{"id":1969,"date":"2024-12-25T11:51:26","date_gmt":"2024-12-25T02:51:26","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1969"},"modified":"2025-03-24T08:49:01","modified_gmt":"2025-03-23T23:49:01","slug":"c-ienumerable%e3%83%9e%e3%82%b9%e3%82%bf%e3%83%bc%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a%e3%83%91%e3%83%95%e3%82%a9%e3%83%bc%e3%83%9e%e3%83%b3%e3%82%b9%e3%82%92%e6%9c%80%e5%a4%a7%e5%8c%96%e3%81%99","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1969","title":{"rendered":"C# IEnumerable\u30de\u30b9\u30bf\u30fc\u30ac\u30a4\u30c9\uff1a\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u5316\u3059\u308b7\u3064\u306e\u5b9f\u8df5\u30c6\u30af\u30cb\u30c3\u30af"},"content":{"rendered":"\n<p>C#\u958b\u767a\u306b\u304a\u3044\u3066\u3001\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406\u306f\u5e38\u306b\u8ab2\u984c\u3068\u306a\u308a\u307e\u3059\u3002IEnumerable\u306f\u3001\u3053\u306e\u8ab2\u984c\u306b\u5bfe\u3059\u308b\u5f37\u529b\u306a\u89e3\u6c7a\u7b56\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u7279\u306b\u9045\u5ef6\u8a55\u4fa1\u306e\u7279\u6027\u3092\u6d3b\u304b\u3059\u3053\u3068\u3067\u3001\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u9ad8\u3044\u30c7\u30fc\u30bf\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002<br>\u672c\u8a18\u4e8b\u3067\u306f\u3001IEnumerable\u306e\u57fa\u672c\u304b\u3089\u5b9f\u8df5\u7684\u306a\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u307e\u3067\u3092\u3001\u5177\u4f53\u7684\u306a\u30b3\u30fc\u30c9\u4f8b\u3068\u5171\u306b\u89e3\u8aac\u3057\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\">IEnumerable\u306e\u9045\u5ef6\u8a55\u4fa1\u306e\u4ed5\u7d44\u307f\u3068\u57fa\u672c\u7684\u306a\u4f7f\u3044\u65b9<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u306b\u304a\u3051\u308b\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u6700\u9069\u5316\u624b\u6cd5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u5316\u3059\u308b\u305f\u3081\u306e\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">LINQ\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u3088\u304f\u3042\u308b\u554f\u984c\u3068\u305d\u306e\u5bfe\u51e6\u6cd5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u52b9\u679c\u7684\u306a\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u306e\u4f5c\u6210\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u3088\u308a\u9ad8\u5ea6\u306a\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u7ba1\u7406\u3078\u306e\u767a\u5c55\u7684\u306a\u624b\u6cd5<\/p>\n<\/div><\/div>\n\n\n\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\">IEnumerable\u3068\u306f\uff1f\u57fa\u790e\u304b\u3089\u7406\u89e3\u3059\u308b\u9045\u5ef6\u8a55\u4fa1\u306e\u4ed5\u7d44\u307f<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-1\">\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u30d1\u30bf\u30fc\u30f3\u3068IEnumerable\u306e\u95a2\u4fc2\u6027\u3092\u56f3\u89e3\u3067\u89e3\u8aac<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-2\">\u9045\u5ef6\u8a55\u4fa1\u304c\u3082\u305f\u3089\u3059\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u5411\u4e0a\u3068\u305d\u306e\u4ed5\u7d44\u307f<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-3\">IEnumerable\u306e\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u30b7\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-4\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u3067\u306e\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u7ba1\u7406\u624b\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-7\">\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\u306b\u304a\u3051\u308bIEnumerable\u306e\u5a01\u529b<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-9\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u5316\u3059\u308b\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-10\">\u4e0d\u8981\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u9632\u3050ToList\u306e\u9069\u5207\u306a\u4f7f\u7528\u30bf\u30a4\u30df\u30f3\u30b0<\/a>      <\/li>      <li>        <a href=\"#i-11\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u305f\u3081\u306eusing\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306e\u6d3b\u7528<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-12\">\u8907\u6570\u56de\u306e\u5217\u6319\u3092\u907f\u3051\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-13\">LINQ\u3068IEnumerable\u306e\u76f8\u4e57\u52b9\u679c\u3092\u5b9f\u73fe\u3059\u308b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-14\">\u30c1\u30a7\u30fc\u30f3\u30e1\u30bd\u30c3\u30c9\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-15\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305fLINQ\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u306e\u9078\u629e<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-16\">IEnumerable\u306e\u843d\u3068\u3057\u7a74\u3068\u5bfe\u51e6\u6cd5<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-17\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u4e3b\u306a\u539f\u56e0\u3068\u9632\u6b62\u7b56<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-18\">\u7121\u9650\u30eb\u30fc\u30d7\u3092\u9632\u3050\u305f\u3081\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-19\">\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u3067\u306eIEnumerable\u306e\u53d6\u308a\u6271\u3044<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-20\">\u30e2\u30c3\u30af\u3092\u4f7f\u7528\u3057\u305f\u52b9\u679c\u7684\u306a\u30c6\u30b9\u30c8\u624b\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-21\">\u4e00\u822c\u7684\u306a\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u3068\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u30d1\u30bf\u30fc\u30f3<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-22\">\u6b21\u306e\u30b9\u30c6\u30c3\u30d7\uff1a\u3088\u308a\u6df1\u3044C#\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u7ba1\u7406\u306e\u4e16\u754c\u3078<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-23\">IQueryable\u3068\u306e\u4f7f\u3044\u5206\u3051\u3067\u5b9f\u73fe\u3059\u308b\u6700\u9069\u5316<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-24\">\u975e\u540c\u671f\u30b9\u30c8\u30ea\u30fc\u30e0\u51e6\u7406\u3078\u306e\u767a\u5c55\u7684\u306a\u5fdc\u7528<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-25\">IEnumerable\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\">IEnumerable\u3068\u306f\uff1f\u57fa\u790e\u304b\u3089\u7406\u89e3\u3059\u308b\u9045\u5ef6\u8a55\u4fa1\u306e\u4ed5\u7d44\u307f<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-1\">\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u30d1\u30bf\u30fc\u30f3\u3068IEnumerable\u306e\u95a2\u4fc2\u6027\u3092\u56f3\u89e3\u3067\u89e3\u8aac<\/h3>\n\n\n\n<p>IEnumerable\u306f\u3001C#\u306b\u304a\u3051\u308b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u64cd\u4f5c\u306e\u57fa\u76e4\u3068\u306a\u308b\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u3059\u3002\u30b7\u30fc\u30b1\u30f3\u30b7\u30e3\u30eb\u306a\u30c7\u30fc\u30bf\u30a2\u30af\u30bb\u30b9\u3092\u53ef\u80fd\u306b\u3059\u308b\u91cd\u8981\u306a\u4ed5\u7d44\u307f\u3067\u3001\u7279\u306b\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u306b\u304a\u3044\u3066\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u5229\u7528\u3092\u5b9f\u73fe\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<p>\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u30d1\u30bf\u30fc\u30f3\u306f\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3092\u9806\u756a\u306b\u30a2\u30af\u30bb\u30b9\u3059\u308b\u65b9\u6cd5\u3092\u6a19\u6e96\u5316\u3057\u305f\u30c7\u30b6\u30a4\u30f3\u30d1\u30bf\u30fc\u30f3\u3067\u3059\u3002C#\u3067\u306f\u3001\u3053\u306e\u30d1\u30bf\u30fc\u30f3\u3092<code>IEnumerable&lt;T&gt;<\/code>\u3068<code>IEnumerator&lt;T&gt;<\/code>\u3068\u3044\u30462\u3064\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u5b9f\u88c5\u3057\u3066\u3044\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=\"\">\/\/ IEnumerable\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u57fa\u672c\u69cb\u9020\npublic interface IEnumerable&lt;T&gt;\n{\n    IEnumerator&lt;T&gt; GetEnumerator();\n}\n\n\/\/ IEnumerator\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u306e\u57fa\u672c\u69cb\u9020\npublic interface IEnumerator&lt;T&gt;\n{\n    bool MoveNext();     \/\/ \u6b21\u306e\u8981\u7d20\u306b\u79fb\u52d5\n    T Current { get; }   \/\/ \u73fe\u5728\u306e\u8981\u7d20\u3092\u53d6\u5f97\n    void Reset();        \/\/ \u5217\u6319\u3092\u30ea\u30bb\u30c3\u30c8\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">\u9045\u5ef6\u8a55\u4fa1\u304c\u3082\u305f\u3089\u3059\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u5411\u4e0a\u3068\u305d\u306e\u4ed5\u7d44\u307f<\/h3>\n\n\n\n<p>\u9045\u5ef6\u8a55\u4fa1\uff08Lazy Evaluation\uff09\u306f\u3001IEnumerable\u306e\u6700\u3082\u91cd\u8981\u306a\u7279\u5fb4\u306e1\u3064\u3067\u3059\u3002\u4ee5\u4e0b\u306e\u30b3\u30fc\u30c9\u4f8b\u3067\u3001\u305d\u306e\u52d5\u4f5c\u3092\u78ba\u8a8d\u3057\u3066\u307f\u307e\u3057\u3087\u3046\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=\"\">\/\/ \u9045\u5ef6\u8a55\u4fa1\u3092\u793a\u3059\u5b9f\u88c5\u4f8b\npublic static IEnumerable&lt;int&gt; GenerateNumbers(int max)\n{\n    Console.WriteLine(\"\u30b8\u30a7\u30cd\u30ec\u30fc\u30bf\u30fc\u958b\u59cb\");\n    for (int i = 0; i &lt; max; i++)\n    {\n        Console.WriteLine($\"\u6570\u5024 {i} \u3092\u751f\u6210\u4e2d\");\n        yield return i;\n    }\n}\n\n\/\/ \u4f7f\u7528\u4f8b\nvar numbers = GenerateNumbers(1000000); \/\/ \u3053\u306e\u6642\u70b9\u3067\u306f\u5b9f\u969b\u306e\u8a08\u7b97\u306f\u884c\u308f\u308c\u306a\u3044\nConsole.WriteLine(\"\u751f\u6210\u958b\u59cb\");\nforeach (var num in numbers.Take(5)) \/\/ \u5fc5\u8981\u306a\u8981\u7d20\u3060\u3051\u304c\u751f\u6210\u3055\u308c\u308b\n{\n    Console.WriteLine($\"\u53d6\u5f97\u3057\u305f\u6570\u5024: {num}\");\n}<\/pre>\n\n\n\n<p>\u3053\u306e\u5b9f\u88c5\u306b\u3088\u308a\u3001\u4ee5\u4e0b\u306e\u30e1\u30ea\u30c3\u30c8\u304c\u5f97\u3089\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-box sng-box box6\">\n<ol class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u5411\u4e0a\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u30c7\u30fc\u30bf\u306f\u5fc5\u8981\u306b\u306a\u3063\u305f\u6642\u70b9\u3067\u751f\u6210<\/li>\n\n\n\n<li>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3067\u3082\u30e1\u30e2\u30ea\u6d88\u8cbb\u3092\u6291\u5236<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u51e6\u7406\u306e\u6700\u9069\u5316\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u4e0d\u8981\u306a\u8a08\u7b97\u3092\u56de\u907f<\/li>\n\n\n\n<li>\u5fc5\u8981\u306a\u8981\u7d20\u306e\u307f\u3092\u51e6\u7406<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div>\n\n\n\n<p>\u9045\u5ef6\u8a55\u4fa1\u304c\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306b\u4e0e\u3048\u308b\u5f71\u97ff\u3092\u3001\u5177\u4f53\u7684\u306a\u4f8b\u3067\u898b\u3066\u307f\u307e\u3057\u3087\u3046\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=\"\">\/\/ \u30e1\u30e2\u30ea\u52b9\u7387\u306e\u6bd4\u8f03\npublic static void CompareMemoryUsage()\n{\n    \/\/ \u5373\u6642\u8a55\u4fa1\uff08ToList\u4f7f\u7528\uff09\n    var immediate = Enumerable.Range(0, 10000000).ToList(); \/\/ \u3059\u3050\u306b\u30e1\u30e2\u30ea\u3092\u6d88\u8cbb\n\n    \/\/ \u9045\u5ef6\u8a55\u4fa1\uff08IEnumerable\u4f7f\u7528\uff09\n    var lazy = Enumerable.Range(0, 10000000); \/\/ \u3053\u306e\u6642\u70b9\u3067\u306f\u30e1\u30e2\u30ea\u3092\u307b\u3068\u3093\u3069\u4f7f\u7528\u3057\u306a\u3044\n\n    \/\/ \u5fc5\u8981\u306a\u90e8\u5206\u3060\u3051\u3092\u51e6\u7406\n    var first10 = lazy.Take(10); \/\/ 10\u500b\u306e\u8981\u7d20\u3060\u3051\u3092\u51e6\u7406\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\">\u5b9f\u969b\u306e\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u9055\u3044<\/div><div class=\"sgb-box-simple__body\" style=\"border-color:var(--wp--preset--color--sango-main);background-color:#FFF\">\n<ul class=\"wp-block-list\">\n<li>\u5373\u6642\u8a55\u4fa1\uff1a\u7d0440MB\uff081000\u4e07\u500b\u306eint\u578b\u30c7\u30fc\u30bf\uff09<\/li>\n\n\n\n<li>\u9045\u5ef6\u8a55\u4fa1\uff1a\u6570KB\uff08\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u72b6\u614b\u306e\u307f\uff09<\/li>\n<\/ul>\n<\/div><\/div>\n\n\n\n<p>IEnumerable\u3068\u9045\u5ef6\u8a55\u4fa1\u306e\u7d44\u307f\u5408\u308f\u305b\u306f\u3001\u4ee5\u4e0b\u306e\u70b9\u3067\u5f37\u529b\u306a\u30c4\u30fc\u30eb\u3068\u306a\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<div class=\"wp-block-sgb-box sng-box box6\">\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u5927\u5e45\u306a\u6539\u5584<\/li>\n\n\n\n<li>\u5fc5\u8981\u306a\u51e6\u7406\u3060\u3051\u3092\u5b9f\u884c\u3059\u308b\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u30b9\u30b1\u30fc\u30e9\u30d6\u30eb\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u306e\u5b9f\u73fe<\/li>\n\n\n\n<li>\u67d4\u8edf\u306a\u30c7\u30fc\u30bf\u64cd\u4f5c\u306e\u53ef\u80fd\u6027<\/li>\n<\/ul>\n<\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-3\">IEnumerable\u306e\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u30b7\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-4\">\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u3067\u306e\u52b9\u7387\u7684\u306a\u30e1\u30e2\u30ea\u7ba1\u7406\u624b\u6cd5<\/h3>\n\n\n\n<p>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u51e6\u7406\u306b\u304a\u3044\u3066\u3001IEnumerable\u306e\u9069\u5207\u306a\u6d3b\u7528\u306f\u975e\u5e38\u306b\u91cd\u8981\u3067\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u5b9f\u8df5\u7684\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-5\">\u5b9f\u8df5\u7684\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/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 LargeDataProcessor\n{\n    \/\/ \u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406\u4f8b\n    public static IEnumerable&lt;ProcessedData&gt; ProcessLargeDataSet(IEnumerable&lt;RawData&gt; rawData)\n    {\n        \/\/ \u30c1\u30e3\u30f3\u30af\u5358\u4f4d\u3067\u306e\u51e6\u7406\u306b\u3088\u308a\u3001\u30e1\u30e2\u30ea\u4f7f\u7528\u3092\u6700\u9069\u5316\n        return rawData\n            .Where(data =&gt; data != null)           \/\/ null \u30c1\u30a7\u30c3\u30af\n            .Select(data =&gt; new ProcessedData      \/\/ \u30c7\u30fc\u30bf\u5909\u63db\n            {\n                Id = data.Id,\n                ProcessedValue = ProcessValue(data.Value)\n            })\n            .Where(processed =&gt; processed.IsValid); \/\/ \u30d0\u30ea\u30c7\u30fc\u30b7\u30e7\u30f3\n    }\n\n    \/\/ \u30d0\u30c3\u30c1\u51e6\u7406\u306e\u5b9f\u88c5\u4f8b\n    public static async Task ProcessInBatches&lt;T&gt;(\n        IEnumerable&lt;T&gt; items, \n        int batchSize,\n        Func&lt;IEnumerable&lt;T&gt;, Task&gt; batchProcessor)\n    {\n        var currentBatch = new List&lt;T&gt;(batchSize);\n\n        foreach (var item in items)\n        {\n            currentBatch.Add(item);\n\n            if (currentBatch.Count &gt;= batchSize)\n            {\n                await batchProcessor(currentBatch);\n                currentBatch.Clear();\n            }\n        }\n\n        if (currentBatch.Any())\n        {\n            await batchProcessor(currentBatch);\n        }\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-6\">\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u306e\u305f\u3081\u306e\u30d1\u30bf\u30fc\u30f3<\/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=\"\">\/\/ \u5927\u304d\u306a\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u3092\u30c1\u30e3\u30f3\u30af\u306b\u5206\u5272\u3057\u3066\u51e6\u7406\npublic static IEnumerable&lt;IEnumerable&lt;T&gt;&gt; Chunk&lt;T&gt;(\n    this IEnumerable&lt;T&gt; source, \n    int chunkSize)\n{\n    while (source.Any())\n    {\n        yield return source.Take(chunkSize);\n        source = source.Skip(chunkSize);\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-7\">\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\u306b\u304a\u3051\u308bIEnumerable\u306e\u5a01\u529b<\/h3>\n\n\n\n<p>\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\u3067\u306f\u3001IEnumerable\u306e\u9045\u5ef6\u8a55\u4fa1\u7279\u6027\u3092\u6700\u5927\u9650\u306b\u6d3b\u7528\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 StreamingDataProcessor\n{\n    \/\/ \u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u30c7\u30fc\u30bf\u51e6\u7406\u306e\u4f8b\n    public static IEnumerable&lt;TResult&gt; ProcessDataStream&lt;TSource, TResult&gt;(\n        IEnumerable&lt;TSource&gt; source,\n        Func&lt;TSource, TResult&gt; processor)\n    {\n        foreach (var item in source)\n        {\n            \/\/ 1\u9805\u76ee\u305a\u3064\u51e6\u7406\u3057\u3066\u7d50\u679c\u3092\u8fd4\u3059\n            yield return processor(item);\n        }\n    }\n\n    \/\/ \u30ea\u30a2\u30eb\u30bf\u30a4\u30e0\u30c7\u30fc\u30bf\u51e6\u7406\u306e\u4f8b\n    public static async Task ProcessRealTimeData&lt;T&gt;(\n        IEnumerable&lt;T&gt; dataStream,\n        Func&lt;T, Task&gt; processor,\n        CancellationToken cancellationToken = default)\n    {\n        foreach (var data in dataStream)\n        {\n            if (cancellationToken.IsCancellationRequested)\n                break;\n\n            await processor(data);\n        }\n    }\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-8\">\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u5236\u5fa1\u3068\u6700\u9069\u5316<\/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=\"\">\/\/ \u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3092\u76e3\u8996\u3057\u306a\u304c\u3089\u306e\u51e6\u7406\npublic static IEnumerable&lt;T&gt; WithMemoryCheck&lt;T&gt;(\n    this IEnumerable&lt;T&gt; source,\n    long memoryThreshold)\n{\n    foreach (var item in source)\n    {\n        if (GC.GetTotalMemory(false) &gt; memoryThreshold)\n        {\n            GC.Collect();\n        }\n        yield return item;\n    }\n}\n\n\/\/ \u30ea\u30bd\u30fc\u30b9\u89e3\u653e\u306e\u9069\u5207\u306a\u7ba1\u7406\npublic static IEnumerable&lt;T&gt; WithDisposableTracking&lt;T&gt;(\n    this IEnumerable&lt;T&gt; source,\n    Action&lt;T&gt; disposeAction) where T : IDisposable\n{\n    foreach (var item in source)\n    {\n        yield return item;\n        disposeAction(item);\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\">IEnumerable\u3092\u6d3b\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u51e6\u7406\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\">\u30c1\u30e3\u30f3\u30af\u51e6\u7406\u306b\u3088\u308b\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\u306b\u3088\u308b\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406\u306e\u9069\u5207\u306a\u5b9f\u88c5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u30ad\u30e3\u30f3\u30bb\u30ec\u30fc\u30b7\u30e7\u30f3\u51e6\u7406\u306e\u7d44\u307f\u8fbc\u307f<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u30e1\u30e2\u30ea\u76e3\u8996\u3068\u30ac\u30d9\u30fc\u30b8\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u5236\u5fa1<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-9\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u5316\u3059\u308b\u5b9f\u88c5\u30c6\u30af\u30cb\u30c3\u30af<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-10\">\u4e0d\u8981\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u9632\u3050ToList\u306e\u9069\u5207\u306a\u4f7f\u7528\u30bf\u30a4\u30df\u30f3\u30b0<\/h3>\n\n\n\n<p>ToList\u30e1\u30bd\u30c3\u30c9\u306e\u4e0d\u9069\u5207\u306a\u4f7f\u7528\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u9069\u5207\u306a\u4f7f\u7528\u65b9\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 ToListOptimization\n{\n    \/\/ \u60aa\u3044\u4f8b\uff1a\u4e0d\u5fc5\u8981\u306aToList\u306e\u4f7f\u7528\n    public static IEnumerable&lt;int&gt; BadExample(IEnumerable&lt;int&gt; numbers)\n    {\n        var list = numbers.ToList(); \/\/ \u4e0d\u8981\u306a\u30e1\u30e2\u30ea\u5272\u308a\u5f53\u3066\n        return list.Where(n =&gt; n &gt; 0);\n    }\n\n    \/\/ \u826f\u3044\u4f8b\uff1a\u5fc5\u8981\u306a\u5834\u5408\u306e\u307fToList\u3092\u4f7f\u7528\n    public static IEnumerable&lt;int&gt; GoodExample(IEnumerable&lt;int&gt; numbers)\n    {\n        \/\/ \u8907\u6570\u56de\u306e\u5217\u6319\u304c\u5fc5\u8981\u306a\u5834\u5408\u306e\u307fToList\u3092\u4f7f\u7528\n        if (RequiresMultipleEnumeration(numbers))\n        {\n            return numbers.ToList();\n        }\n        return numbers;\n    }\n\n    \/\/ ToList\u304c\u5fc5\u8981\u306a\u30b1\u30fc\u30b9\n    public static void ValidToListUsage(IEnumerable&lt;int&gt; numbers)\n    {\n        \/\/ 1. \u8907\u6570\u56de\u306e\u5217\u6319\u304c\u5fc5\u8981\u306a\u5834\u5408\n        var count = numbers.Count();\n        var sum = numbers.Sum();\n\n        \/\/ 2. \u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u64cd\u4f5c\u304c\u5fc5\u8981\u306a\u5834\u5408\n        var list = numbers.ToList();\n        Parallel.ForEach(list, ProcessItem);\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-11\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u305f\u3081\u306eusing\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306e\u6d3b\u7528<\/h3>\n\n\n\n<p>IEnumerable\u3092\u4f7f\u7528\u3059\u308b\u969b\u3001\u9069\u5207\u306a\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406\u304c\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=\"\">public class ResourceManagement\n{\n    \/\/ \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u3092\u9632\u3050\u5b9f\u88c5\u4f8b\n    public static async Task ProcessLargeFile(string filePath)\n    {\n        \/\/ using \u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306b\u3088\u308b\u9069\u5207\u306a\u30ea\u30bd\u30fc\u30b9\u89e3\u653e\n        await using var fileStream = File.OpenRead(filePath);\n        using var reader = new StreamReader(fileStream);\n\n        \/\/ \u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u30e1\u30bd\u30c3\u30c9\u306e\u5b9f\u88c5\n        static IEnumerable&lt;string&gt; ReadLines(StreamReader reader)\n        {\n            string line;\n            while ((line = reader.ReadLine()) != null)\n            {\n                yield return line;\n            }\n        }\n\n        foreach (var line in ReadLines(reader))\n        {\n            await ProcessLine(line);\n        }\n    }\n\n    \/\/ IDisposable\u3092\u5b9f\u88c5\u3057\u305f\u30ab\u30b9\u30bf\u30e0\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\n    public class DisposableEnumerator&lt;T&gt; : IEnumerable&lt;T&gt;, IDisposable\n    {\n        private readonly IEnumerable&lt;T&gt; _source;\n        private bool _disposed;\n\n        public DisposableEnumerator(IEnumerable&lt;T&gt; source)\n        {\n            _source = source;\n        }\n\n        public IEnumerator&lt;T&gt; GetEnumerator()\n        {\n            if (_disposed)\n                throw new ObjectDisposedException(nameof(DisposableEnumerator&lt;T&gt;));\n\n            return _source.GetEnumerator();\n        }\n\n        IEnumerator IEnumerable.GetEnumerator() =&gt; GetEnumerator();\n\n        public void Dispose()\n        {\n            if (!_disposed)\n            {\n                \/\/ \u30ea\u30bd\u30fc\u30b9\u306e\u89e3\u653e\u51e6\u7406\n                _disposed = true;\n            }\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-12\">\u8907\u6570\u56de\u306e\u5217\u6319\u3092\u907f\u3051\u308b\u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565<\/h3>\n\n\n\n<p>\u52b9\u7387\u7684\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565\u306e\u5b9f\u88c5\u4f8b\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 CachingStrategies\n{\n    \/\/ \u30e1\u30e2\u5316\u3092\u4f7f\u7528\u3057\u305f\u30ad\u30e3\u30c3\u30b7\u30e5\u5b9f\u88c5\n    public static class Memoization&lt;TKey, TValue&gt;\n    {\n        private static readonly ConcurrentDictionary&lt;TKey, TValue&gt; _cache \n            = new ConcurrentDictionary&lt;TKey, TValue&gt;();\n\n        public static IEnumerable&lt;TValue&gt; GetOrCreate(\n            TKey key, \n            Func&lt;TKey, IEnumerable&lt;TValue&gt;&gt; valueFactory)\n        {\n            if (_cache.TryGetValue(key, out var cachedValue))\n            {\n                return new[] { cachedValue };\n            }\n\n            var values = valueFactory(key).ToList();\n            foreach (var value in values)\n            {\n                _cache.TryAdd(key, value);\n                yield return value;\n            }\n        }\n    }\n\n    \/\/ \u9045\u5ef6\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u5b9f\u88c5\n    public static IEnumerable&lt;T&gt; LazyCache&lt;T&gt;(\n        this IEnumerable&lt;T&gt; source,\n        int cacheSize = 1000)\n    {\n        var cache = new Queue&lt;T&gt;(cacheSize);\n\n        foreach (var item in source)\n        {\n            if (cache.Count &gt;= cacheSize)\n            {\n                cache.Dequeue();\n            }\n\n            cache.Enqueue(item);\n            yield return item;\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\">\u5b9f\u88c5\u6642\u306e\u91cd\u8981\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>ToList\u306e\u4f7f\u7528\u30bf\u30a4\u30df\u30f3\u30b0\n<ul class=\"wp-block-list\">\n<li>\u8907\u6570\u56de\u306e\u5217\u6319\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u306a\u64cd\u4f5c\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>\u30d1\u30e9\u30ec\u30eb\u51e6\u7406\u3092\u884c\u3046\u5834\u5408<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\n<ul class=\"wp-block-list\">\n<li>using\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306e\u9069\u5207\u306a\u4f7f\u7528<\/li>\n\n\n\n<li>IDisposable\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u30ea\u30fc\u30af\u306e\u9632\u6b62<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565\u306e\u9078\u629e\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u30d0\u30e9\u30f3\u30b9<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u30b5\u30a4\u30ba\u306e\u9069\u5207\u306a\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u30b9\u30ec\u30c3\u30c9\u30bb\u30fc\u30d5\u6027\u306e\u8003\u616e<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001IEnumerable\u3092\u4f7f\u7528\u3057\u305f\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u6700\u5927\u9650\u306b\u5f15\u304d\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-13\">LINQ\u3068IEnumerable\u306e\u76f8\u4e57\u52b9\u679c\u3092\u5b9f\u73fe\u3059\u308b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u30c1\u30a7\u30fc\u30f3\u30e1\u30bd\u30c3\u30c9\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>LINQ\u306e\u30c1\u30a7\u30fc\u30f3\u30e1\u30bd\u30c3\u30c9\u306f\u5f37\u529b\u3067\u3059\u304c\u3001\u9069\u5207\u306b\u4f7f\u7528\u3057\u306a\u3044\u3068\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5f71\u97ff\u3092\u4e0e\u3048\u308b\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002\u4ee5\u4e0b\u306b\u3001\u6700\u9069\u5316\u306e\u30c6\u30af\u30cb\u30c3\u30af\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 LinqOptimization\n{\n    \/\/ \u975e\u52b9\u7387\u7684\u306a\u30c1\u30a7\u30fc\u30f3\u30e1\u30bd\u30c3\u30c9\u306e\u4f8b\n    public static IEnumerable&lt;int&gt; IneffectiveChaining(IEnumerable&lt;int&gt; numbers)\n    {\n        return numbers\n            .Where(n =&gt; n &gt; 0)\n            .ToList()           \/\/ \u4e0d\u8981\u306a\u30ea\u30b9\u30c8\u5316\n            .Where(n =&gt; n &lt; 100)\n            .ToList()           \/\/ \u518d\u5ea6\u306e\u4e0d\u8981\u306a\u30ea\u30b9\u30c8\u5316\n            .OrderBy(n =&gt; n);\n    }\n\n    \/\/ \u6700\u9069\u5316\u3055\u308c\u305f\u30c1\u30a7\u30fc\u30f3\u30e1\u30bd\u30c3\u30c9\u306e\u4f8b\n    public static IEnumerable&lt;int&gt; OptimizedChaining(IEnumerable&lt;int&gt; numbers)\n    {\n        return numbers\n            .Where(n =&gt; n &gt; 0 &amp;&amp; n &lt; 100)  \/\/ \u6761\u4ef6\u3092\u30de\u30fc\u30b8\n            .OrderBy(n =&gt; n);              \/\/ \u6700\u5f8c\u306b\u4e00\u5ea6\u3060\u3051\u5b9f\u884c\n    }\n\n    \/\/ \u8907\u96d1\u306a\u51e6\u7406\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u4f8b\n    public static IEnumerable&lt;Customer&gt; OptimizeComplexQuery(\n        IEnumerable&lt;Customer&gt; customers,\n        IEnumerable&lt;Order&gt; orders)\n    {\n        \/\/ \u983b\u7e41\u306b\u4f7f\u7528\u3059\u308b\u30c7\u30fc\u30bf\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\n        var activeOrders = orders\n            .Where(o =&gt; o.IsActive)\n            .ToLookup(o =&gt; o.CustomerId);\n\n        return customers\n            .Where(c =&gt; c.IsActive)\n            .Select(c =&gt; new Customer\n            {\n                Id = c.Id,\n                Name = c.Name,\n                Orders = activeOrders[c.Id]  \/\/ \u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u4f7f\u7528\u3057\u3066\u52b9\u7387\u7684\u306b\u7d50\u5408\n            });\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-15\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u610f\u8b58\u3057\u305fLINQ\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u306e\u9078\u629e<\/h3>\n\n\n\n<p>LINQ\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u306e\u9078\u629e\u306f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\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 LinqOperatorOptimization\n{\n    \/\/ \u52b9\u7387\u7684\u306a\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u9078\u629e\u306e\u4f8b\n    public static class QueryOptimization\n    {\n        \/\/ First vs FirstOrDefault \u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051\n        public static T GetItem&lt;T&gt;(IEnumerable&lt;T&gt; items, Func&lt;T, bool&gt; predicate)\n        {\n            \/\/ \u8981\u7d20\u304c\u5fc5\u305a\u5b58\u5728\u3059\u308b\u5834\u5408\u306fFirst\u3092\u4f7f\u7528\n            if (ItemExists(items))\n            {\n                return items.First(predicate);\n            }\n\n            \/\/ \u8981\u7d20\u304c\u5b58\u5728\u3057\u306a\u3044\u53ef\u80fd\u6027\u304c\u3042\u308b\u5834\u5408\u306fFirstOrDefault\u3092\u4f7f\u7528\n            return items.FirstOrDefault(predicate);\n        }\n\n        \/\/ Any vs Count \u306e\u4f7f\u3044\u5206\u3051\n        public static bool HasElements&lt;T&gt;(IEnumerable&lt;T&gt; items, Func&lt;T, bool&gt; predicate)\n        {\n            \/\/ \u5b58\u5728\u78ba\u8a8d\u306e\u307f\u306e\u5834\u5408\u306fAny\u3092\u4f7f\u7528\uff08\u3088\u308a\u52b9\u7387\u7684\uff09\n            return items.Any(predicate);\n\n            \/\/ \u4ee5\u4e0b\u306f\u975e\u52b9\u7387\n            \/\/ return items.Count(predicate) &gt; 0;\n        }\n\n        \/\/ Select + Where vs Where + Select \u306e\u6700\u9069\u5316\n        public static IEnumerable&lt;TResult&gt; OptimizeSelectWhere&lt;TSource, TResult&gt;(\n            IEnumerable&lt;TSource&gt; source,\n            Func&lt;TSource, TResult&gt; selector,\n            Func&lt;TResult, bool&gt; predicate)\n        {\n            \/\/ \u51e6\u7406\u306e\u9806\u5e8f\u3092\u6700\u9069\u5316\n            return source\n                .Where(item =&gt; predicate(selector(item)))  \/\/ \u5148\u306b\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\n                .Select(selector);                         \/\/ \u5f8c\u306b\u5909\u63db\n        }\n    }\n\n    \/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u8003\u616e\u3057\u305f\u30b0\u30eb\u30fc\u30d7\u5316\u51e6\u7406\n    public static class GroupingOptimization\n    {\n        public static IEnumerable&lt;IGrouping&lt;TKey, TSource&gt;&gt; OptimizeGrouping&lt;TSource, TKey&gt;(\n            IEnumerable&lt;TSource&gt; source,\n            Func&lt;TSource, TKey&gt; keySelector)\n        {\n            \/\/ ToLookup\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u30b0\u30eb\u30fc\u30d7\u5316\n            return source.ToLookup(keySelector);\n        }\n\n        \/\/ \u96c6\u8a08\u51e6\u7406\u306e\u6700\u9069\u5316\n        public static IDictionary&lt;TKey, int&gt; OptimizeAggregation&lt;TSource, TKey&gt;(\n            IEnumerable&lt;TSource&gt; source,\n            Func&lt;TSource, TKey&gt; keySelector)\n        {\n            return source\n                .GroupBy(keySelector)\n                .ToDictionary(\n                    g =&gt; g.Key,\n                    g =&gt; g.Count());\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\">\u52b9\u7387\u7684\u306aLINQ\u64cd\u4f5c\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>\u30aa\u30da\u30ec\u30fc\u30bf\u30fc\u306e\u9078\u629e\u57fa\u6e96\n<ul class=\"wp-block-list\">\n<li>Any(): \u5b58\u5728\u78ba\u8a8d\u306e\u307f\u306e\u5834\u5408<\/li>\n\n\n\n<li>Count(): \u6b63\u78ba\u306a\u6570\u304c\u5fc5\u8981\u306a\u5834\u5408<\/li>\n\n\n\n<li>FirstOrDefault(): null\u8a31\u5bb9\u306e\u5834\u5408<\/li>\n\n\n\n<li>First(): \u8981\u7d20\u304c\u5fc5\u305a\u5b58\u5728\u3059\u308b\u5834\u5408<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316\u306e\u30c6\u30af\u30cb\u30c3\u30af\n<ul class=\"wp-block-list\">\n<li>\u4e0d\u8981\u306aToList\u306e\u56de\u907f<\/li>\n\n\n\n<li>\u6761\u4ef6\u306e\u30de\u30fc\u30b8\u306b\u3088\u308b\u51e6\u7406\u306e\u52b9\u7387\u5316<\/li>\n\n\n\n<li>\u30eb\u30c3\u30af\u30a2\u30c3\u30d7\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u7d50\u5408<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565\u306e\u63a1\u7528<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u9045\u5ef6\u8a55\u4fa1\u306e\u6d3b\u7528\n<ul class=\"wp-block-list\">\n<li>\u5fc5\u8981\u306a\u30c7\u30fc\u30bf\u306e\u307f\u3092\u51e6\u7406<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u51e6\u7406\u306e\u52b9\u7387\u5316<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\u3092\u9069\u5207\u306b\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001LINQ\u3068IEnumerable\u306e\u76f8\u4e57\u52b9\u679c\u3092\u6700\u5927\u9650\u306b\u5f15\u304d\u51fa\u3059\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-16\">IEnumerable\u306e\u843d\u3068\u3057\u7a74\u3068\u5bfe\u51e6\u6cd5<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-17\">\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u4e3b\u306a\u539f\u56e0\u3068\u9632\u6b62\u7b56<\/h3>\n\n\n\n<p>IEnumerable\u306e\u4f7f\u7528\u6642\u306b\u3088\u304f\u767a\u751f\u3059\u308b\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u539f\u56e0\u3068\u3001\u305d\u306e\u5bfe\u51e6\u65b9\u6cd5\u3092\u89e3\u8aac\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 MemoryLeakPrevention\n{\n    \/\/ \u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u304c\u767a\u751f\u3059\u308b\u4f8b\n    public class ProblematicImplementation\n    {\n        private IEnumerable&lt;LargeObject&gt; _cachedData;\n\n        \/\/ \u554f\u984c\u306e\u3042\u308b\u5b9f\u88c5\n        public void ProcessData(IEnumerable&lt;LargeObject&gt; data)\n        {\n            _cachedData = data;  \/\/ \u53c2\u7167\u3092\u4fdd\u6301\u3057\u7d9a\u3051\u308b\n\n            foreach (var item in _cachedData)\n            {\n                ProcessItem(item);\n            }\n        }\n    }\n\n    \/\/ \u6539\u5584\u3055\u308c\u305f\u5b9f\u88c5\n    public class ImprovedImplementation\n    {\n        private readonly List&lt;LargeObject&gt; _cachedData;\n\n        \/\/ \u5fc5\u8981\u306a\u5834\u5408\u306e\u307f\u30c7\u30fc\u30bf\u3092\u30ad\u30e3\u30c3\u30b7\u30e5\n        public void ProcessData(IEnumerable&lt;LargeObject&gt; data)\n        {\n            \/\/ \u660e\u793a\u7684\u306b\u30ea\u30b9\u30c8\u306b\u5909\u63db\u3057\u3066\u30b9\u30b3\u30fc\u30d7\u3092\u5236\u9650\n            using var enumerator = data.GetEnumerator();\n            while (enumerator.MoveNext())\n            {\n                ProcessItem(enumerator.Current);\n            }\n        }\n\n        \/\/ \u5927\u304d\u306a\u30c7\u30fc\u30bf\u30bb\u30c3\u30c8\u306e\u51e6\u7406\n        public async Task ProcessLargeDataSet(IEnumerable&lt;LargeObject&gt; data)\n        {\n            const int batchSize = 1000;\n            var batch = new List&lt;LargeObject&gt;(batchSize);\n\n            foreach (var item in data)\n            {\n                batch.Add(item);\n\n                if (batch.Count &gt;= batchSize)\n                {\n                    await ProcessBatch(batch);\n                    batch.Clear();\n                }\n            }\n\n            if (batch.Any())\n            {\n                await ProcessBatch(batch);\n            }\n        }\n    }\n\n    \/\/ \u30ea\u30bd\u30fc\u30b9\u89e3\u653e\u3092\u78ba\u5b9f\u306b\u884c\u3046\u5b9f\u88c5\n    public class ResourceManagement : IDisposable\n    {\n        private bool _disposed;\n        private readonly IEnumerator&lt;LargeObject&gt; _enumerator;\n\n        public ResourceManagement(IEnumerable&lt;LargeObject&gt; data)\n        {\n            _enumerator = data.GetEnumerator();\n        }\n\n        public void ProcessNext()\n        {\n            if (_disposed)\n                throw new ObjectDisposedException(nameof(ResourceManagement));\n\n            if (_enumerator.MoveNext())\n            {\n                ProcessItem(_enumerator.Current);\n            }\n        }\n\n        public void Dispose()\n        {\n            if (!_disposed)\n            {\n                _enumerator.Dispose();\n                _disposed = true;\n            }\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u7121\u9650\u30eb\u30fc\u30d7\u3092\u9632\u3050\u305f\u3081\u306e\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>\u7121\u9650\u30eb\u30fc\u30d7\u3092\u9632\u3050\u305f\u3081\u306e\u5b89\u5168\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\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 InfiniteLoopPrevention\n{\n    \/\/ \u5b89\u5168\u306a\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u5b9f\u88c5\n    public static class SafeEnumeration\n    {\n        \/\/ \u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u4ed8\u304d\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\n        public static IEnumerable&lt;T&gt; WithTimeout&lt;T&gt;(\n            this IEnumerable&lt;T&gt; source,\n            TimeSpan timeout)\n        {\n            var startTime = DateTime.UtcNow;\n\n            foreach (var item in source)\n            {\n                if (DateTime.UtcNow - startTime &gt; timeout)\n                {\n                    throw new TimeoutException(\"Enumeration exceeded timeout\");\n                }\n\n                yield return item;\n            }\n        }\n\n        \/\/ \u6700\u5927\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u56de\u6570\u3092\u5236\u9650\n        public static IEnumerable&lt;T&gt; WithMaxIterations&lt;T&gt;(\n            this IEnumerable&lt;T&gt; source,\n            int maxIterations)\n        {\n            var count = 0;\n\n            foreach (var item in source)\n            {\n                if (count &gt;= maxIterations)\n                {\n                    throw new InvalidOperationException(\n                        \"Maximum iteration count exceeded\");\n                }\n\n                yield return item;\n                count++;\n            }\n        }\n\n        \/\/ \u7121\u9650\u30eb\u30fc\u30d7\u691c\u51fa\n        public static IEnumerable&lt;T&gt; WithCycleDetection&lt;T&gt;(\n            this IEnumerable&lt;T&gt; source,\n            IEqualityComparer&lt;T&gt; comparer = null)\n        {\n            comparer ??= EqualityComparer&lt;T&gt;.Default;\n            var seen = new HashSet&lt;T&gt;(comparer);\n\n            foreach (var item in source)\n            {\n                if (!seen.Add(item))\n                {\n                    throw new InvalidOperationException(\"Cycle detected\");\n                }\n\n                yield return item;\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\">\u4e3b\u306a\u554f\u984c\u70b9\u3068\u5bfe\u51e6\u6cd5<\/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\u30ea\u30fc\u30af\u5bfe\u7b56\n<ul class=\"wp-block-list\">\n<li>\u30a4\u30c6\u30ec\u30fc\u30bf\u30fc\u306e\u9069\u5207\u306a\u7834\u68c4<\/li>\n\n\n\n<li>\u30d0\u30c3\u30c1\u51e6\u7406\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30ad\u30e3\u30c3\u30b7\u30e5\u306e\u9069\u5207\u306a\u7ba1\u7406<\/li>\n\n\n\n<li>using\u30b9\u30c6\u30fc\u30c8\u30e1\u30f3\u30c8\u306e\u6d3b\u7528<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u7121\u9650\u30eb\u30fc\u30d7\u9632\u6b62\n<ul class=\"wp-block-list\">\n<li>\u30bf\u30a4\u30e0\u30a2\u30a6\u30c8\u306e\u8a2d\u5b9a<\/li>\n\n\n\n<li>\u6700\u5927\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u56de\u6570\u306e\u5236\u9650<\/li>\n\n\n\n<li>\u30b5\u30a4\u30af\u30eb\u691c\u51fa\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u7d42\u4e86\u6761\u4ef6\u306e\u8a2d\u5b9a<\/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>\u4e0d\u8981\u306a\u30a4\u30c6\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u56de\u907f<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30d0\u30c3\u30d5\u30a1\u30ea\u30f3\u30b0<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u306e\u52b9\u7387\u7684\u306a\u7ba1\u7406<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u9069\u5207\u306a\u5b9f\u88c5<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5bfe\u7b56\u3092\u9069\u5207\u306b\u5b9f\u88c5\u3059\u308b\u3053\u3068\u3067\u3001IEnumerable\u3092\u5b89\u5168\u304b\u3064\u52b9\u7387\u7684\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-19\">\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u3067\u306eIEnumerable\u306e\u53d6\u308a\u6271\u3044<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-20\">\u30e2\u30c3\u30af\u3092\u4f7f\u7528\u3057\u305f\u52b9\u679c\u7684\u306a\u30c6\u30b9\u30c8\u624b\u6cd5<\/h3>\n\n\n\n<p>IEnumerable\u3092\u4f7f\u7528\u3059\u308b\u30b3\u30fc\u30c9\u306e\u30c6\u30b9\u30c8\u3067\u306f\u3001\u9069\u5207\u306a\u30e2\u30c3\u30af\u306e\u4f5c\u6210\u304c\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=\"\">\/\/ \u30c6\u30b9\u30c8\u5bfe\u8c61\u306e\u30b5\u30fc\u30d3\u30b9\npublic interface IDataService\n{\n    IEnumerable&lt;Customer&gt; GetCustomers();\n}\n\npublic class CustomerProcessor\n{\n    private readonly IDataService _dataService;\n\n    public CustomerProcessor(IDataService dataService)\n    {\n        _dataService = dataService;\n    }\n\n    public IEnumerable&lt;Customer&gt; GetActiveCustomers()\n    {\n        return _dataService.GetCustomers()\n            .Where(c =&gt; c.IsActive);\n    }\n}\n\n\/\/ \u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\n[TestFixture]\npublic class CustomerProcessorTests\n{\n    private Mock&lt;IDataService&gt; _mockDataService;\n    private CustomerProcessor _processor;\n\n    [SetUp]\n    public void Setup()\n    {\n        _mockDataService = new Mock&lt;IDataService&gt;();\n        _processor = new CustomerProcessor(_mockDataService.Object);\n    }\n\n    [Test]\n    public void GetActiveCustomers_ReturnsOnlyActiveCustomers()\n    {\n        \/\/ Arrange\n        var testData = new List&lt;Customer&gt;\n        {\n            new Customer { Id = 1, IsActive = true },\n            new Customer { Id = 2, IsActive = false },\n            new Customer { Id = 3, IsActive = true }\n        };\n\n        _mockDataService\n            .Setup(s =&gt; s.GetCustomers())\n            .Returns(testData);\n\n        \/\/ Act\n        var result = _processor.GetActiveCustomers().ToList();\n\n        \/\/ Assert\n        Assert.That(result.Count, Is.EqualTo(2));\n        Assert.That(result.All(c =&gt; c.IsActive), Is.True);\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-21\">\u4e00\u822c\u7684\u306a\u30c6\u30b9\u30c8\u30b1\u30fc\u30b9\u3068\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u30d1\u30bf\u30fc\u30f3<\/h3>\n\n\n\n<p>IEnumerable\u306e\u30c6\u30b9\u30c8\u3067\u4f7f\u7528\u3059\u308b\u4e00\u822c\u7684\u306a\u30d1\u30bf\u30fc\u30f3\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=\"\">[TestFixture]\npublic class IEnumerableTestPatterns\n{\n    [Test]\n    public void TestSequenceEquality()\n    {\n        \/\/ Arrange\n        var expected = new[] { 1, 2, 3 };\n        var actual = GetNumbers();\n\n        \/\/ Assert\n        Assert.That(actual, Is.EqualTo(expected));\n    }\n\n    [Test]\n    public void TestSequenceOrder()\n    {\n        \/\/ Arrange\n        var numbers = new[] { 3, 1, 2 };\n        var orderedNumbers = OrderNumbers(numbers);\n\n        \/\/ Assert\n        Assert.That(orderedNumbers, Is.Ordered);\n    }\n\n    [Test]\n    public void TestCollectionProperties()\n    {\n        \/\/ Arrange\n        var numbers = GetNumbers();\n\n        \/\/ Assert\n        Assert.Multiple(() =&gt;\n        {\n            Assert.That(numbers, Is.Not.Empty);\n            Assert.That(numbers, Has.Exactly(3).Items);\n            Assert.That(numbers, Has.Member(1));\n            Assert.That(numbers, Is.Unique);\n        });\n    }\n\n    [Test]\n    public void TestLazyEvaluation()\n    {\n        \/\/ Arrange\n        var executionCount = 0;\n        IEnumerable&lt;int&gt; numbers = Enumerable.Range(1, 10)\n            .Select(n =&gt;\n            {\n                executionCount++;\n                return n;\n            });\n\n        \/\/ Act\n        var first = numbers.First();\n\n        \/\/ Assert\n        Assert.That(executionCount, Is.EqualTo(1));\n    }\n\n    [Test]\n    public void TestInfiniteSequence()\n    {\n        \/\/ Arrange\n        var infiniteSequence = GenerateInfiniteSequence();\n\n        \/\/ Act &amp; Assert\n        Assert.That(\n            () =&gt; infiniteSequence.ToList(),\n            Throws.TypeOf&lt;OutOfMemoryException&gt;());\n    }\n}\n\n\/\/ \u30c6\u30b9\u30c8\u30d8\u30eb\u30d1\u30fc\u30af\u30e9\u30b9\npublic class IEnumerableTestHelper\n{\n    \/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c6\u30b9\u30c8\u7528\u306e\u30d8\u30eb\u30d1\u30fc\u30e1\u30bd\u30c3\u30c9\n    public static void AssertPerformance&lt;T&gt;(\n        IEnumerable&lt;T&gt; sequence,\n        TimeSpan expectedMaxDuration)\n    {\n        var stopwatch = Stopwatch.StartNew();\n        var result = sequence.ToList();\n        stopwatch.Stop();\n\n        Assert.That(\n            stopwatch.Elapsed,\n            Is.LessThan(expectedMaxDuration),\n            $\"Operation took {stopwatch.Elapsed} which exceeds expected {expectedMaxDuration}\");\n    }\n\n    \/\/ \u30b7\u30fc\u30b1\u30f3\u30b9\u6bd4\u8f03\u7528\u306e\u30d8\u30eb\u30d1\u30fc\u30e1\u30bd\u30c3\u30c9\n    public static void AssertSequencesEqual&lt;T&gt;(\n        IEnumerable&lt;T&gt; expected,\n        IEnumerable&lt;T&gt; actual,\n        IEqualityComparer&lt;T&gt; comparer = null)\n    {\n        comparer ??= EqualityComparer&lt;T&gt;.Default;\n\n        using var expectedEnumerator = expected.GetEnumerator();\n        using var actualEnumerator = actual.GetEnumerator();\n\n        var index = 0;\n        while (true)\n        {\n            var hasExpected = expectedEnumerator.MoveNext();\n            var hasActual = actualEnumerator.MoveNext();\n\n            if (!hasExpected &amp;&amp; !hasActual)\n                return;\n\n            Assert.That(\n                hasExpected,\n                Is.EqualTo(hasActual),\n                $\"Sequences have different lengths at index {index}\");\n\n            Assert.That(\n                comparer.Equals(actualEnumerator.Current, expectedEnumerator.Current),\n                Is.True,\n                $\"Sequences differ at index {index}\");\n\n            index++;\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\">\u30c6\u30b9\u30c8\u5b9f\u88c5\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>\u30c6\u30b9\u30c8\u30d1\u30bf\u30fc\u30f3\n<ul class=\"wp-block-list\">\n<li>\u30b7\u30fc\u30b1\u30f3\u30b9\u306e\u7b49\u4fa1\u6027\u30c6\u30b9\u30c8<\/li>\n\n\n\n<li>\u9806\u5e8f\u306e\u30c6\u30b9\u30c8<\/li>\n\n\n\n<li>\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u30d7\u30ed\u30d1\u30c6\u30a3\u306e\u30c6\u30b9\u30c8<\/li>\n\n\n\n<li>\u9045\u5ef6\u8a55\u4fa1\u306e\u30c6\u30b9\u30c8<\/li>\n\n\n\n<li>\u7121\u9650\u30b7\u30fc\u30b1\u30f3\u30b9\u306e\u30c6\u30b9\u30c8<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30a2\u30b5\u30fc\u30b7\u30e7\u30f3\u30c6\u30af\u30cb\u30c3\u30af\n<ul class=\"wp-block-list\">\n<li>\u8907\u6570\u306e\u6761\u4ef6\u306e\u7d44\u307f\u5408\u308f\u305b<\/li>\n\n\n\n<li>\u30ab\u30b9\u30bf\u30e0\u30b3\u30f3\u30da\u30a2\u30e9\u30fc\u306e\u4f7f\u7528<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30c6\u30b9\u30c8<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u6761\u4ef6\u306e\u30c6\u30b9\u30c8<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u306e\u53ef\u8aad\u6027\u3068\u4fdd\u5b88\u6027\n<ul class=\"wp-block-list\">\n<li>\u660e\u78ba\u306a\u30c6\u30b9\u30c8\u540d<\/li>\n\n\n\n<li>Arrange-Act-Assert\u30d1\u30bf\u30fc\u30f3<\/li>\n\n\n\n<li>\u30d8\u30eb\u30d1\u30fc\u30e1\u30bd\u30c3\u30c9\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u30e2\u30c3\u30af\u306e\u4f7f\u7528<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u30d1\u30bf\u30fc\u30f3\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001IEnumerable\u3092\u4f7f\u7528\u3059\u308b\u30b3\u30fc\u30c9\u306e\u54c1\u8cea\u3092\u52b9\u679c\u7684\u306b\u78ba\u4fdd\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-22\">\u6b21\u306e\u30b9\u30c6\u30c3\u30d7\uff1a\u3088\u308a\u6df1\u3044C#\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u7ba1\u7406\u306e\u4e16\u754c\u3078<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-23\">IQueryable\u3068\u306e\u4f7f\u3044\u5206\u3051\u3067\u5b9f\u73fe\u3059\u308b\u6700\u9069\u5316<\/h3>\n\n\n\n<p>IEnumerable\u3068IQueryable\u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051\u306f\u3001\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306b\u5927\u304d\u306a\u5f71\u97ff\u3092\u4e0e\u3048\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 QueryableOptimization\n{\n    private readonly DbContext _context;\n\n    public QueryableOptimization(DbContext context)\n    {\n        _context = context;\n    }\n\n    \/\/ IQueryable\u3092\u4f7f\u7528\u3057\u305f\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\n    public IQueryable&lt;Customer&gt; GetCustomersByFilter(\n        string nameFilter = null,\n        bool? isActive = null)\n    {\n        var query = _context.Customers.AsQueryable();\n\n        if (!string.IsNullOrEmpty(nameFilter))\n        {\n            query = query.Where(c =&gt; c.Name.Contains(nameFilter));\n        }\n\n        if (isActive.HasValue)\n        {\n            query = query.Where(c =&gt; c.IsActive == isActive.Value);\n        }\n\n        return query; \/\/ \u30af\u30a8\u30ea\u306f\u307e\u3060\u5b9f\u884c\u3055\u308c\u3066\u3044\u306a\u3044\n    }\n\n    \/\/ IEnumerable\u3068IQueryable\u306e\u4f7f\u3044\u5206\u3051\n    public class QueryComparison\n    {\n        \/\/ \u30e1\u30e2\u30ea\u5185\u51e6\u7406\u306b\u9069\u3057\u305fIEnumerable\n        public static IEnumerable&lt;T&gt; ProcessInMemory&lt;T&gt;(\n            IEnumerable&lt;T&gt; items,\n            Func&lt;T, bool&gt; complexFilter)\n        {\n            return items\n                .Where(complexFilter)\n                .Select(item =&gt; ProcessItem(item));\n        }\n\n        \/\/ \u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u306b\u9069\u3057\u305fIQueryable\n        public static IQueryable&lt;T&gt; ProcessInDatabase&lt;T&gt;(\n            IQueryable&lt;T&gt; query,\n            Expression&lt;Func&lt;T, bool&gt;&gt; simpleFilter)\n        {\n            return query\n                .Where(simpleFilter)\n                .Select(item =&gt; item);\n        }\n    }\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-24\">\u975e\u540c\u671f\u30b9\u30c8\u30ea\u30fc\u30e0\u51e6\u7406\u3078\u306e\u767a\u5c55\u7684\u306a\u5fdc\u7528<\/h3>\n\n\n\n<p>C# 8.0\u3067\u5c0e\u5165\u3055\u308c\u305f\u975e\u540c\u671f\u30b9\u30c8\u30ea\u30fc\u30e0\u3092\u4f7f\u7528\u3057\u305f\u9ad8\u5ea6\u306a\u5b9f\u88c5\u4f8b\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 AsyncStreamProcessing\n{\n    \/\/ \u975e\u540c\u671f\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u57fa\u672c\u5b9f\u88c5\n    public static async IAsyncEnumerable&lt;T&gt; ProcessItemsAsync&lt;T&gt;(\n        IEnumerable&lt;T&gt; items)\n    {\n        foreach (var item in items)\n        {\n            await Task.Delay(100); \/\/ \u975e\u540c\u671f\u51e6\u7406\u306e\u30b7\u30df\u30e5\u30ec\u30fc\u30b7\u30e7\u30f3\n            yield return item;\n        }\n    }\n\n    \/\/ \u5b9f\u8df5\u7684\u306a\u975e\u540c\u671f\u30b9\u30c8\u30ea\u30fc\u30e0\u51e6\u7406\n    public class AsyncDataProcessor\n    {\n        \/\/ \u30d0\u30c3\u30c1\u51e6\u7406\u3068\u975e\u540c\u671f\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u7d44\u307f\u5408\u308f\u305b\n        public static async IAsyncEnumerable&lt;ProcessedData&gt; \n            ProcessLargeDataSetAsync(\n                IEnumerable&lt;RawData&gt; rawData,\n                int batchSize = 1000)\n        {\n            var batch = new List&lt;RawData&gt;(batchSize);\n\n            foreach (var item in rawData)\n            {\n                batch.Add(item);\n\n                if (batch.Count &gt;= batchSize)\n                {\n                    await foreach (var processed in ProcessBatchAsync(batch))\n                    {\n                        yield return processed;\n                    }\n                    batch.Clear();\n                }\n            }\n\n            if (batch.Any())\n            {\n                await foreach (var processed in ProcessBatchAsync(batch))\n                {\n                    yield return processed;\n                }\n            }\n        }\n\n        \/\/ \u30d1\u30e9\u30ec\u30eb\u51e6\u7406\u3068\u975e\u540c\u671f\u30b9\u30c8\u30ea\u30fc\u30e0\u306e\u7d44\u307f\u5408\u308f\u305b\n        public static async IAsyncEnumerable&lt;ProcessedData&gt; \n            ProcessWithParallelismAsync(\n                IEnumerable&lt;RawData&gt; rawData,\n                int maxParallelism = 3)\n        {\n            var semaphore = new SemaphoreSlim(maxParallelism);\n            var processingTasks = new List&lt;Task&lt;ProcessedData&gt;&gt;();\n\n            foreach (var item in rawData)\n            {\n                await semaphore.WaitAsync();\n\n                processingTasks.Add(Task.Run(async () =&gt;\n                {\n                    try\n                    {\n                        return await ProcessItemAsync(item);\n                    }\n                    finally\n                    {\n                        semaphore.Release();\n                    }\n                }));\n\n                \/\/ \u5b8c\u4e86\u3057\u305f\u30bf\u30b9\u30af\u306e\u7d50\u679c\u3092\u9806\u6b21yield\n                while (processingTasks.Any())\n                {\n                    var completed = await Task.WhenAny(processingTasks);\n                    processingTasks.Remove(completed);\n                    yield return await completed;\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\">\u767a\u5c55\u7684\u306a\u5b9f\u88c5\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>IQueryable\u306e\u6d3b\u7528\n<ul class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u30d9\u30fc\u30b9\u30af\u30a8\u30ea\u306e\u6700\u9069\u5316<\/li>\n\n\n\n<li>\u9045\u5ef6\u5b9f\u884c\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30af\u30a8\u30ea\u306e\u7d44\u307f\u7acb\u3066<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6700\u9069\u5316<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u975e\u540c\u671f\u30b9\u30c8\u30ea\u30fc\u30e0\u51e6\u7406\n<ul class=\"wp-block-list\">\n<li>IAsyncEnumerable\u306e\u6d3b\u7528<\/li>\n\n\n\n<li>\u30d0\u30c3\u30c1\u51e6\u7406\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/li>\n\n\n\n<li>\u30d1\u30e9\u30ec\u30eb\u51e6\u7406\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406\u306e\u6700\u9069\u5316<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u9ad8\u5ea6\u306a\u6700\u9069\u5316\u30c6\u30af\u30cb\u30c3\u30af\n<ul class=\"wp-block-list\">\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u5236\u5fa1<\/li>\n\n\n\n<li>\u30b9\u30b1\u30fc\u30e9\u30d3\u30ea\u30c6\u30a3\u306e\u78ba\u4fdd<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u30cf\u30f3\u30c9\u30ea\u30f3\u30b0<\/li>\n\n\n\n<li>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u30e2\u30cb\u30bf\u30ea\u30f3\u30b0<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div><\/div>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u767a\u5c55\u7684\u306a\u5b9f\u88c5\u3092\u7406\u89e3\u3057\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u52b9\u7387\u7684\u3067\u5805\u7262\u306a\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u958b\u767a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-25\">IEnumerable\u306e\u307e\u3068\u3081<\/h2>\n\n\n\n<p>IEnumerable\u306f\u5358\u306a\u308b\u30c7\u30fc\u30bf\u5217\u6319\u306e\u305f\u3081\u306e\u30a4\u30f3\u30bf\u30fc\u30d5\u30a7\u30fc\u30b9\u3067\u306f\u306a\u304f\u3001\u52b9\u7387\u7684\u306a\u30c7\u30fc\u30bf\u51e6\u7406\u3092\u5b9f\u73fe\u3059\u308b\u305f\u3081\u306e\u91cd\u8981\u306a\u57fa\u76e4\u3067\u3059\u3002<br>\u9045\u5ef6\u8a55\u4fa1\u3092\u7406\u89e3\u3057\u3001\u9069\u5207\u306a\u5b9f\u88c5\u30d1\u30bf\u30fc\u30f3\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u3001\u30e1\u30e2\u30ea\u52b9\u7387\u304c\u9ad8\u304f\u3001\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u826f\u3044\u30a2\u30d7\u30ea\u30b1\u30fc\u30b7\u30e7\u30f3\u3092\u958b\u767a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u307e\u305f\u3001\u9069\u5207\u306a\u30c6\u30b9\u30c8\u624b\u6cd5\u3092\u7d44\u307f\u5408\u308f\u305b\u308b\u3053\u3068\u3067\u3001\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u5b9f\u88c5\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\">\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><strong>\u9045\u5ef6\u8a55\u4fa1\u306e\u91cd\u8981\u6027<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u30c7\u30fc\u30bf\u306f\u5fc5\u8981\u306b\u306a\u3063\u305f\u6642\u70b9\u3067\u751f\u6210<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u4f7f\u7528\u91cf\u306e\u5927\u5e45\u306a\u524a\u6e1b\u304c\u53ef\u80fd<\/li>\n\n\n\n<li>\u4e0d\u8981\u306a\u51e6\u7406\u3092\u56de\u907f<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u6700\u9069\u5316<\/strong>\n<ul class=\"wp-block-list\">\n<li>ToList\u306e\u9069\u5207\u306a\u4f7f\u7528<\/li>\n\n\n\n<li>\u30e1\u30e2\u30ea\u30ea\u30fc\u30af\u306e\u9632\u6b62<\/li>\n\n\n\n<li>\u52b9\u7387\u7684\u306a\u30ad\u30e3\u30c3\u30b7\u30e5\u6226\u7565<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5b9f\u88c5\u306e\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u9069\u5207\u306a\u30ea\u30bd\u30fc\u30b9\u7ba1\u7406<\/li>\n\n\n\n<li>\u30a8\u30e9\u30fc\u51e6\u7406\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30c6\u30b9\u30c8\u306e\u91cd\u8981\u6027<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li><strong>\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u65b9\u6cd5<\/strong>\n<ul class=\"wp-block-list\">\n<li>\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406<\/li>\n\n\n\n<li>\u30d0\u30c3\u30c1\u51e6\u7406\u306e\u5b9f\u88c5<\/li>\n\n\n\n<li>\u30b9\u30c8\u30ea\u30fc\u30df\u30f3\u30b0\u51e6\u7406\u306e\u6700\u9069\u5316<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n<\/div><\/div>\n","protected":false},"excerpt":{"rendered":"<p>C#\u958b\u767a\u306b\u304a\u3044\u3066\u3001\u5927\u898f\u6a21\u30c7\u30fc\u30bf\u306e\u52b9\u7387\u7684\u306a\u51e6\u7406\u306f\u5e38\u306b\u8ab2\u984c\u3068\u306a\u308a\u307e\u3059\u3002IEnumerable\u306f\u3001\u3053\u306e\u8ab2\u984c\u306b\u5bfe\u3059\u308b\u5f37\u529b\u306a\u89e3\u6c7a\u7b56\u3092\u63d0\u4f9b\u3057\u307e\u3059\u3002\u7279\u306b\u9045\u5ef6\u8a55\u4fa1\u306e\u7279\u6027\u3092\u6d3b\u304b\u3059\u3053\u3068\u3067\u3001\u30e1\u30e2\u30ea\u52b9\u7387\u306e\u9ad8\u3044\u30c7\u30fc\u30bf\u51e6\u7406\u3092\u5b9f\u73fe\u3067\u304d\u307e\u3059\u3002\u672c\u8a18\u4e8b\u3067\u306f &#8230; 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