3064\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">using System;\nusing System.Text.RegularExpressions;\nusing System.Collections.Generic;\nusing System.Linq;\n\npublic class StringContainsUsage\n{\n    \/\/ \u6587\u5b57\u5217\u691c\u7d22\u306e\u57fa\u672c\u30d1\u30bf\u30fc\u30f3\n    public class SearchManager\n    {\n        private readonly StringComparison _comparison;\n\n        public SearchManager(StringComparison comparison = StringComparison.OrdinalIgnoreCase)\n        {\n            _comparison = comparison;\n        }\n\n        \/\/ \u30ad\u30fc\u30ef\u30fc\u30c9\u691c\u7d22\u306e\u5b9f\u88c5\n        public bool ContainsKeywords(string text, IEnumerable&lt;string&gt; keywords)\n        {\n            if (string.IsNullOrEmpty(text) || keywords == null)\n                return false;\n\n            \/\/ \u3059\u3079\u3066\u306e\u30ad\u30fc\u30ef\u30fc\u30c9\u304c\u542b\u307e\u308c\u3066\u3044\u308b\u304b\u30c1\u30a7\u30c3\u30af\n            return keywords.All(keyword =&gt; \n                !string.IsNullOrEmpty(keyword) &amp;&amp; \n                text.Contains(keyword, _comparison));\n        }\n\n        \/\/ URL\u306e\u691c\u8a3c\n        public bool IsValidUrl(string url)\n        {\n            if (string.IsNullOrEmpty(url))\n                return false;\n\n            \/\/ \u5fc5\u9808\u30d7\u30ed\u30c8\u30b3\u30eb\u306e\u78ba\u8a8d\n            bool hasProtocol = url.Contains(\"http:\/\/\", _comparison) || \n                             url.Contains(\"https:\/\/\", _comparison);\n\n            \/\/ \u57fa\u672c\u7684\u306a\u30c9\u30e1\u30a4\u30f3\u69cb\u9020\u306e\u78ba\u8a8d\n            bool hasDomain = url.Contains(\".\", _comparison) &amp;&amp; \n                           !url.Contains(\" \", _comparison);\n\n            return hasProtocol &amp;&amp; hasDomain;\n        }\n\n        \/\/ \u7981\u6b62\u8a9e\u53e5\u306e\u30c1\u30a7\u30c3\u30af\uff08\u9ad8\u901f\u30fb\u7701\u30e1\u30e2\u30ea\u5b9f\u88c5\uff09\n        public bool ContainsProhibitedWords(\n            string text, \n            IReadOnlySet&lt;string&gt; prohibitedWords)\n        {\n            if (string.IsNullOrEmpty(text))\n                return false;\n\n            \/\/ HashSet\u3092\u4f7f\u7528\u3057\u3066\u9ad8\u901f\u306b\u691c\u7d22\n            return prohibitedWords.Any(word =&gt; \n                text.Contains(word, _comparison));\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-8\">\u914d\u5217\u3068\u30ea\u30b9\u30c8\u3067\u306eContains\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u914d\u5217\u3084\u30ea\u30b9\u30c8\u3067\u306eContains\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u8981\u7d20\u306e\u5b58\u5728\u78ba\u8a8d\u306b\u4fbf\u5229\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CollectionContainsUsage\n{\n    \/\/ \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c\u306e\u57fa\u672c\u30d1\u30bf\u30fc\u30f3\n    public class CollectionManager&lt;T&gt;\n    {\n        private readonly IEqualityComparer&lt;T&gt; _comparer;\n\n        public CollectionManager(IEqualityComparer&lt;T&gt; comparer = null)\n        {\n            _comparer = comparer ?? EqualityComparer&lt;T&gt;.Default;\n        }\n\n        \/\/ \u91cd\u8907\u3092\u9664\u5916\u3057\u306a\u304c\u3089\u8981\u7d20\u3092\u8ffd\u52a0\n        public void AddUniqueItems(\n            ICollection&lt;T&gt; target, \n            IEnumerable&lt;T&gt; newItems)\n        {\n            if (target == null || newItems == null)\n                throw new ArgumentNullException();\n\n            \/\/ \u8ffd\u52a0\u524d\u306b\u91cd\u8907\u30c1\u30a7\u30c3\u30af\n            var uniqueItems = new HashSet&lt;T&gt;(target, _comparer);\n            foreach (var item in newItems)\n            {\n                if (uniqueItems.Add(item))\n                {\n                    target.Add(item);\n                }\n            }\n        }\n\n        \/\/ \u914d\u5217\u3067\u306e\u52b9\u7387\u7684\u306a\u691c\u7d22\n        public bool ContainsAny(T[] array, IEnumerable&lt;T&gt; searchItems)\n        {\n            if (array == null || searchItems == null)\n                return false;\n\n            \/\/ \u691c\u7d22\u8981\u7d20\u3092HashSet\u306b\u5909\u63db\u3057\u3066\u9ad8\u901f\u5316\n            var searchSet = new HashSet&lt;T&gt;(searchItems, _comparer);\n            return array.Any(item =&gt; searchSet.Contains(item));\n        }\n\n        \/\/ \u30ea\u30b9\u30c8\u306e\u5dee\u5206\u691c\u51fa\n        public IEnumerable&lt;T&gt; FindMissingItems(\n            IList&lt;T&gt; source, \n            IEnumerable&lt;T&gt; required)\n        {\n            var sourceSet = new HashSet&lt;T&gt;(source, _comparer);\n            return required.Where(item =&gt; !sourceSet.Contains(item));\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">\u30ab\u30b9\u30bf\u30e0\u30af\u30e9\u30b9\u3067Contains\u30e1\u30bd\u30c3\u30c9\u3092\u5b9f\u88c5\u3059\u308b\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u30ab\u30b9\u30bf\u30e0\u30af\u30e9\u30b9\u3067Contains\u30e1\u30bd\u30c3\u30c9\u3092\u52b9\u679c\u7684\u306b\u4f7f\u7528\u3059\u308b\u306b\u306f\u3001\u9069\u5207\u306a\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u5b9f\u88c5\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\/\/ \u30ab\u30b9\u30bf\u30e0\u30af\u30e9\u30b9\u306e\u5b9a\u7fa9\npublic class Product : IEquatable&lt;Product&gt;\n{\n    public int Id { get; set; }\n    public string Code { get; set; }\n    public string Name { get; set; }\n    public decimal Price { get; set; }\n\n    \/\/ \u52b9\u7387\u7684\u306a\u6bd4\u8f03\u306e\u305f\u3081\u306eIEquatable&lt;T&gt;\u5b9f\u88c5\n    public bool Equals(Product other)\n    {\n        if (other == null) return false;\n\n        \/\/ \u696d\u52d9\u8981\u4ef6\u306b\u5fdc\u3058\u3066\u6bd4\u8f03\u30ed\u30b8\u30c3\u30af\u3092\u5b9f\u88c5\n        return Id == other.Id &amp;&amp; \n               Code == other.Code;  \/\/ ID\u3068\u30b3\u30fc\u30c9\u3067\u4e00\u610f\u6027\u3092\u5224\u65ad\n    }\n\n    public override bool Equals(object obj)\n    {\n        return Equals(obj as Product);\n    }\n\n    public override int GetHashCode()\n    {\n        return HashCode.Combine(Id, Code);\n    }\n}\n\n\/\/ \u30ab\u30b9\u30bf\u30e0\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5b9f\u88c5\npublic class ProductInventory\n{\n    private readonly Dictionary&lt;string, List&lt;Product&gt;&gt; _categoryIndex;\n    private readonly HashSet&lt;Product&gt; _products;\n\n    public ProductInventory()\n    {\n        _categoryIndex = new Dictionary&lt;string, List&lt;Product&gt;&gt;(\n            StringComparer.OrdinalIgnoreCase\n        );\n        _products = new HashSet&lt;Product&gt;();\n    }\n\n    \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6d3b\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u691c\u7d22\n    public bool Contains(Product product)\n    {\n        if (product == null)\n            return false;\n\n        return _products.Contains(product);\n    }\n\n    \/\/ \u30ab\u30c6\u30b4\u30ea\u30d9\u30fc\u30b9\u306e\u691c\u7d22\n    public bool ContainsByCategory(string category, Product product)\n    {\n        if (string.IsNullOrEmpty(category) || product == null)\n            return false;\n\n        return _categoryIndex.TryGetValue(category, out var products) &amp;&amp; \n               products.Contains(product);\n    }\n\n    \/\/ \u8907\u6570\u6761\u4ef6\u3067\u306e\u691c\u7d22\n    public bool ContainsByCondition(Func&lt;Product, bool&gt; condition)\n    {\n        return _products.Any(condition);\n    }\n\n    \/\/ \u88fd\u54c1\u306e\u8ffd\u52a0\uff08\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u81ea\u52d5\u66f4\u65b0\uff09\n    public void AddProduct(string category, Product product)\n    {\n        if (string.IsNullOrEmpty(category) || product == null)\n            throw new ArgumentNullException();\n\n        if (_products.Add(product))  \/\/ \u91cd\u8907\u30c1\u30a7\u30c3\u30af\u3068\u8ffd\u52a0\u3092\u4e00\u5ea6\u306b\u5b9f\u884c\n        {\n            if (!_categoryIndex.TryGetValue(category, out var products))\n            {\n                products = new List&lt;Product&gt;();\n                _categoryIndex = products;\n            }\n            products.Add(product);\n        }\n    }\n}<\/pre>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u30dd\u30a4\u30f3\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u6587\u5b57\u5217\u691c\u7d22\u3067\u306f\u5e38\u306bStringComparison\u3092\u6307\u5b9a\u3057\u3001null\u691c\u67fb\u3092\u5b9f\u65bd<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u306f\u9069\u5207\u306a\u30c7\u30fc\u30bf\u69cb\u9020\uff08HashSet\u3001Dictionary\uff09\u3092\u9078\u629e<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30ab\u30b9\u30bf\u30e0\u30af\u30e9\u30b9\u3067\u306f\u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u306b\u57fa\u3065\u3044\u305f\u6bd4\u8f03\u3092\u5b9f\u88c5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6d3b\u7528\u3057\u3066\u691c\u7d22\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u9069\u5316<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30e1\u30e2\u30ea\u52b9\u7387\u3092\u8003\u616e\u3057\u305f\u5b9f\u88c5\u3092\u5fc3\u304c\u3051\u308b<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-10\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305fContains\u306e\u4f7f\u3044\u65b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u3067\u306eContains\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a55\u4fa1<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306f\u3001\u30c7\u30fc\u30bf\u69cb\u9020\u3068\u30c7\u30fc\u30bf\u30b5\u30a4\u30ba\u306b\u3088\u3063\u3066\u5927\u304d\u304f\u7570\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">using System;\nusing System.Collections.Generic;\nusing System.Diagnostics;\nusing System.Linq;\n\npublic class ContainsPerformanceTest\n{\n    private readonly int _dataSize;\n    private readonly int _iterations;\n    private readonly Random _random = new();\n\n    public ContainsPerformanceTest(int dataSize = 1_000_000, int iterations = 10_000)\n    {\n        _dataSize = dataSize;\n        _iterations = iterations;\n    }\n\n    \/\/ \u5404\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6bd4\u8f03\n    public void CompareDataStructures()\n    {\n        \/\/ \u30c6\u30b9\u30c8\u30c7\u30fc\u30bf\u306e\u6e96\u5099\n        Console.WriteLine($\"\u30c7\u30fc\u30bf\u4ef6\u6570: {_dataSize:N0}\");\n        Console.WriteLine($\"\u691c\u7d22\u56de\u6570: {_iterations:N0}\\n\");\n\n        var numbers = Enumerable.Range(0, _dataSize).ToList();\n        var searchValues = Enumerable.Range(0, _iterations)\n            .Select(_ =&gt; _random.Next(0, _dataSize))\n            .ToArray();\n\n        var results = new Dictionary&lt;string, (TimeSpan Time, long Memory)&gt;\n        {\n            [\"List&lt;T&gt;\"] = MeasurePerformance(() =&gt; \n                TestListPerformance(numbers, searchValues)),\n            [\"Array\"] = MeasurePerformance(() =&gt; \n                TestArrayPerformance(numbers.ToArray(), searchValues)),\n            [\"HashSet\"] = MeasurePerformance(() =&gt; \n                TestHashSetPerformance(new HashSet&lt;int&gt;(numbers), searchValues)),\n            [\"SortedSet\"] = MeasurePerformance(() =&gt; \n                TestSortedSetPerformance(new SortedSet&lt;int&gt;(numbers), searchValues))\n        };\n\n        \/\/ \u7d50\u679c\u306e\u8868\u793a\n        var baseline = results.Values.Min(r =&gt; r.Time.TotalMilliseconds);\n        foreach (var result in results.OrderBy(r =&gt; r.Value.Time))\n        {\n            Console.WriteLine(\n                $\"{result.Key,-12}: \" +\n                $\"\u6642\u9593 = {result.Value.Time.TotalMilliseconds,8:N1}ms \" +\n                $\"({result.Value.Time.TotalMilliseconds \/ baseline,5:N1}x), \" +\n                $\"\u30e1\u30e2\u30ea = {result.Value.Memory \/ 1024,8:N0}KB\"\n            );\n        }\n    }\n\n    \/\/ \u5404\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u30c6\u30b9\u30c8\u30e1\u30bd\u30c3\u30c9\n    private void TestListPerformance(List&lt;int&gt; list, int[] searchValues)\n    {\n        foreach (var value in searchValues)\n        {\n            _ = list.Contains(value);\n        }\n    }\n\n    private void TestArrayPerformance(int[] array, int[] searchValues)\n    {\n        foreach (var value in searchValues)\n        {\n            _ = array.Contains(value);\n        }\n    }\n\n    private void TestHashSetPerformance(HashSet&lt;int&gt; set, int[] searchValues)\n    {\n        foreach (var value in searchValues)\n        {\n            _ = set.Contains(value);\n        }\n    }\n\n    private void TestSortedSetPerformance(SortedSet&lt;int&gt; set, int[] searchValues)\n    {\n        foreach (var value in searchValues)\n        {\n            _ = set.Contains(value);\n        }\n    }\n\n    \/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u8a08\u6e2c\n    private (TimeSpan Time, long Memory) MeasurePerformance(Action action)\n    {\n        GC.Collect();\n        GC.WaitForPendingFinalizers();\n        var startMemory = GC.GetTotalMemory(true);\n\n        var sw = Stopwatch.StartNew();\n        action();\n        sw.Stop();\n\n        var endMemory = GC.GetTotalMemory(false);\n        return (sw.Elapsed, endMemory - startMemory);\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">HashSet\u6d3b\u7528\u306b\u3088\u308b\u691c\u7d22\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u5411\u4e0a<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">HashSet\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u691c\u7d22\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u5927\u5e45\u306b\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class OptimizedSearchImplementation\n{\n    \/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u3092\u8003\u616e\u3057\u305f\u691c\u7d22\u306e\u5b9f\u88c5\n    public class MemoryEfficientSearcher&lt;T&gt;\n    {\n        private readonly IEnumerable&lt;T&gt; _source;\n        private readonly IEqualityComparer&lt;T&gt; _comparer;\n        private HashSet&lt;T&gt; _searchIndex;\n        private int _searchCount;\n        private readonly object _lock = new();\n\n        \/\/ \u95be\u5024\u3092\u8d85\u3048\u305f\u3089HashSet\u3092\u4f7f\u7528\n        private const int HashSetThreshold = 5;\n\n        public MemoryEfficientSearcher(\n            IEnumerable&lt;T&gt; source, \n            IEqualityComparer&lt;T&gt; comparer = null)\n        {\n            _source = source ?? throw new ArgumentNullException(nameof(source));\n            _comparer = comparer ?? EqualityComparer&lt;T&gt;.Default;\n        }\n\n        public bool Contains(T item)\n        {\n            \/\/ \u691c\u7d22\u56de\u6570\u304c\u5c11\u306a\u3044\u5834\u5408\u306f\u76f4\u63a5\u691c\u7d22\n            if (_searchIndex == null)\n            {\n                _searchCount++;\n                var contains = _source.Contains(item);\n\n                \/\/ \u691c\u7d22\u56de\u6570\u304c\u95be\u5024\u3092\u8d85\u3048\u305f\u3089\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u69cb\u7bc9\n                if (_searchCount &gt;= HashSetThreshold)\n                {\n                    lock (_lock)\n                    {\n                        if (_searchIndex == null)\n                        {\n                            _searchIndex = new HashSet&lt;T&gt;(_source, _comparer);\n                        }\n                    }\n                }\n\n                return contains;\n            }\n\n            return _searchIndex.Contains(item);\n        }\n\n        \/\/ \u30e1\u30e2\u30ea\u306e\u89e3\u653e\n        public void ReleaseMemory()\n        {\n            lock (_lock)\n            {\n                _searchIndex = null;\n                _searchCount = 0;\n            }\n        }\n    }\n\n    \/\/ \u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406\n    public class BatchProcessor&lt;T&gt;\n    {\n        private readonly int _batchSize;\n        private readonly IEqualityComparer&lt;T&gt; _comparer;\n\n        public BatchProcessor(\n            int batchSize = 10000, \n            IEqualityComparer&lt;T&gt; comparer = null)\n        {\n            _batchSize = batchSize;\n            _comparer = comparer ?? EqualityComparer&lt;T&gt;.Default;\n        }\n\n        \/\/ \u30d0\u30c3\u30c1\u51e6\u7406\u306b\u3088\u308b\u91cd\u8907\u30c1\u30a7\u30c3\u30af\n        public async Task&lt;HashSet&lt;T&gt;&gt; FindDuplicatesAsync(\n            IEnumerable&lt;T&gt; items, \n            CancellationToken cancellationToken = default)\n        {\n            var uniqueItems = new HashSet&lt;T&gt;(_comparer);\n            var duplicates = new HashSet&lt;T&gt;(_comparer);\n            var batch = new List&lt;T&gt;(_batchSize);\n\n            foreach (var item in items)\n            {\n                cancellationToken.ThrowIfCancellationRequested();\n                batch.Add(item);\n\n                if (batch.Count &gt;= _batchSize)\n                {\n                    await ProcessBatchAsync(batch, uniqueItems, duplicates);\n                    batch.Clear();\n                }\n            }\n\n            if (batch.Count &gt; 0)\n            {\n                await ProcessBatchAsync(batch, uniqueItems, duplicates);\n            }\n\n            return duplicates;\n        }\n\n        private Task ProcessBatchAsync(\n            List&lt;T&gt; batch, \n            HashSet&lt;T&gt; uniqueItems, \n            HashSet&lt;T&gt; duplicates)\n        {\n            return Task.Run(() =&gt;\n            {\n                foreach (var item in batch)\n                {\n                    if (!uniqueItems.Add(item))\n                    {\n                        lock (duplicates)\n                        {\n                            duplicates.Add(item);\n                        }\n                    }\n                }\n            });\n        }\n    }\n}<\/pre>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u30dd\u30a4\u30f3\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30c7\u30fc\u30bf\u69cb\u9020\u306b\u3088\u308b\u691c\u7d22\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u9055\u3044\u3092\u5b9a\u91cf\u7684\u306b\u8a55\u4fa1<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u691c\u7d22\u983b\u5ea6\u306b\u5fdc\u3058\u3066\u9069\u5207\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u9078\u629e<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30c8\u30ec\u30fc\u30c9\u30aa\u30d5\u3092\u8003\u616e<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u5834\u5408\u306f\u30d0\u30c3\u30c1\u51e6\u7406\u3092\u6d3b\u7528<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u975e\u540c\u671f\u51e6\u7406\u3068\u30ad\u30e3\u30f3\u30bb\u30ec\u30fc\u30b7\u30e7\u30f3\u5bfe\u5fdc\u3067\u67d4\u8edf\u6027\u3092\u78ba\u4fdd<\/p>\n<\/div><\/div>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-13\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u7279\u6027\u306e\u6bd4\u8f03<\/h4>\n\n\n<div id=\"id-66f8b881-96a5-4fe0-ba48-488c84d692e8\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30c7\u30fc\u30bf\u69cb\u9020<\/th><th>\u691c\u7d22\u6642\u9593\u8a08\u7b97\u91cf<\/th><th>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf<\/th><th>\u521d\u671f\u5316\u30b3\u30b9\u30c8<\/th><\/tr><\/thead><tbody><tr><td>List<\/td><td>O(n)<\/td><td>\u4f4e<\/td><td>\u4f4e<\/td><\/tr><tr><td>Array<\/td><td>O(n)<\/td><td>\u4f4e<\/td><td>\u4f4e<\/td><\/tr><tr><td>HashSet<\/td><td>O(1)<\/td><td>\u4e2d<\/td><td>\u4e2d<\/td><\/tr><tr><td>SortedSet<\/td><td>O(log n)<\/td><td>\u4e2d<\/td><td>\u9ad8<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<h2 class=\"wp-block-heading\" id=\"i-14\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u8df5\u7684\u306a\u30e6\u30fc\u30b9\u30b1\u30fc\u30b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u91cd\u8907\u30c1\u30a7\u30c3\u30af\u306e\u52b9\u7387\u7684\u306a\u5b9f\u88c5\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u91cd\u8907\u30c1\u30a7\u30c3\u30af\u306f\u5b9f\u52d9\u3067\u3088\u304f\u906d\u9047\u3059\u308b\u30b7\u30ca\u30ea\u30aa\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">using System;\nusing System.Collections.Generic;\nusing System.Threading.Tasks;\nusing System.Linq;\n\npublic class DuplicateCheckImplementation\n{\n    \/\/ \u30e6\u30fc\u30b6\u30fc\u767b\u9332\u3067\u306e\u91cd\u8907\u30c1\u30a7\u30c3\u30af\n    public class UserRegistrationValidator\n    {\n        private readonly HashSet&lt;string&gt; _existingEmails;\n        private readonly HashSet&lt;string&gt; _existingUsernames;\n        private readonly HashSet&lt;string&gt; _reservedWords;\n\n        public UserRegistrationValidator(\n            IEnumerable&lt;string&gt; existingEmails,\n            IEnumerable&lt;string&gt; existingUsernames,\n            IEnumerable&lt;string&gt; reservedWords)\n        {\n            \/\/ \u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u6bd4\u8f03\u3092\u4f7f\u7528\n            var comparer = StringComparer.OrdinalIgnoreCase;\n            _existingEmails = new HashSet&lt;string&gt;(existingEmails, comparer);\n            _existingUsernames = new HashSet&lt;string&gt;(existingUsernames, comparer);\n            _reservedWords = new HashSet&lt;string&gt;(reservedWords, comparer);\n        }\n\n        public (bool IsValid, List&lt;string&gt; Errors) ValidateNewUser(\n            string email, \n            string username)\n        {\n            var errors = new List&lt;string&gt;();\n\n            \/\/ \u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306e\u691c\u8a3c\n            if (string.IsNullOrEmpty(email))\n            {\n                errors.Add(\"\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306f\u5fc5\u9808\u3067\u3059\u3002\");\n            }\n            else if (_existingEmails.Contains(email))\n            {\n                errors.Add(\"\u3053\u306e\u30e1\u30fc\u30eb\u30a2\u30c9\u30ec\u30b9\u306f\u65e2\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\");\n            }\n\n            \/\/ \u30e6\u30fc\u30b6\u30fc\u540d\u306e\u691c\u8a3c\n            if (string.IsNullOrEmpty(username))\n            {\n                errors.Add(\"\u30e6\u30fc\u30b6\u30fc\u540d\u306f\u5fc5\u9808\u3067\u3059\u3002\");\n            }\n            else\n            {\n                if (_existingUsernames.Contains(username))\n                {\n                    errors.Add(\"\u3053\u306e\u30e6\u30fc\u30b6\u30fc\u540d\u306f\u65e2\u306b\u4f7f\u7528\u3055\u308c\u3066\u3044\u307e\u3059\u3002\");\n                }\n                if (_reservedWords.Contains(username))\n                {\n                    errors.Add(\"\u3053\u306e\u30e6\u30fc\u30b6\u30fc\u540d\u306f\u4f7f\u7528\u3067\u304d\u307e\u305b\u3093\u3002\");\n                }\n            }\n\n            return (errors.Count == 0, errors);\n        }\n    }\n\n    \/\/ \u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u3067\u306e\u91cd\u8907\u30c1\u30a7\u30c3\u30af\n    public class FileSystemValidator\n    {\n        private readonly IEqualityComparer&lt;string&gt; _comparer;\n        private readonly HashSet&lt;string&gt; _existingPaths;\n        private readonly object _lock = new();\n\n        public FileSystemValidator(StringComparison comparison = StringComparison.OrdinalIgnoreCase)\n        {\n            _comparer = StringComparer.FromComparison(comparison);\n            _existingPaths = new HashSet&lt;string&gt;(_comparer);\n        }\n\n        public bool IsPathUnique(string path)\n        {\n            if (string.IsNullOrEmpty(path))\n                throw new ArgumentNullException(nameof(path));\n\n            lock (_lock)\n            {\n                return !_existingPaths.Contains(path);\n            }\n        }\n\n        public string GenerateUniquePath(string basePath)\n        {\n            if (string.IsNullOrEmpty(basePath))\n                throw new ArgumentNullException(nameof(basePath));\n\n            lock (_lock)\n            {\n                if (!_existingPaths.Contains(basePath))\n                {\n                    _existingPaths.Add(basePath);\n                    return basePath;\n                }\n\n                string directory = Path.GetDirectoryName(basePath);\n                string fileName = Path.GetFileNameWithoutExtension(basePath);\n                string extension = Path.GetExtension(basePath);\n                int counter = 1;\n\n                while (true)\n                {\n                    string newPath = Path.Combine(\n                        directory, \n                        $\"{fileName}({counter}){extension}\"\n                    );\n\n                    if (!_existingPaths.Contains(newPath))\n                    {\n                        _existingPaths.Add(newPath);\n                        return newPath;\n                    }\n\n                    counter++;\n                }\n            }\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-16\">\u90e8\u5206\u6587\u5b57\u5217\u691c\u7d22\u306e\u6700\u9069\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u90e8\u5206\u6587\u5b57\u5217\u691c\u7d22\u3067\u306f\u3001\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u306e\u533a\u5225\u3084\u7279\u6b8a\u6587\u5b57\u306e\u51e6\u7406\u306a\u3069\u3001\u3055\u307e\u3056\u307e\u306a\u8003\u616e\u304c\u5fc5\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class SubstringSearchImplementation\n{\n    \/\/ \u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u306e\u5b9f\u88c5\n    public class SearchEngine\n    {\n        private readonly Dictionary&lt;string, SearchIndex&gt; _indices;\n        private readonly StringComparison _comparison;\n\n        public SearchEngine(StringComparison comparison = StringComparison.OrdinalIgnoreCase)\n        {\n            _indices = new Dictionary&lt;string, SearchIndex&gt;();\n            _comparison = comparison;\n        }\n\n        \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u306e\u4f5c\u6210\n        public void CreateIndex(string category, IEnumerable&lt;string&gt; documents)\n        {\n            if (string.IsNullOrEmpty(category) || documents == null)\n                throw new ArgumentNullException();\n\n            var index = new SearchIndex(_comparison);\n            foreach (var doc in documents)\n            {\n                index.AddDocument(doc);\n            }\n\n            _indices = index;\n        }\n\n        \/\/ \u30ab\u30c6\u30b4\u30ea\u5185\u3067\u306e\u691c\u7d22\n        public IEnumerable&lt;string&gt; Search(string category, string searchTerm)\n        {\n            if (!_indices.TryGetValue(category, out var index))\n                return Enumerable.Empty&lt;string&gt;();\n\n            return index.Search(searchTerm);\n        }\n\n        \/\/ \u5168\u30ab\u30c6\u30b4\u30ea\u3067\u306e\u691c\u7d22\n        public Dictionary&lt;string, IEnumerable&lt;string&gt;&gt; SearchAll(string searchTerm)\n        {\n            return _indices.ToDictionary(\n                kvp =&gt; kvp.Key,\n                kvp =&gt; kvp.Value.Search(searchTerm)\n            );\n        }\n\n        \/\/ \u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u30af\u30e9\u30b9\n        private class SearchIndex\n        {\n            private readonly HashSet&lt;string&gt; _documents;\n            private readonly Dictionary&lt;string, HashSet&lt;string&gt;&gt; _wordIndex;\n            private readonly StringComparison _comparison;\n\n            public SearchIndex(StringComparison comparison)\n            {\n                _documents = new HashSet&lt;string&gt;();\n                _wordIndex = new Dictionary&lt;string, HashSet&lt;string&gt;&gt;();\n                _comparison = comparison;\n            }\n\n            public void AddDocument(string document)\n            {\n                if (string.IsNullOrEmpty(document))\n                    return;\n\n                _documents.Add(document);\n                var words = document.Split(new[] { ' ', '.', ',', '!', '?' }, \n                    StringSplitOptions.RemoveEmptyEntries);\n\n                foreach (var word in words)\n                {\n                    var normalizedWord = word.Trim().ToLower();\n                    if (!_wordIndex.TryGetValue(normalizedWord, out var docs))\n                    {\n                        docs = new HashSet&lt;string&gt;();\n                        _wordIndex[normalizedWord] = docs;\n                    }\n                    docs.Add(document);\n                }\n            }\n\n            public IEnumerable&lt;string&gt; Search(string searchTerm)\n            {\n                if (string.IsNullOrEmpty(searchTerm))\n                    return Enumerable.Empty&lt;string&gt;();\n\n                \/\/ \u5b8c\u5168\u4e00\u81f4\u691c\u7d22\n                if (_wordIndex.TryGetValue(searchTerm.ToLower(), out var exactMatches))\n                    return exactMatches;\n\n                \/\/ \u90e8\u5206\u4e00\u81f4\u691c\u7d22\n                return _documents.Where(doc =&gt; \n                    doc.Contains(searchTerm, _comparison));\n            }\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u691c\u7d22\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u691c\u7d22\u306f\u3001\u30e6\u30fc\u30b6\u30fc\u5165\u529b\u3092\u6271\u3046\u969b\u306b\u3088\u304f\u5fc5\u8981\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CaseInsensitiveSearchImplementation\n{\n    \/\/ \u591a\u8a00\u8a9e\u5bfe\u5fdc\u306e\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\n    public class MultilingualSearchEngine\n    {\n        private readonly bool _ignoreCase;\n        private readonly bool _ignoreAccents;\n        private readonly HashSet&lt;string&gt; _searchIndex;\n\n        public MultilingualSearchEngine(\n            bool ignoreCase = true,\n            bool ignoreAccents = true)\n        {\n            _ignoreCase = ignoreCase;\n            _ignoreAccents = ignoreAccents;\n            _searchIndex = new HashSet&lt;string&gt;(\n                StringComparer.FromComparison(\n                    ignoreCase ? StringComparison.OrdinalIgnoreCase \n                              : StringComparison.Ordinal\n                )\n            );\n        }\n\n        public void AddText(string text)\n        {\n            if (string.IsNullOrEmpty(text))\n                return;\n\n            var normalizedText = NormalizeText(text);\n            _searchIndex.Add(normalizedText);\n        }\n\n        public bool Contains(string searchTerm)\n        {\n            if (string.IsNullOrEmpty(searchTerm))\n                return false;\n\n            var normalizedTerm = NormalizeText(searchTerm);\n            return _searchIndex.Contains(normalizedTerm);\n        }\n\n        private string NormalizeText(string text)\n        {\n            if (string.IsNullOrEmpty(text))\n                return text;\n\n            if (_ignoreCase)\n                text = text.ToLowerInvariant();\n\n            if (_ignoreAccents)\n            {\n                text = text.Normalize(NormalizationForm.FormD);\n                var chars = text.Where(c =&gt; \n                    CharUnicodeInfo.GetUnicodeCategory(c) != \n                    UnicodeCategory.NonSpacingMark\n                ).ToArray();\n                text = new string(chars).Normalize(NormalizationForm.FormC);\n            }\n\n            return text;\n        }\n    }\n}<\/pre>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u30dd\u30a4\u30f3\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30e6\u30fc\u30b6\u30fc\u767b\u9332\u3067\u306f\u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\u6bd4\u8f03\u3092\u4f7f\u7528<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30d5\u30a1\u30a4\u30eb\u30b7\u30b9\u30c6\u30e0\u64cd\u4f5c\u3067\u306f\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u5b9f\u88c5\u3092\u5fc3\u304c\u3051\u308b<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u691c\u7d22\u30a8\u30f3\u30b8\u30f3\u3067\u306f\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u3092\u6d3b\u7528\u3057\u3066\u691c\u7d22\u3092\u6700\u9069\u5316<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u591a\u8a00\u8a9e\u5bfe\u5fdc\u3067\u306f\u6587\u5b57\u5217\u306e\u6b63\u898f\u5316\u3092\u9069\u5207\u306b\u5b9f\u88c5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt wp-block-paragraph\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068\u691c\u7d22\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u8003\u616e<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-18\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-19\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u6700\u9069\u5316\u3059\u308b\u305f\u3081\u306e\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Contains\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306e\u30e1\u30e2\u30ea\u6700\u9069\u5316\u306f\u3001\u7279\u306b\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u6271\u3046\u5834\u5408\u306b\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">using System;\nusing System.Collections.Generic;\nusing System.Linq;\n\npublic class MemoryOptimizationExamples\n{\n    \/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u826f\u3044\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\n    public class MemoryEfficientImplementation&lt;T&gt;\n    {\n        private readonly IEnumerable&lt;T&gt; _source;\n        private readonly IEqualityComparer&lt;T&gt; _comparer;\n        private WeakReference&lt;HashSet&lt;T&gt;&gt; _cachedSet;\n        private readonly object _lock = new();\n\n        public MemoryEfficientImplementation(\n            IEnumerable&lt;T&gt; source,\n            IEqualityComparer&lt;T&gt; comparer = null)\n        {\n            _source = source ?? throw new ArgumentNullException(nameof(source));\n            _comparer = comparer ?? EqualityComparer&lt;T&gt;.Default;\n        }\n\n        \/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u3092\u8003\u616e\u3057\u305fContains\u5b9f\u88c5\n        public bool Contains(T item)\n        {\n            \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u53d6\u5f97\u3092\u8a66\u307f\u308b\n            if (_cachedSet != null &amp;&amp; \n                _cachedSet.TryGetTarget(out var hashSet))\n            {\n                return hashSet.Contains(item);\n            }\n\n            \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u306a\u3044\u5834\u5408\u306f\u76f4\u63a5\u691c\u7d22\n            lock (_lock)\n            {\n                \/\/ \u4e8c\u91cd\u30c1\u30a7\u30c3\u30af\n                if (_cachedSet != null &amp;&amp; \n                    _cachedSet.TryGetTarget(out hashSet))\n                {\n                    return hashSet.Contains(item);\n                }\n\n                \/\/ \u65b0\u3057\u3044HashSet\u3092\u4f5c\u6210\n                hashSet = new HashSet&lt;T&gt;(_source, _comparer);\n                _cachedSet = new WeakReference&lt;HashSet&lt;T&gt;&gt;(hashSet);\n                return hashSet.Contains(item);\n            }\n        }\n\n        \/\/ \u30e1\u30e2\u30ea\u89e3\u653e\u306e\u305f\u3081\u306e\u30ad\u30e3\u30c3\u30b7\u30e5\u30af\u30ea\u30a2\n        public void ClearCache()\n        {\n            lock (_lock)\n            {\n                _cachedSet = null;\n            }\n        }\n    }\n\n    \/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u53ef\u80fd\u6027\n    public class MemoryLeakExample\n    {\n        \/\/ \u554f\u984c\u306e\u3042\u308b\u5b9f\u88c5\n        private readonly Dictionary&lt;string, HashSet&lt;string&gt;&gt; _cache \n            = new(StringComparer.OrdinalIgnoreCase);\n\n        \/\/ \u554f\u984c\u70b9\uff1a\u30ad\u30e3\u30c3\u30b7\u30e5\u304c\u7121\u5236\u9650\u306b\u5897\u52a0\u3059\u308b\n        public bool ContainsBad(string category, string item)\n        {\n            if (!_cache.TryGetValue(category, out var items))\n            {\n                items = LoadItems(category);  \/\/ \u30c7\u30fc\u30bf\u8aad\u307f\u8fbc\u307f\n                _cache = items;     \/\/ \u7121\u5236\u9650\u306b\u30ad\u30e3\u30c3\u30b7\u30e5\n            }\n            return items.Contains(item);\n        }\n\n        \/\/ \u6539\u5584\u3055\u308c\u305f\u5b9f\u88c5\n        private readonly LimitedCache&lt;string, HashSet&lt;string&gt;&gt; _limitedCache \n            = new(maxItems: 100);\n\n        public bool ContainsGood(string category, string item)\n        {\n            if (!_limitedCache.TryGetValue(category, out var items))\n            {\n                items = LoadItems(category);\n                _limitedCache.Add(category, items);  \/\/ \u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30a4\u30ba\u3092\u5236\u9650\n            }\n            return items.Contains(item);\n        }\n\n        private HashSet&lt;string&gt; LoadItems(string category)\n        {\n            \/\/ \u30c7\u30fc\u30bf\u8aad\u307f\u8fbc\u307f\u306e\u5b9f\u88c5\n            return new HashSet&lt;string&gt;();\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-20\">\u907f\u3051\u308b\u3079\u304d\u4e00\u822c\u7684\u306a\u5b9f\u88c5\u30df\u30b9<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Contains\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3059\u308b\u969b\u306b\u3088\u304f\u898b\u3089\u308c\u308b\u5b9f\u88c5\u30df\u30b9\u3068\u3001\u305d\u306e\u5bfe\u51e6\u6cd5\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">public class CommonMistakesExample\n{\n    \/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f31\uff1a\u4e0d\u9069\u5207\u306a\u6587\u5b57\u5217\u6bd4\u8f03\n    public class StringComparisonMistakes\n    {\n        \/\/ \u554f\u984c\u306e\u3042\u308b\u5b9f\u88c5\n        public bool ContainsBad(string text, string searchTerm)\n        {\n            \/\/ \u554f\u984c\u70b91\uff1a\u65b0\u3057\u3044\u6587\u5b57\u5217\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u3092\u4f5c\u6210\n            \/\/ \u554f\u984c\u70b92\uff1a\u30ab\u30eb\u30c1\u30e3\u30fc\u306b\u4f9d\u5b58\u3059\u308b\u53ef\u80fd\u6027\n            return text.ToLower().Contains(searchTerm.ToLower());\n        }\n\n        \/\/ \u6539\u5584\u3055\u308c\u305f\u5b9f\u88c5\n        public bool ContainsGood(string text, string searchTerm)\n        {\n            if (text == null || searchTerm == null)\n                return false;\n\n            return text.Contains(\n                searchTerm, \n                StringComparison.OrdinalIgnoreCase\n            );\n        }\n    }\n\n    \/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f32\uff1a\u975e\u52b9\u7387\u306a\u691c\u7d22\n    public class InefficientSearch\n    {\n        \/\/ \u554f\u984c\u306e\u3042\u308b\u5b9f\u88c5\n        public bool ContainsBad&lt;T&gt;(IEnumerable&lt;T&gt; items, T searchItem)\n        {\n            \/\/ \u554f\u984c\u70b9\uff1a\u6bce\u56de\u30ea\u30b9\u30c8\u3092\u7dda\u5f62\u691c\u7d22\n            return items.ToList().Contains(searchItem);\n        }\n\n        \/\/ \u6539\u5584\u3055\u308c\u305f\u5b9f\u88c5\n        public bool ContainsGood&lt;T&gt;(IEnumerable&lt;T&gt; items, T searchItem)\n        {\n            \/\/ \u691c\u7d22\u983b\u5ea6\u306b\u5fdc\u3058\u3066HashSet\u3092\u4f7f\u7528\n            if (items is ICollection&lt;T&gt; collection)\n            {\n                if (collection.Count &gt; 100)  \/\/ \u8981\u7d20\u6570\u304c\u591a\u3044\u5834\u5408\n                {\n                    return new HashSet&lt;T&gt;(items).Contains(searchItem);\n                }\n            }\n            return items.Contains(searchItem);\n        }\n    }\n\n    \/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f33\uff1a\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u30c6\u30a3\u306e\u6b20\u5982\n    public class ThreadSafetyIssues\n    {\n        \/\/ \u554f\u984c\u306e\u3042\u308b\u5b9f\u88c5\n        private HashSet&lt;string&gt; _items = new();\n\n        public bool ContainsBad(string item)\n        {\n            \/\/ \u554f\u984c\u70b9\uff1a\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u30c6\u30a3\u306a\u3057\n            return _items.Contains(item);\n        }\n\n        \/\/ \u6539\u5584\u3055\u308c\u305f\u5b9f\u88c5\n        private readonly HashSet&lt;string&gt; _safeItems = new();\n        private readonly object _lock = new();\n\n        public bool ContainsGood(string item)\n        {\n            lock (_lock)\n            {\n                return _safeItems.Contains(item);\n            }\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u3067\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p class=\"wp-block-paragraph\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u30c6\u30b9\u30c8\u306f\u3001\u69d8\u3005\u306a\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u3092\u8003\u616e\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"csharp\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">using Microsoft.VisualStudio.TestTools.UnitTesting;\nusing System;\nusing System.Collections.Generic;\n\n[TestClass]\npublic class ContainsMethodTests\n{\n    \/\/ \u6587\u5b57\u5217\u691c\u7d22\u306e\u30c6\u30b9\u30c8\n    [TestClass]\n    public class StringContainsTests\n    {\n        [TestMethod]\n        [DataRow(\"Hello, World!\", \"World\", true)]\n        [DataRow(\"Hello, World!\", \"Python\", false)]\n        [DataRow(\"Hello, World!\", \"world\", true)]  \/\/ \u5927\u6587\u5b57\u5c0f\u6587\u5b57\u3092\u533a\u5225\u3057\u306a\u3044\n        public void Contains_BasicScenarios(\n            string text, \n            string searchTerm, \n            bool expected)\n        {\n            \/\/ Act\n            var actual = text.Contains(\n                searchTerm, \n                StringComparison.OrdinalIgnoreCase\n            );\n\n            \/\/ Assert\n            Assert.AreEqual(expected, actual);\n        }\n\n        [TestMethod]\n        public void Contains_WithNullInput_ThrowsArgumentNullException()\n        {\n            \/\/ Arrange\n            string text = \"test\";\n\n            \/\/ Act &amp; Assert\n            Assert.ThrowsException&lt;ArgumentNullException&gt;(() =&gt; \n                text.Contains(null));\n        }\n\n        [TestMethod]\n        public void Contains_WithEmptyString_ReturnsTrue()\n        {\n            \/\/ Arrange\n            string text = \"test\";\n\n            \/\/ Act\n            bool result = text.Contains(string.Empty);\n\n            \/\/ Assert\n            Assert.IsTrue(result);\n        }\n    }\n\n    \/\/ \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c\u306e\u30c6\u30b9\u30c8\n    [TestClass]\n    public class CollectionContainsTests\n    {\n        private static readonly IEqualityComparer&lt;string&gt; Comparer = \n            StringComparer.OrdinalIgnoreCase;\n\n        [TestMethod]\n        public void Contains_WithHashSet_PerformsEfficiently()\n        {\n            \/\/ Arrange\n            const int itemCount = 1_000_000;\n            var list = new List&lt;int&gt;();\n            for (int i = 0; i &lt; itemCount; i++)\n                list.Add(i);\n\n            var hashSet = new HashSet&lt;int&gt;(list);\n\n            \/\/ Act\n            var sw = System.Diagnostics.Stopwatch.StartNew();\n            bool listResult = list.Contains(itemCount - 1);\n            var listTime = sw.ElapsedTicks;\n\n            sw.Restart();\n            bool hashSetResult = hashSet.Contains(itemCount - 1);\n            var hashSetTime = sw.ElapsedTicks;\n\n            \/\/ Assert\n            Assert.IsTrue(listResult);\n            Assert.IsTrue(hashSetResult);\n            Assert.IsTrue(hashSetTime &lt; listTime);\n        }\n\n        [TestMethod]\n        public void Contains_WithCustomComparer_WorksAsExpected()\n        {\n            \/\/ Arrange\n            var items = new HashSet&lt;string&gt;(Comparer) { \"Test\" };\n\n            \/\/ Act &amp; Assert\n            Assert.IsTrue(items.Contains(\"TEST\"));\n            Assert.IsTrue(items.Contains(\"test\"));\n            Assert.IsFalse(items.Contains(\"other\"));\n        }\n    }\n}<\/pre>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u306e\u30dd\u30a4\u30f3\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u6700\u9069\u5316\n<ul class=\"wp-block-list\">\n<li>WeakReference\u3092\u4f7f\u7528\u3057\u3066\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u5236\u5fa1<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30a4\u30ba\u3092\u9069\u5207\u306b\u5236\u9650<\/li>\n\n\n\n<li>\u5fc5\u8981\u306b\u5fdc\u3058\u3066\u30e1\u30e2\u30ea\u3092\u89e3\u653e<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u4e00\u822c\u7684\u306a\u30df\u30b9\u306e\u56de\u907f\n<ul class=\"wp-block-list\">\n<li>\u6587\u5b57\u5217\u6bd4\u8f03\u306f\u5fc5\u305aStringComparison\u3092\u6307\u5b9a<\/li>\n\n\n\n<li>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306b\u306f\u9069\u5207\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u3092\u9078\u629e<\/li>\n\n\n\n<li>\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u30c6\u30a3\u3092\u78ba\u4fdd<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u306e\u5b9f\u88c5\n<ul class=\"wp-block-list\">\n<li>\u30a8\u30c3\u30b8\u30b1\u30fc\u30b9\u3092\u542b\u3080\u5305\u62ec\u7684\u306a\u30c6\u30b9\u30c8<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c6\u30b9\u30c8\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30e0Comparer\u306e\u30c6\u30b9\u30c8<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<p class=\"wp-block-paragraph\">\u3053\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u793a\u3057\u305f\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3068\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3092\u610f\u8b58\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u5b9f\u88c5\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-22\">Contains\u30e1\u30bd\u30c3\u30c9\u306e\u307e\u3068\u3081<\/h2>\n\n\n\n<p class=\"wp-block-paragraph\">Contains\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u9069\u5207\u306a\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u9078\u629e\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u8003\u616e\u3001\u305d\u3057\u3066\u6b63\u3057\u3044\u30a8\u30e9\u30fc\u51e6\u7406\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u305d\u306e\u771f\u4fa1\u3092\u767a\u63ee\u3057\u307e\u3059\u3002<br>\u7279\u306b\u5927\u898f\u6a21\u306a\u30c7\u30fc\u30bf\u3092\u6271\u3046\u5834\u5408\u3084\u3001\u9ad8\u983b\u5ea6\u306a\u691c\u7d22\u304c\u5fc5\u8981\u306a\u5834\u5408\u306f\u3001\u672c\u8a18\u4e8b\u3067\u7d39\u4ecb\u3057\u305f\u6700\u9069\u5316\u624b\u6cd5\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u52b9\u7387\u7684\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u5b9f\u88c5\u304c\u53ef\u80fd\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-block-simple sgb-box-simple sgb-box-simple--title-normal sgb-box-simple--with-border\"><div style=\"background-color:var(--wp--preset--color--sango-main);color:#FFF\" class=\"sgb-box-simple__title\">\u3053\u306e\u8a18\u4e8b\u306e\u4e3b\u306a\u30dd\u30a4\u30f3\u30c8<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ol class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u69cb\u9020\u306e\u9078\u629e\n<ul class=\"wp-block-list\">\n<li>\u691c\u7d22\u983b\u5ea6\u304c\u9ad8\u3044\u5834\u5408\u306fHashSet\u3092\u4f7f\u7528<\/li>\n\n\n\n<li>\u5c11\u91cf\u306e\u30c7\u30fc\u30bf\u3067\u306fList\/\u914d\u5217\u3067\u5341\u5206<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30d0\u30e9\u30f3\u30b9\u3092\u8003\u616e<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u5b9f\u88c5\u4e0a\u306e\u6ce8\u610f\u70b9\n<ul class=\"wp-block-list\">\n<li>\u6587\u5b57\u5217\u6bd4\u8f03\u306f\u5fc5\u305aStringComparison\u3092\u6307\u5b9a<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30a8\u30e9\u30fc\u51e6\u7406\u3068null\u30c1\u30a7\u30c3\u30af\u3092\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u30c6\u30a3\u3092\u78ba\u4fdd<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\n<ul class=\"wp-block-list\">\n<li>\u9045\u5ef6\u521d\u671f\u5316\u306b\u3088\u308b\u52b9\u7387\u5316<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u9069\u5207\u306a\u7ba1\u7406<\/li>\n\n\n\n<li>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u30d0\u30c3\u30c1\u51e6\u7406<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u5b9f\u88c5\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\n<ul class=\"wp-block-list\">\n<li>\u30ab\u30b9\u30bf\u30e0\u30af\u30e9\u30b9\u3067\u306fIEquatable&lt;T&gt;\u3092\u5b9f\u88c5<\/li>\n\n\n\n<li>\u691c\u7d22\u6761\u4ef6\u306b\u5fdc\u3058\u305f\u9069\u5207\u306a\u30a4\u30f3\u30c7\u30c3\u30af\u30b9\u4f5c\u6210<\/li>\n\n\n\n<li>\u5305\u62ec\u7684\u306a\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u5b9f\u88c5<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>Warning: Undefined array key &#8220;is_admin&#8221; in \/home\/xs392991\/dexall.co.jp\/public_html\/articles\/wp-content\/themes\/ &#8230; <\/p>\n","protected":false},"author":1,"featured_media":2849,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[4,61],"tags":[],"class_list":["post-1840","post","type-post","status-publish","format-standard","has-post-thumbnail","category-csharp","category-csharp-syntax"],"_links":{"self":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1840","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=1840"}],"version-history":[{"count":11,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1840\/revisions"}],"predecessor-version":[{"id":2850,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/posts\/1840\/revisions\/2850"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=\/wp\/v2\/media\/2849"}],"wp:attachment":[{"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=1840"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=1840"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/dexall.co.jp\/articles\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=1840"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}