{"id":1438,"date":"2024-12-05T18:04:26","date_gmt":"2024-12-05T09:04:26","guid":{"rendered":"https:\/\/dexall.co.jp\/articles\/?p=1438"},"modified":"2025-03-24T08:50:40","modified_gmt":"2025-03-23T23:50:40","slug":"c-3%e9%a0%85%e6%bc%94%e7%ae%97%e5%ad%90%e3%81%ae%e5%ae%8c%e5%85%a8%e3%82%ac%e3%82%a4%e3%83%89%ef%bc%9a%e6%ad%a3%e3%81%97%e3%81%84%e4%bd%bf%e3%81%84%e6%96%b9%e3%81%a8%e3%82%a2%e3%83%b3%e3%83%81","status":"publish","type":"post","link":"https:\/\/dexall.co.jp\/articles\/?p=1438","title":{"rendered":"C# 3\u9805\u6f14\u7b97\u5b50\u306e\u5b8c\u5168\u30ac\u30a4\u30c9\uff1a\u6b63\u3057\u3044\u4f7f\u3044\u65b9\u3068\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3092\u7406\u89e3\u3057\u3088\u3046"},"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\">3\u9805\u6f14\u7b97\u5b50\u3068\u306f\u4f55\u304b\uff1a\u57fa\u790e\u304b\u3089\u5b9f\u8df5\u307e\u3067<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-2\">3\u9805\u6f14\u7b97\u5b50\u306e\u57fa\u672c\u69cb\u6587\u3068\u52d5\u4f5c\u539f\u7406\u3092\u7406\u89e3\u3059\u308b<\/a>      <\/li>      <li>        <a href=\"#i-6\">3\u9805\u6f14\u7b97\u5b50\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u308b\u4ed5\u7d44\u307f<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-9\">3\u9805\u6f14\u7b97\u5b50\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-13\">3\u9805\u6f14\u7b97\u5b50\u306e\u30e1\u30ea\u30c3\u30c8\u3068\u9069\u5207\u306a\u4f7f\u7528\u30b7\u30fc\u30f3<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-14\">\u30b3\u30fc\u30c9\u306e\u7c21\u6f54\u6027\u3068\u53ef\u8aad\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-18\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u9762\u3067\u306e\u5229\u70b9\u3092\u6d3b\u304b\u3059\u65b9\u6cd5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-23\">3\u9805\u6f14\u7b97\u5b50\u306e\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-24\">\u6761\u4ef6\u4ed8\u304d\u5024\u306e\u5272\u308a\u5f53\u3066\u3092\u30a8\u30ec\u30ac\u30f3\u30c8\u306b\u51e6\u7406\u3059\u308b<\/a>      <\/li>      <li>        <a href=\"#i-27\">NULL\u30c1\u30a7\u30c3\u30af\u3067\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-30\">LINQ\u5185\u3067\u306e\u6d3b\u7528\u30c6\u30af\u30cb\u30c3\u30af<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-33\">3\u9805\u6f14\u7b97\u5b50\u306e\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3068\u6ce8\u610f\u70b9<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-34\">\u30cd\u30b9\u30c8\u3057\u305f3\u9805\u6f14\u7b97\u5b50\u3092\u907f\u3051\u308b\u3079\u304d\u7406\u7531<\/a>      <\/li>      <li>        <a href=\"#i-37\">\u8907\u96d1\u306a\u6761\u4ef6\u3067\u306e\u4f7f\u7528\u3092\u63a7\u3048\u308b\u3079\u304d\u30b1\u30fc\u30b9<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-40\">\u907f\u3051\u308b\u3079\u304d\u4e00\u822c\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u3068\u4ee3\u66ff\u624b\u6bb5<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-41\">if\u6587\u30683\u9805\u6f14\u7b97\u5b50\u306e\u4f7f\u3044\u5206\u3051<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-42\">\u30b3\u30fc\u30c9\u306e\u72b6\u6cc1\u306b\u5fdc\u3058\u305f\u9069\u5207\u306a\u9078\u629e\u65b9\u6cd5<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-45\">\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306e\u5408\u610f\u5f62\u6210\u3068\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04<\/a>      <\/li>    <\/ul>  <\/li>  <li>    <a href=\"#i-48\">3\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u305f\u30b3\u30fc\u30c9\u306e\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u4f8b<\/a>    <ul class=\"menu_level_1\">      <li class=\"first\">        <a href=\"#i-49\">\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3092\u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7\u3067\u6539\u5584\u3059\u308b<\/a>      <\/li>      <li>        <a href=\"#i-52\">\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u5f8c\u306e\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>      <li class=\"last\">        <a href=\"#i-56\">\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u5f8c\u306e\u78ba\u8a8d\u30dd\u30a4\u30f3\u30c8<\/a>      <\/li>    <\/ul>  <\/li>  <li class=\"last\">    <a href=\"#i-57\">3\u9805\u6f14\u7b97\u5b50\u306e\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u6cd5\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>C#\u306b\u304a\u3051\u308b3\u9805\u6f14\u7b97\u5b50\u306f\u3001\u6761\u4ef6\u5206\u5c90\u3092\u7c21\u6f54\u306b\u8a18\u8ff0\u3067\u304d\u308b\u5f37\u529b\u306a\u6a5f\u80fd\u3067\u3059\u3002\u3057\u304b\u3057\u3001\u305d\u306e\u4f7f\u3044\u65b9\u3092\u8aa4\u308b\u3068\u3001\u304b\u3048\u3063\u3066\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3092\u640d\u306a\u3046\u539f\u56e0\u3068\u306a\u308b\u3053\u3068\u3082\u3002\u672c\u8a18\u4e8b\u3067\u306f\u30013\u9805\u6f14\u7b97\u5b50\u306e\u57fa\u672c\u304b\u3089\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u65b9\u6cd5\u3001\u3055\u3089\u306b\u306f\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306e\u904b\u7528\u65b9\u91dd\u307e\u3067\u3001\u4f53\u7cfb\u7684\u306b\u89e3\u8aac\u3057\u3066\u3044\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\">3\u9805\u6f14\u7b97\u5b50\u306e\u57fa\u672c\u7684\u306a\u69cb\u6587\u3068\u52d5\u4f5c\u306e\u4ed5\u7d44\u307f<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u5177\u4f53\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">LINQ\u64cd\u4f5c\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u30c6\u30af\u30cb\u30c3\u30af<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u907f\u3051\u308b\u3079\u304d\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3068\u4ee3\u66ff\u624b\u6bb5<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">if\u6587\u3068\u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051\u65b9<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u5b9f\u8df5\u7684\u306a\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u4f8b<\/p>\n<\/div><\/div>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-1\">3\u9805\u6f14\u7b97\u5b50\u3068\u306f\u4f55\u304b\uff1a\u57fa\u790e\u304b\u3089\u5b9f\u8df5\u307e\u3067<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-2\">3\u9805\u6f14\u7b97\u5b50\u306e\u57fa\u672c\u69cb\u6587\u3068\u52d5\u4f5c\u539f\u7406\u3092\u7406\u89e3\u3059\u308b<\/h3>\n\n\n\n<p>3\u9805\u6f14\u7b97\u5b50\uff08\u6761\u4ef6\u6f14\u7b97\u5b50\u3068\u3082\u547c\u3070\u308c\u308b\uff09\u306f\u3001\u6761\u4ef6\u5f0f\u306b\u57fa\u3065\u3044\u30662\u3064\u306e\u5024\u306e\u3046\u3061\u3069\u3061\u3089\u304b\u3092\u8fd4\u3059\u6f14\u7b97\u5b50\u3067\u3059\u3002<br>\u4ee5\u4e0b\u306e\u57fa\u672c\u69cb\u6587\u3067\u4f7f\u7528\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-3\">\u57fa\u672c\u69cb\u6587<\/h4>\n\n\n\n<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"generic\" data-enlighter-theme=\"\" data-enlighter-highlight=\"\" data-enlighter-linenumbers=\"\" data-enlighter-lineoffset=\"\" data-enlighter-title=\"\" data-enlighter-group=\"\">\u6761\u4ef6\u5f0f ? \u771f\u306e\u5834\u5408\u306e\u5024 : \u507d\u306e\u5834\u5408\u306e\u5024<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-4\">\u57fa\u672c\u7684\u306a\u4f7f\u7528\u4f8b<\/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=\"\">int age = 20;\nstring status = age &gt;= 18 ? \"\u6210\u4eba\" : \"\u672a\u6210\u5e74\";\n\n\/\/ \u3053\u308c\u306f\u4ee5\u4e0b\u306eif\u6587\u3068\u540c\u3058\u52d5\u4f5c\u3067\u3059\nstring status;\nif (age &gt;= 18)\n{\n    status = \"\u6210\u4eba\";\n}\nelse\n{\n    status = \"\u672a\u6210\u5e74\";\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-5\">\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306eNULL\u5224\u5b9a<\/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=\"\">User user = null;\nstring userName = user?.Name ?? \"\u30b2\u30b9\u30c8\";\n\n\/\/ \u4e0a\u8a18\u306f\u4ee5\u4e0b\u306eif\u6587\u3068\u540c\u3058\u52d5\u4f5c\u3067\u3059\nstring userName;\nif (user != null &amp;&amp; user.Name != null)\n{\n    userName = user.Name;\n}\nelse\n{\n    userName = \"\u30b2\u30b9\u30c8\";\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-6\">3\u9805\u6f14\u7b97\u5b50\u304c\u30b3\u30f3\u30d1\u30a4\u30eb\u3055\u308c\u308b\u4ed5\u7d44\u307f<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-7\">\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306e\u5909\u63db<\/h4>\n\n\n\n<p>3\u9805\u6f14\u7b97\u5b50\u306f\u3001\u30b3\u30f3\u30d1\u30a4\u30eb\u6642\u306b\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u51e6\u7406\u306b\u5909\u63db\u3055\u308c\u307e\u3059\u3002<\/p>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u6761\u4ef6\u5f0f\u306e\u8a55\u4fa1<\/li>\n\n\n\n<li>\u8a55\u4fa1\u7d50\u679c\u306b\u57fa\u3065\u304f\u5206\u5c90\u51e6\u7406<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u5024\u306e\u8fd4\u5374<\/li>\n<\/ol>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-8\">\u4e2d\u9593\u8a00\u8a9e\u30ec\u30d9\u30eb\u3067\u306e\u52d5\u4f5c<\/h4>\n\n\n\n<p>\u4ee5\u4e0b\u306f\u5b9f\u969b\u306e\u4f8b\u3068IL\uff08\u4e2d\u9593\u8a00\u8a9e\uff09\u30ec\u30d9\u30eb\u3067\u306e\u52d5\u4f5c\u3092\u793a\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=\"\">\/\/ C#\u30b3\u30fc\u30c9\nint number = 10;\nstring result = number &gt; 0 ? \"\u6b63\u306e\u6570\" : \"0\u307e\u305f\u306f\u8ca0\u306e\u6570\";\n\n\/\/ \u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u3088\u3063\u3066\u751f\u6210\u3055\u308c\u308b\u64ec\u4f3c\u7684\u306aIL\u30b3\u30fc\u30c9\u306e\u30a4\u30e1\u30fc\u30b8\nIL_0000: ldc.i4.s    10          \/\/ number = 10 \u3092\u30b9\u30bf\u30c3\u30af\u306b\u30d7\u30c3\u30b7\u30e5\nIL_0002: stloc.0                 \/\/ number\u3092\u30ed\u30fc\u30ab\u30eb\u5909\u6570\u306b\u683c\u7d0d\nIL_0003: ldloc.0                 \/\/ number\u3092\u30b9\u30bf\u30c3\u30af\u306b\u30ed\u30fc\u30c9\nIL_0004: ldc.i4.0                \/\/ 0\u3092\u30b9\u30bf\u30c3\u30af\u306b\u30d7\u30c3\u30b7\u30e5\nIL_0005: bgt.s       IL_000A     \/\/ number &gt; 0 \u306e\u6bd4\u8f03\u3068\u30b8\u30e3\u30f3\u30d7\nIL_0007: ldstr       \"0\u307e\u305f\u306f\u8ca0\u306e\u6570\"\nIL_0009: br.s        IL_000F\nIL_000A: ldstr       \"\u6b63\u306e\u6570\"\nIL_000F: stloc.1                 \/\/ \u7d50\u679c\u3092result\u306b\u683c\u7d0d<\/pre>\n\n\n\n<p>\u3053\u306e\u6700\u9069\u5316\u3055\u308c\u305f\u4e2d\u9593\u30b3\u30fc\u30c9\u306b\u3088\u308a\u30013\u9805\u6f14\u7b97\u5b50\u306f\u901a\u5e38\u306eif-else\u6587\u3068\u540c\u7b49\u304b\u305d\u308c\u4ee5\u4e0a\u306e\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u3092\u767a\u63ee\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-9\">3\u9805\u6f14\u7b97\u5b50\u306e\u91cd\u8981\u306a\u30dd\u30a4\u30f3\u30c8<\/h3>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-10\">1. \u578b\u306e\u4e00\u81f4<\/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=\"\">\/\/ \u6b63\u3057\u3044\u4f7f\u7528\u4f8b\uff1a\u4e21\u65b9\u306e\u623b\u308a\u5024\u306e\u578b\u304c\u4e00\u81f4\nstring message = flag ? \"True\" : \"False\";\n\n\/\/ \u30b3\u30f3\u30d1\u30a4\u30eb\u30a8\u30e9\u30fc\uff1a\u578b\u304c\u4e00\u81f4\u3057\u3066\u3044\u306a\u3044\nstring result = flag ? \"\u6587\u5b57\u5217\" : 123; \/\/ \u30a8\u30e9\u30fc<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-11\">2. \u5f0f\u3068\u3057\u3066\u306e\u8a55\u4fa1<\/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=\"\">\/\/ 3\u9805\u6f14\u7b97\u5b50\u306f\u5f0f\u3068\u3057\u3066\u8a55\u4fa1\u3055\u308c\u308b\nvoid PrintStatus(int value) =&gt;\n    Console.WriteLine(value &gt; 0 ? \"\u6b63\u306e\u6570\u3067\u3059\" : \"0\u307e\u305f\u306f\u8ca0\u306e\u6570\u3067\u3059\");<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-12\">3. \u30e1\u30bd\u30c3\u30c9\u547c\u3073\u51fa\u3057\u3068\u306e\u7d44\u307f\u5408\u308f\u305b<\/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\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3092\u6761\u4ef6\u3068\u3057\u3066\u4f7f\u7528\nstring status = GetUserAge().HasValue ? \n    $\"\u5e74\u9f62: {GetUserAge().Value}\" : \n    \"\u5e74\u9f62\u304c\u672a\u8a2d\u5b9a\u3067\u3059\";<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u57fa\u672c\u3092\u7406\u89e3\u3059\u308b\u3053\u3068\u3067\u30013\u9805\u6f14\u7b97\u5b50\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3067\u304d\u308b\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<br>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5177\u4f53\u7684\u306a\u30e1\u30ea\u30c3\u30c8\u3068\u9069\u5207\u306a\u4f7f\u7528\u30b7\u30fc\u30f3\u306b\u3064\u3044\u3066\u8a73\u3057\u304f\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-13\">3\u9805\u6f14\u7b97\u5b50\u306e\u30e1\u30ea\u30c3\u30c8\u3068\u9069\u5207\u306a\u4f7f\u7528\u30b7\u30fc\u30f3<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-14\">\u30b3\u30fc\u30c9\u306e\u7c21\u6f54\u6027\u3068\u53ef\u8aad\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9<\/h3>\n\n\n\n<p>3\u9805\u6f14\u7b97\u5b50\u3092\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u54c1\u8cea\u3092\u5927\u304d\u304f\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u4ee5\u4e0b\u306b\u4e3b\u8981\u306a\u30e1\u30ea\u30c3\u30c8\u3068\u30d9\u30b9\u30c8\u30d7\u30e9\u30af\u30c6\u30a3\u30b9\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-15\">1. \u5358\u4e00\u884c\u3067\u306e\u5024\u306e\u5272\u308a\u5f53\u3066<\/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=\"\">\/\/ 3\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\nvar displayName = user.Name ?? user.Email ?? \"\u533f\u540d\u30e6\u30fc\u30b6\u30fc\";\n\n\/\/ if\u6587\u3092\u4f7f\u7528\u3057\u305f\u5834\u5408\nstring displayName;\nif (user.Name != null)\n{\n    displayName = user.Name;\n}\nelse if (user.Email != null)\n{\n    displayName = user.Email;\n}\nelse\n{\n    displayName = \"\u533f\u540d\u30e6\u30fc\u30b6\u30fc\";\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-16\">2. \u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u3068\u3057\u3066\u306e\u4f7f\u7528<\/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=\"\">\/\/ \u7c21\u6f54\u3067\u8aad\u307f\u3084\u3059\u3044\u5b9f\u88c5\npublic string GetUserStatus(User user) =&gt;\n    user.IsActive ? \"\u30a2\u30af\u30c6\u30a3\u30d6\" : \"\u975e\u30a2\u30af\u30c6\u30a3\u30d6\";\n\n\/\/ \u540c\u3058\u51e6\u7406\u3092if\u6587\u3067\u66f8\u3044\u305f\u5834\u5408\npublic string GetUserStatus(User user)\n{\n    if (user.IsActive)\n    {\n        return \"\u30a2\u30af\u30c6\u30a3\u30d6\";\n    }\n    return \"\u975e\u30a2\u30af\u30c6\u30a3\u30d6\";\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-17\">3. \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u521d\u671f\u5316\u6642\u306e\u6761\u4ef6\u4ed8\u304d\u5024\u8a2d\u5b9a<\/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=\"\">var user = new User\n{\n    Name = input.Name,\n    Role = string.IsNullOrEmpty(input.Role) ? \"\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\" : input.Role,\n    LastLoginDate = input.LastLogin ?? DateTime.Now\n};<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-18\">\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u9762\u3067\u306e\u5229\u70b9\u3092\u6d3b\u304b\u3059\u65b9\u6cd5<\/h3>\n\n\n\n<p>3\u9805\u6f14\u7b97\u5b50\u306f\u3001\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u9762\u3067\u3082\u5229\u70b9\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-19\">1. \u30e1\u30e2\u30ea\u52b9\u7387<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u5909\u6570\u306e\u8ffd\u52a0\u5ba3\u8a00\u304c\u4e0d\u8981<\/li>\n\n\n\n<li>\u30b9\u30bf\u30c3\u30af\u4e0a\u3067\u306e\u64cd\u4f5c\u304c\u6700\u9069\u5316\u3055\u308c\u308b<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-20\">2. \u5b9f\u884c\u6642\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/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=\"\">\/\/ \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u304c\u826f\u3044\u5b9f\u88c5\npublic decimal CalculateDiscount(decimal price) =&gt;\n    price &gt; 10000 ? price * 0.1m : price * 0.05m;\n\n\/\/ \u540c\u3058\u8a08\u7b97\u3092if\u6587\u3067\u884c\u3046\u5834\u5408\uff08\u3088\u308a\u591a\u304f\u306eIL\u547d\u4ee4\u304c\u751f\u6210\u3055\u308c\u308b\uff09\npublic decimal CalculateDiscount(decimal price)\n{\n    if (price &gt; 10000)\n    {\n        return price * 0.1m;\n    }\n    return price * 0.05m;\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-21\">3. \u6761\u4ef6\u5206\u5c90\u306e\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=\"\">\/\/ \u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u3088\u308b\u6700\u9069\u5316\u304c\u52b9\u304d\u3084\u3059\u3044\nvar status = isEnabled &amp;&amp; isValid ? Status.Active : Status.Inactive;<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-22\">\u9069\u5207\u306a\u4f7f\u7528\u30b7\u30fc\u30f3\u306e\u5224\u65ad\u57fa\u6e96<\/h4>\n\n\n<div id=\"id-10b8b42a-779a-4963-b974-8fbbe402bc55\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u4f7f\u7528\u3092\u63a8\u5968\u3059\u308b\u5834\u5408<\/th><th>\u907f\u3051\u308b\u3079\u304d\u5834\u5408<\/th><\/tr><\/thead><tbody><tr><td>\u5358\u7d14\u306a\u6761\u4ef6\u306b\u3088\u308b\u5024\u306e\u9078\u629e<\/td><td>\u8907\u96d1\u306a\u6761\u4ef6\u5206\u5c90<\/td><\/tr><tr><td>\u5358\u4e00\u306e\u5909\u6570\u3078\u306e\u4ee3\u5165<\/td><td>\u8907\u6570\u306e\u51e6\u7406\u304c\u5fc5\u8981\u306a\u5834\u5408<\/td><\/tr><tr><td>\u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024<\/td><td>\u9577\u3044\u51e6\u7406\u3084\u526f\u4f5c\u7528\u306e\u3042\u308b\u51e6\u7406<\/td><\/tr><tr><td>NULL\u30c1\u30a7\u30c3\u30af\u3068\u7d44\u307f\u5408\u308f\u305b\u305f\u521d\u671f\u5316<\/td><td>\u30cd\u30b9\u30c8\u3057\u305f\u6761\u4ef6\u5206\u5c90<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u4ee5\u4e0a\u306e\u30e1\u30ea\u30c3\u30c8\u3092\u6d3b\u304b\u3057\u3064\u3064\u3001\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u8aac\u660e\u3059\u308b\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u4f8b\u3092\u53c2\u8003\u306b\u3001\u9069\u5207\u306a\u5834\u9762\u30673\u9805\u6f14\u7b97\u5b50\u3092\u6d3b\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u54c1\u8cea\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-23\">3\u9805\u6f14\u7b97\u5b50\u306e\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-24\">\u6761\u4ef6\u4ed8\u304d\u5024\u306e\u5272\u308a\u5f53\u3066\u3092\u30a8\u30ec\u30ac\u30f3\u30c8\u306b\u51e6\u7406\u3059\u308b<\/h3>\n\n\n\n<p>\u5b9f\u52d9\u3067\u3088\u304f\u906d\u9047\u3059\u308b\u6761\u4ef6\u4ed8\u304d\u5024\u306e\u5272\u308a\u5f53\u3066\u30b7\u30ca\u30ea\u30aa\u306b\u304a\u3044\u3066\u30013\u9805\u6f14\u7b97\u5b50\u3092\u52b9\u679c\u7684\u306b\u6d3b\u7528\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-25\">1. \u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u3067\u306e\u6d3b\u7528<\/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=\"\">\/\/ \u4f1a\u54e1\u30b9\u30c6\u30fc\u30bf\u30b9\u306b\u5fdc\u3058\u305f\u30dd\u30a4\u30f3\u30c8\u4ed8\u4e0e\u7387\u306e\u8a08\u7b97\npublic decimal CalculatePointRate(Member member)\n{\n    \/\/ \u30b9\u30c6\u30fc\u30bf\u30b9\u306b\u5fdc\u3058\u3066\u7570\u306a\u308b\u30dd\u30a4\u30f3\u30c8\u7387\u3092\u8fd4\u3059\n    return member.Status switch\n    {\n        MemberStatus.Premium =&gt; 2.0m,\n        MemberStatus.Gold =&gt; 1.5m,\n        _ =&gt; 1.0m  \/\/ \u901a\u5e38\u4f1a\u54e1\u306e\u5834\u5408\n    };\n}\n\n\/\/ \u652f\u6255\u3044\u65b9\u6cd5\u306b\u3088\u308b\u624b\u6570\u6599\u8a08\u7b97\ndecimal CalculateFee(Order order) =&gt;\n    order.PaymentMethod == PaymentMethod.CreditCard \n        ? order.Amount * 0.03m \n        : order.Amount * 0.01m;<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-26\">2. UI\u8868\u793a\u306e\u5236\u5fa1<\/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=\"\">\/\/ \u30e6\u30fc\u30b6\u30fc\u306e\u6a29\u9650\u306b\u5fdc\u3058\u305f\u30dc\u30bf\u30f3\u8868\u793a\u30c6\u30ad\u30b9\u30c8\nstring buttonText = user.IsAdmin \n    ? \"\u7ba1\u7406\u8005\u3068\u3057\u3066\u7de8\u96c6\" \n    : user.CanEdit \n        ? \"\u7de8\u96c6\" \n        : \"\u95b2\u89a7\u306e\u307f\";\n\n\/\/ \u30b9\u30c6\u30fc\u30bf\u30b9\u306b\u5fdc\u3058\u305fCSS\u30af\u30e9\u30b9\u306e\u52d5\u7684\u5272\u308a\u5f53\u3066\nstring statusClass = item.Status == ItemStatus.Active\n    ? \"status-active\"\n    : \"status-inactive\";<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-27\">NULL\u30c1\u30a7\u30c3\u30af\u3067\u306e\u52b9\u679c\u7684\u306a\u4f7f\u7528\u65b9\u6cd5<\/h3>\n\n\n\n<p>NULL\u5024\u306e\u51e6\u7406\u306f\u65e5\u5e38\u7684\u306a\u958b\u767a\u30bf\u30b9\u30af\u3067\u3059\u304c\u30013\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u7c21\u6f54\u306b\u8a18\u8ff0\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-28\">1. \u57fa\u672c\u7684\u306aNULL\u30c1\u30a7\u30c3\u30af<\/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=\"\">\/\/ \u57fa\u672c\u7684\u306aNULL\u30c1\u30a7\u30c3\u30af\u3068\u4ee3\u66ff\u5024\u306e\u8a2d\u5b9a\npublic string GetDisplayName(User user)\n{\n    \/\/ null\u5408\u4f53\u6f14\u7b97\u5b50\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\n    return user?.Name ?? user?.Email ?? \"\u30b2\u30b9\u30c8\u30e6\u30fc\u30b6\u30fc\";\n}\n\n\/\/ \u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306e\u30d7\u30ed\u30d1\u30c6\u30a3\u3078\u306e\u5b89\u5168\u306a\u30a2\u30af\u30bb\u30b9\nstring GetCompanyName(Employee employee) =&gt;\n    employee?.Department?.Company?.Name ?? \"\u6240\u5c5e\u306a\u3057\";<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-29\">2. \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3067\u306eNULL\u30c1\u30a7\u30c3\u30af<\/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=\"\">\/\/ \u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306eNULL\u30c1\u30a7\u30c3\u30af\u3068\u7a7a\u30c1\u30a7\u30c3\u30af\npublic string GetFirstItemName(List&lt;Item&gt; items) =&gt;\n    items?.FirstOrDefault()?.Name ?? \"\u30a2\u30a4\u30c6\u30e0\u306a\u3057\";\n\n\/\/ \u914d\u5217\u8981\u7d20\u3078\u306e\u30a2\u30af\u30bb\u30b9\nstring GetCategoryName(string[] categories, int index) =&gt;\n    categories?.Length &gt; index ? categories[index] : \"\u672a\u5206\u985e\";<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-30\">LINQ\u5185\u3067\u306e\u6d3b\u7528\u30c6\u30af\u30cb\u30c3\u30af<\/h3>\n\n\n\n<p>LINQ\u30af\u30a8\u30ea\u5185\u3067\u306e3\u9805\u6f14\u7b97\u5b50\u306e\u6d3b\u7528\u306f\u3001\u7279\u306b\u5f37\u529b\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-31\">1. Select\u53e5\u3067\u306e\u6761\u4ef6\u4ed8\u304d\u30de\u30c3\u30d4\u30f3\u30b0<\/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=\"\">\/\/ \u5546\u54c1\u30ea\u30b9\u30c8\u306e\u8868\u793a\u7528\u30c7\u30fc\u30bf\u3078\u306e\u5909\u63db\nvar displayItems = products.Select(p =&gt; new DisplayItem\n{\n    Name = p.Name,\n    Price = p.IsOnSale ? p.SalePrice : p.RegularPrice,\n    Status = p.Stock &gt; 0 ? \"\u5728\u5eab\u3042\u308a\" : \"\u5728\u5eab\u5207\u308c\"\n});\n\n\/\/ \u30e6\u30fc\u30b6\u30fc\u30ea\u30b9\u30c8\u306e\u30d5\u30a3\u30eb\u30bf\u30ea\u30f3\u30b0\u3068\u5909\u63db\nvar userSummaries = users\n    .Where(u =&gt; u.IsActive)\n    .Select(u =&gt; new UserSummary\n    {\n        DisplayName = u.Name ?? u.Email,\n        Role = u.IsAdmin ? \"\u7ba1\u7406\u8005\" : \"\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\",\n        LastAccessDate = u.LastLogin ?? u.RegistrationDate\n    });<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-32\">2. GroupBy\u7d50\u679c\u306e\u51e6\u7406<\/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=\"\">\/\/ \u30b0\u30eb\u30fc\u30d7\u5316\u3055\u308c\u305f\u30c7\u30fc\u30bf\u306e\u96c6\u8a08\nvar categorySummary = products\n    .GroupBy(p =&gt; p.Category)\n    .Select(g =&gt; new CategorySummary\n    {\n        CategoryName = g.Key,\n        TotalValue = g.Sum(p =&gt; p.IsDiscounted \n            ? p.DiscountPrice \n            : p.RegularPrice),\n        Status = g.Any(p =&gt; p.Stock &gt; 0) \n            ? \"\u5728\u5eab\u3042\u308a\" \n            : \"\u5168\u54c1\u5207\u308c\"\n    });<\/pre>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u5b9f\u8df5\u4f8b\u306f\u3001\u5b9f\u969b\u306e\u958b\u767a\u73fe\u5834\u3067\u983b\u7e41\u306b\u906d\u9047\u3059\u308b\u72b6\u6cc1\u306b\u57fa\u3065\u3044\u3066\u3044\u307e\u3059\u3002<br>\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3068\u4fdd\u5b88\u6027\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u907f\u3051\u308b\u3079\u304d\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-33\">3\u9805\u6f14\u7b97\u5b50\u306e\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3068\u6ce8\u610f\u70b9<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-34\">\u30cd\u30b9\u30c8\u3057\u305f3\u9805\u6f14\u7b97\u5b50\u3092\u907f\u3051\u308b\u3079\u304d\u7406\u7531<\/h3>\n\n\n\n<p>\u30cd\u30b9\u30c8\u3057\u305f3\u9805\u6f14\u7b97\u5b50\u306f\u3001\u4e00\u898b\u7c21\u6f54\u306b\u898b\u3048\u307e\u3059\u304c\u3001\u591a\u304f\u306e\u554f\u984c\u3092\u5f15\u304d\u8d77\u3053\u3059\u53ef\u80fd\u6027\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-35\">1. \u53ef\u8aad\u6027\u306e\u4f4e\u4e0b<\/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=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u8907\u6570\u306e3\u9805\u6f14\u7b97\u5b50\u306e\u30cd\u30b9\u30c8\nstring GetUserLevel(User user) =&gt;\n    user.Score &gt; 1000 \n        ? user.IsPremium \n            ? \"\u30d7\u30ec\u30df\u30a2\u30e0\u30a8\u30ea\u30fc\u30c8\" \n            : \"\u30a8\u30ea\u30fc\u30c8\"\n        : user.Score &gt; 500 \n            ? \"\u30b4\u30fc\u30eb\u30c9\" \n            : \"\u30ec\u30ae\u30e5\u30e9\u30fc\";\n\n\/\/ \u63a8\u5968\u3055\u308c\u308b\u66f8\u304d\u65b9\uff1aswitch\u5f0f\u306e\u4f7f\u7528\nstring GetUserLevel(User user) =&gt;\n    user.Score switch\n    {\n        &gt; 1000 when user.IsPremium =&gt; \"\u30d7\u30ec\u30df\u30a2\u30e0\u30a8\u30ea\u30fc\u30c8\",\n        &gt; 1000 =&gt; \"\u30a8\u30ea\u30fc\u30c8\",\n        &gt; 500 =&gt; \"\u30b4\u30fc\u30eb\u30c9\",\n        _ =&gt; \"\u30ec\u30ae\u30e5\u30e9\u30fc\"\n    };<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-36\">2. \u30c7\u30d0\u30c3\u30b0\u306e\u56f0\u96e3\u3055<\/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=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u30c7\u30d0\u30c3\u30b0\u304c\u56f0\u96e3\u306a\u6761\u4ef6\u5206\u5c90\nvar result = condition1 \n    ? value1 \n    : condition2 \n        ? value2 \n        : condition3 \n            ? value3 \n            : defaultValue;\n\n\/\/ \u63a8\u5968\u3055\u308c\u308b\u66f8\u304d\u65b9\uff1aif-else\u307e\u305f\u306fswitch\u6587\u306e\u4f7f\u7528\nstring result;\nif (condition1)\n{\n    result = value1;\n}\nelse if (condition2)\n{\n    result = value2;\n}\nelse if (condition3)\n{\n    result = value3;\n}\nelse\n{\n    result = defaultValue;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-37\">\u8907\u96d1\u306a\u6761\u4ef6\u3067\u306e\u4f7f\u7528\u3092\u63a7\u3048\u308b\u3079\u304d\u30b1\u30fc\u30b9<\/h3>\n\n\n\n<p>\u4ee5\u4e0b\u306e\u3088\u3046\u306a\u72b6\u6cc1\u3067\u306f\u30013\u9805\u6f14\u7b97\u5b50\u306e\u4f7f\u7528\u3092\u907f\u3051\u308b\u3079\u304d\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-38\">1. \u8907\u96d1\u306a\u8ad6\u7406\u6761\u4ef6<\/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=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u8907\u96d1\u306a\u6761\u4ef6\u5f0f\nvar isValid = (user.Age &gt;= 18 &amp;&amp; user.HasValidId &amp;&amp; !user.IsBlocked) \n    ? true \n    : (user.HasSpecialPermission &amp;&amp; user.GuardianApproved) \n        ? true \n        : false;\n\n\/\/ \u63a8\u5968\u3055\u308c\u308b\u66f8\u304d\u65b9\uff1a\u6761\u4ef6\u3092\u5206\u5272\u3057\u3066\u660e\u78ba\u306b\u8868\u73fe\nbool IsValid(User user)\n{\n    if (user.Age &gt;= 18 &amp;&amp; user.HasValidId &amp;&amp; !user.IsBlocked)\n    {\n        return true;\n    }\n\n    if (user.HasSpecialPermission &amp;&amp; user.GuardianApproved)\n    {\n        return true;\n    }\n\n    return false;\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-39\">2. \u526f\u4f5c\u7528\u3092\u542b\u3080\u64cd\u4f5c<\/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=\"\">\/\/ \u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\uff1a\u526f\u4f5c\u7528\u3092\u542b\u30803\u9805\u6f14\u7b97\u5b50\u306e\u4f7f\u7528\nvar result = isValid \n    ? ProcessValidCase() &amp;&amp; UpdateDatabase() \n    : LogError() &amp;&amp; SendNotification();\n\n\/\/ \u63a8\u5968\u3055\u308c\u308b\u66f8\u304d\u65b9\uff1a\u660e\u793a\u7684\u306a\u5236\u5fa1\u30d5\u30ed\u30fc\nif (isValid)\n{\n    if (ProcessValidCase())\n    {\n        UpdateDatabase();\n    }\n}\nelse\n{\n    LogError();\n    SendNotification();\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-40\">\u907f\u3051\u308b\u3079\u304d\u4e00\u822c\u7684\u306a\u30d1\u30bf\u30fc\u30f3\u3068\u4ee3\u66ff\u624b\u6bb5<\/h3>\n\n\n<div id=\"id-70675627-6379-43be-a7b1-d29b42ee43c4\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3<\/th><th>\u554f\u984c\u70b9<\/th><th>\u63a8\u5968\u3055\u308c\u308b\u4ee3\u66ff\u624b\u6bb5<\/th><\/tr><\/thead><tbody><tr><td>\u591a\u91cd\u30cd\u30b9\u30c8<\/td><td>\u53ef\u8aad\u6027\u306e\u4f4e\u4e0b\u3001\u4fdd\u5b88\u6027\u306e\u60aa\u5316<\/td><td>switch\u5f0f\u3001if-else\u6587<\/td><\/tr><tr><td>\u8907\u96d1\u306a\u6761\u4ef6\u5f0f<\/td><td>\u30c7\u30d0\u30c3\u30b0\u56f0\u96e3\u3001\u30d0\u30b0\u306e\u6e29\u5e8a<\/td><td>\u6761\u4ef6\u306e\u5206\u5272\u3001\u30e1\u30bd\u30c3\u30c9\u5316<\/td><\/tr><tr><td>\u526f\u4f5c\u7528\u3092\u542b\u3080\u51e6\u7406<\/td><td>\u4e88\u671f\u305b\u306c\u52d5\u4f5c\u3001\u30c6\u30b9\u30c8\u56f0\u96e3<\/td><td>\u660e\u793a\u7684\u306a\u5236\u5fa1\u30d5\u30ed\u30fc<\/td><\/tr><tr><td>\u9577\u3044\u5f0f\u3084\u5024<\/td><td>\u30b3\u30fc\u30c9\u306e\u7406\u89e3\u304c\u56f0\u96e3<\/td><td>\u5909\u6570\u3078\u306e\u5206\u5272\u4ee3\u5165<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u3089\u306e\u30a2\u30f3\u30c1\u30d1\u30bf\u30fc\u30f3\u3092\u8a8d\u8b58\u3057\u3001\u9069\u5207\u306a\u4ee3\u66ff\u624b\u6bb5\u3092\u9078\u629e\u3059\u308b\u3053\u3068\u3067\u3001\u3088\u308a\u4fdd\u5b88\u6027\u306e\u9ad8\u3044\u30b3\u30fc\u30c9\u3092\u66f8\u304f\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<br>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001if\u6587\u30683\u9805\u6f14\u7b97\u5b50\u306e\u9069\u5207\u306a\u4f7f\u3044\u5206\u3051\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-41\">if\u6587\u30683\u9805\u6f14\u7b97\u5b50\u306e\u4f7f\u3044\u5206\u3051<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-42\">\u30b3\u30fc\u30c9\u306e\u72b6\u6cc1\u306b\u5fdc\u3058\u305f\u9069\u5207\u306a\u9078\u629e\u65b9\u6cd5<\/h3>\n\n\n\n<p>3\u9805\u6f14\u7b97\u5b50\u3068if\u6587\u306e\u9078\u629e\u306f\u3001\u30b3\u30fc\u30c9\u306e\u6587\u8108\u3084\u76ee\u7684\u306b\u5fdc\u3058\u3066\u9069\u5207\u306b\u5224\u65ad\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<br>\u4ee5\u4e0b\u306b\u3001\u5177\u4f53\u7684\u306a\u4f7f\u3044\u5206\u3051\u306e\u6307\u91dd\u3092\u793a\u3057\u307e\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-43\">3\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3059\u3079\u304d\u5834\u5408<\/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=\"\">\/\/ \u5358\u7d14\u306a\u6761\u4ef6\u306b\u3088\u308b\u5024\u306e\u4ee3\u5165\npublic string GetStatusText(bool isActive) =&gt;\n    isActive ? \"\u6709\u52b9\" : \"\u7121\u52b9\";\n\n\/\/ \u8a2d\u5b9a\u5024\u306e\u9078\u629e\nint timeout = isDevelopment ? 300 : 60;\n\n\/\/ \u30e1\u30bd\u30c3\u30c9\u306e\u623b\u308a\u5024\u306e\u6761\u4ef6\u5206\u5c90\npublic decimal CalculateShippingFee(Order order) =&gt;\n    order.TotalAmount &gt; 10000 ? 0m : 500m;\n\n\/\/ NULL\u30c1\u30a7\u30c3\u30af\u3092\u542b\u3080\u623b\u308a\u5024\npublic string GetUserName(User user) =&gt;\n    user?.Name ?? \"\u30b2\u30b9\u30c8\";<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-44\">if\u6587\u3092\u4f7f\u7528\u3059\u3079\u304d\u5834\u5408<\/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=\"\">\/\/ \u8907\u6570\u306e\u51e6\u7406\u304c\u5fc5\u8981\u306a\u5834\u5408\nif (user.IsAdmin)\n{\n    logger.LogInfo($\"\u7ba1\u7406\u8005{user.Name}\u304c\u30ed\u30b0\u30a4\u30f3\u3057\u307e\u3057\u305f\");\n    await NotifySecurityTeam(user);\n    return RedirectToAdminDashboard();\n}\nelse\n{\n    return RedirectToUserDashboard();\n}\n\n\/\/ \u6761\u4ef6\u304c\u8907\u96d1\u306a\u5834\u5408\nif (user.Age &gt;= 20 &amp;&amp; \n    user.HasValidId &amp;&amp; \n    !user.IsBlocked &amp;&amp; \n    user.EmailVerified)\n{\n    \/\/ \u51e6\u7406\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-45\">\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306e\u5408\u610f\u5f62\u6210\u3068\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04<\/h3>\n\n\n\n<p>\u30c1\u30fc\u30e0\u958b\u767a\u306b\u304a\u3044\u3066\u30013\u9805\u6f14\u7b97\u5b50\u306e\u4f7f\u7528\u306b\u95a2\u3059\u308b\u660e\u78ba\u306a\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3092\u8a2d\u3051\u308b\u3053\u3068\u304c\u91cd\u8981\u3067\u3059\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-46\">\u63a8\u5968\u3055\u308c\u308b\u30b3\u30fc\u30c7\u30a3\u30f3\u30b0\u898f\u7d04\u306e\u4f8b<\/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=\"\">\/\/ \u63a8\u5968\uff1a\u5358\u7d14\u306a\u6761\u4ef6\u306b\u3088\u308b\u5024\u306e\u4ee3\u5165\npublic class UserViewModel\n{\n    public string DisplayName { get; }\n    public string RoleText { get; }\n    public string StatusColor { get; }\n\n    public UserViewModel(User user)\n    {\n        \/\/ \u7c21\u6f54\u306a\u6761\u4ef6\u306b\u3088\u308b\u4ee3\u5165\u306f3\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\n        DisplayName = string.IsNullOrEmpty(user.Name) ? \"\u540d\u79f0\u672a\u8a2d\u5b9a\" : user.Name;\n        RoleText = user.IsAdmin ? \"\u7ba1\u7406\u8005\" : \"\u4e00\u822c\u30e6\u30fc\u30b6\u30fc\";\n        StatusColor = user.IsActive ? \"#28a745\" : \"#dc3545\";\n    }\n}\n\n\/\/ \u975e\u63a8\u5968\uff1a\u8907\u96d1\u306a\u6761\u4ef6\u3084\u51e6\u7406\u30923\u9805\u6f14\u7b97\u5b50\u3067\u8a18\u8ff0\npublic string GetComplexStatus(User user) =&gt;\n    user.IsAdmin \n        ? (user.LastLoginDate &gt; DateTime.Now.AddDays(-7) \n            ? \"\u30a2\u30af\u30c6\u30a3\u30d6\u7ba1\u7406\u8005\" \n            : \"\u975e\u30a2\u30af\u30c6\u30a3\u30d6\u7ba1\u7406\u8005\")\n        : (user.IsEmailVerified \n            ? \"\u8a8d\u8a3c\u6e08\u307f\u30e6\u30fc\u30b6\u30fc\" \n            : \"\u672a\u8a8d\u8a3c\u30e6\u30fc\u30b6\u30fc\");<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-47\">\u30c1\u30fc\u30e0\u898f\u7d04\u306e\u30dd\u30a4\u30f3\u30c8<\/h4>\n\n\n\n<ol class=\"wp-block-list\">\n<li>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u3067\u306e\u5224\u65ad\u57fa\u6e96\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u6761\u4ef6\u306e\u8907\u96d1\u3055<\/li>\n\n\n\n<li>\u51e6\u7406\u306e\u6570<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u306e\u884c\u6570<\/li>\n\n\n\n<li>\u30c7\u30d0\u30c3\u30b0\u306e\u3057\u3084\u3059\u3055<\/li>\n<\/ul>\n<\/li>\n\n\n\n<li>\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u5316\u3059\u3079\u304d\u9805\u76ee\n<ul class=\"wp-block-list is-style-sango-list-simple\">\n<li>\u4f7f\u7528\u53ef\u80fd\u306a\u5834\u9762\u306e\u5177\u4f53\u4f8b<\/li>\n\n\n\n<li>\u907f\u3051\u308b\u3079\u304d\u30d1\u30bf\u30fc\u30f3<\/li>\n\n\n\n<li>\u4f8b\u5916\u7684\u306b\u8a31\u5bb9\u3055\u308c\u308b\u30b1\u30fc\u30b9<\/li>\n\n\n\n<li>\u30ec\u30d3\u30e5\u30fc\u6642\u306e\u30c1\u30a7\u30c3\u30af\u30dd\u30a4\u30f3\u30c8<\/li>\n<\/ul>\n<\/li>\n<\/ol>\n\n\n\n<p>\u3053\u308c\u3089\u306e\u57fa\u6e96\u3092\u660e\u78ba\u306b\u3057\u3001\u30c1\u30fc\u30e0\u5185\u3067\u5171\u6709\u3059\u308b\u3053\u3068\u3067\u3001\u4e00\u8cab\u6027\u306e\u3042\u308b\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3092\u7dad\u6301\u3067\u304d\u307e\u3059\u3002<br>\u6b21\u306e\u30bb\u30af\u30b7\u30e7\u30f3\u3067\u306f\u3001\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u306e\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u4f8b\u3092\u898b\u3066\u3044\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-48\">3\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u305f\u30b3\u30fc\u30c9\u306e\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u4f8b<\/h2>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-49\">\u5b9f\u969b\u306e\u30b3\u30fc\u30c9\u3092\u30b9\u30c6\u30c3\u30d7\u30d0\u30a4\u30b9\u30c6\u30c3\u30d7\u3067\u6539\u5584\u3059\u308b<\/h3>\n\n\n\n<p>\u5b9f\u969b\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3088\u304f\u898b\u3089\u308c\u308b\u30b3\u30fc\u30c9\u30d1\u30bf\u30fc\u30f3\u3092\u4f8b\u306b\u30013\u9805\u6f14\u7b97\u5b50\u3092\u4f7f\u7528\u3057\u305f\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306e\u5177\u4f53\u4f8b\u3092\u898b\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-50\">1. \u5358\u7d14\u306a\u6761\u4ef6\u5206\u5c90\u306e\u6539\u5584<\/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=\"\">\/\/ \u5909\u66f4\u524d\npublic class OrderProcessor\n{\n    public decimal CalculateDiscount(Order order)\n    {\n        decimal discount;\n        if (order.TotalAmount &gt;= 10000)\n        {\n            discount = 1000;\n        }\n        else\n        {\n            discount = 0;\n        }\n        return discount;\n    }\n\n    public string GetOrderStatus(Order order)\n    {\n        string status;\n        if (order.IsPaid)\n        {\n            if (order.IsShipped)\n            {\n                status = \"\u914d\u9001\u6e08\u307f\";\n            }\n            else\n            {\n                status = \"\u652f\u6255\u3044\u6e08\u307f\";\n            }\n        }\n        else\n        {\n            status = \"\u672a\u6255\u3044\";\n        }\n        return status;\n    }\n}<\/pre>\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=\"\">\/\/ \u5909\u66f4\u5f8c\npublic class OrderProcessor\n{\n    public decimal CalculateDiscount(Order order) =&gt;\n        order.TotalAmount &gt;= 10000 ? 1000 : 0;\n\n    public string GetOrderStatus(Order order) =&gt;\n        !order.IsPaid ? \"\u672a\u6255\u3044\" :\n        order.IsShipped ? \"\u914d\u9001\u6e08\u307f\" : \"\u652f\u6255\u3044\u6e08\u307f\";\n}<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-51\">2. \u30d3\u30b8\u30cd\u30b9\u30ed\u30b8\u30c3\u30af\u306e\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=\"\">\/\/ \u5909\u66f4\u524d\npublic class UserService\n{\n    public string GetUserLevel(User user)\n    {\n        string level;\n        if (user.Points &gt;= 10000)\n        {\n            if (user.IsPremium)\n            {\n                level = \"\u30d7\u30ec\u30df\u30a2\u30e0\u30b4\u30fc\u30eb\u30c9\";\n            }\n            else\n            {\n                level = \"\u30b4\u30fc\u30eb\u30c9\";\n            }\n        }\n        else if (user.Points &gt;= 5000)\n        {\n            level = \"\u30b7\u30eb\u30d0\u30fc\";\n        }\n        else if (user.Points &gt;= 1000)\n        {\n            level = \"\u30d6\u30ed\u30f3\u30ba\";\n        }\n        else\n        {\n            level = \"\u901a\u5e38\u4f1a\u54e1\";\n        }\n        return level;\n    }\n\n    public bool CanAccessPremiumContent(User user)\n    {\n        bool canAccess;\n        if (user.IsPremium)\n        {\n            canAccess = true;\n        }\n        else if (user.Points &gt; 5000)\n        {\n            canAccess = true;\n        }\n        else\n        {\n            canAccess = false;\n        }\n        return canAccess;\n    }\n}<\/pre>\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=\"\">\/\/ \u5909\u66f4\u5f8c\npublic class UserService\n{\n    public string GetUserLevel(User user) =&gt;\n        user.Points switch\n        {\n            &gt;= 10000 when user.IsPremium =&gt; \"\u30d7\u30ec\u30df\u30a2\u30e0\u30b4\u30fc\u30eb\u30c9\",\n            &gt;= 10000 =&gt; \"\u30b4\u30fc\u30eb\u30c9\",\n            &gt;= 5000 =&gt; \"\u30b7\u30eb\u30d0\u30fc\",\n            &gt;= 1000 =&gt; \"\u30d6\u30ed\u30f3\u30ba\",\n            _ =&gt; \"\u901a\u5e38\u4f1a\u54e1\"\n        };\n\n    public bool CanAccessPremiumContent(User user) =&gt;\n        user.IsPremium || user.Points &gt; 5000;\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-52\">\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u5f8c\u306e\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u306e\u30dd\u30a4\u30f3\u30c8<\/h3>\n\n\n\n<p>\u30b3\u30fc\u30c9\u30ec\u30d3\u30e5\u30fc\u6642\u306b\u306f\u3001\u4ee5\u4e0b\u306e\u89b3\u70b9\u3067\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u306e\u54c1\u8cea\u3092\u8a55\u4fa1\u3057\u307e\u3059\uff1a<\/p>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-53\">1. \u53ef\u8aad\u6027\u306e\u5411\u4e0a<\/h4>\n\n\n\n<ul class=\"wp-block-list\">\n<li>\u6761\u4ef6\u5206\u5c90\u304c\u660e\u78ba\u306b\u306a\u3063\u3066\u3044\u308b\u304b<\/li>\n\n\n\n<li>\u30b3\u30fc\u30c9\u306e\u610f\u56f3\u304c\u7406\u89e3\u3057\u3084\u3059\u304f\u306a\u3063\u3066\u3044\u308b\u304b<\/li>\n\n\n\n<li>\u9069\u5207\u306a\u547d\u540d\u304c\u7dad\u6301\u3055\u308c\u3066\u3044\u308b\u304b<\/li>\n<\/ul>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-54\">2. \u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9\u306e\u6539\u5584<\/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=\"\">\/\/ \u6539\u5584\u524d\uff1a\u5197\u9577\u306a\u6761\u4ef6\u8a55\u4fa1\npublic decimal CalculateShippingFee(Order order)\n{\n    decimal fee;\n    if (order.IsPriority)\n    {\n        if (order.Weight &gt; 5)\n        {\n            fee = 2000;\n        }\n        else\n        {\n            fee = 1500;\n        }\n    }\n    else\n    {\n        if (order.Weight &gt; 5)\n        {\n            fee = 1000;\n        }\n        else\n        {\n            fee = 500;\n        }\n    }\n    return fee;\n}\n\n\/\/ \u6539\u5584\u5f8c\uff1a\u6761\u4ef6\u3092\u6574\u7406\u3057\u3066\u6700\u9069\u5316\npublic decimal CalculateShippingFee(Order order) =&gt;\n    (order.IsPriority, order.Weight &gt; 5) switch\n    {\n        (true, true) =&gt; 2000,\n        (true, false) =&gt; 1500,\n        (false, true) =&gt; 1000,\n        (false, false) =&gt; 500\n    };<\/pre>\n\n\n\n<h4 class=\"wp-block-heading\" id=\"i-55\">3. \u30c6\u30b9\u30bf\u30d3\u30ea\u30c6\u30a3\u306e\u78ba\u8a8d<\/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=\"\">\/\/ \u30c6\u30b9\u30c8\u304c\u5bb9\u6613\u306a\u30b3\u30fc\u30c9\u4f8b\npublic class PriceCalculator\n{\n    public decimal CalculateFinalPrice(Product product) =&gt;\n        product.IsDiscounted\n            ? ApplyDiscount(product.Price)\n            : product.Price;\n\n    private decimal ApplyDiscount(decimal price) =&gt;\n        price * 0.9m;\n}\n\n\/\/ \u30c6\u30b9\u30c8\u30b3\u30fc\u30c9\u4f8b\n[Fact]\npublic void CalculateFinalPrice_DiscountedProduct_Returns90Percent()\n{\n    var calculator = new PriceCalculator();\n    var product = new Product\n    {\n        Price = 1000,\n        IsDiscounted = true\n    };\n\n    var result = calculator.CalculateFinalPrice(product);\n\n    Assert.Equal(900, result);\n}<\/pre>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"i-56\">\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u5f8c\u306e\u78ba\u8a8d\u30dd\u30a4\u30f3\u30c8<\/h3>\n\n\n\n<p>\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u5f8c\u306e\u30b3\u30fc\u30c9\u306f\u3001\u4ee5\u4e0b\u306e\u6761\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u308b\u3079\u304d\u3067\u3059\u3002<\/p>\n\n\n<div id=\"id-8e58d743-96cb-4a4e-b9ff-8d399a19425c\">\n<figure class=\"wp-block-table\"><table class=\"has-fixed-layout\"><thead><tr><th>\u8a55\u4fa1\u9805\u76ee<\/th><th>\u78ba\u8a8d\u30dd\u30a4\u30f3\u30c8<\/th><\/tr><\/thead><tbody><tr><td>\u53ef\u8aad\u6027<\/td><td>\u6761\u4ef6\u306e\u610f\u56f3\u304c\u660e\u78ba\u304b<\/td><\/tr><tr><td>\u4fdd\u5b88\u6027<\/td><td>\u4fee\u6b63\u3084\u6a5f\u80fd\u8ffd\u52a0\u304c\u5bb9\u6613\u304b<\/td><\/tr><tr><td>\u30c6\u30b9\u30c8\u5bb9\u6613\u6027<\/td><td>\u30e6\u30cb\u30c3\u30c8\u30c6\u30b9\u30c8\u304c\u66f8\u304d\u3084\u3059\u3044\u304b<\/td><\/tr><tr><td>\u30d1\u30d5\u30a9\u30fc\u30de\u30f3\u30b9<\/td><td>\u4e0d\u8981\u306a\u51e6\u7406\u304c\u524a\u9664\u3055\u308c\u3066\u3044\u308b\u304b<\/td><\/tr><tr><td>\u30a8\u30e9\u30fc\u51e6\u7406<\/td><td>\u9069\u5207\u306a\u4f8b\u5916\u51e6\u7406\u304c\u7dad\u6301\u3055\u308c\u3066\u3044\u308b\u304b<\/td><\/tr><\/tbody><\/table><\/figure>\n<\/div>\n\n\n<p>\u3053\u308c\u3089\u306e\u4f8b\u3068\u30dd\u30a4\u30f3\u30c8\u3092\u53c2\u8003\u306b\u3001\u81ea\u8eab\u306e\u30d7\u30ed\u30b8\u30a7\u30af\u30c8\u3067\u3082\u9069\u5207\u306a\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3092\u884c\u3046\u3053\u3068\u3067\u3001\u30b3\u30fc\u30c9\u306e\u54c1\u8cea\u3092\u5411\u4e0a\u3055\u305b\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n\n\n\n<h2 class=\"wp-block-heading\" id=\"i-57\">3\u9805\u6f14\u7b97\u5b50\u306e\u5b9f\u8df5\u7684\u306a\u6d3b\u7528\u6cd5\u306e\u307e\u3068\u3081<\/h2>\n\n\n\n<p>3\u9805\u6f14\u7b97\u5b50\u306f\u3001\u9069\u5207\u306b\u4f7f\u7528\u3059\u308b\u3053\u3068\u3067\u30b3\u30fc\u30c9\u306e\u53ef\u8aad\u6027\u3068\u4fdd\u5b88\u6027\u3092\u5927\u304d\u304f\u5411\u4e0a\u3055\u305b\u308b\u6a5f\u80fd\u3067\u3059\u3002\u5358\u7d14\u306a\u6761\u4ef6\u5206\u5c90\u3067\u306e\u5024\u306e\u4ee3\u5165\u3084NULL\u30c1\u30a7\u30c3\u30af\u306a\u3069\u3001\u9069\u5207\u306a\u30b7\u30fc\u30f3\u3067\u6d3b\u7528\u3057\u306a\u304c\u3089\u3001\u8907\u96d1\u306a\u6761\u4ef6\u5206\u5c90\u3067\u306f\u5f93\u6765\u306eif\u6587\u3092\u9078\u629e\u3059\u308b\u306a\u3069\u3001\u72b6\u6cc1\u306b\u5fdc\u3058\u305f\u4f7f\u3044\u5206\u3051\u304c\u91cd\u8981\u3067\u3059\u3002\u30c1\u30fc\u30e0\u958b\u767a\u306b\u304a\u3044\u3066\u306f\u3001\u660e\u78ba\u306a\u30ac\u30a4\u30c9\u30e9\u30a4\u30f3\u3092\u8a2d\u3051\u308b\u3053\u3068\u3067\u3001\u4e00\u8cab\u6027\u306e\u3042\u308b\u30b3\u30fc\u30c9\u30d9\u30fc\u30b9\u3092\u7dad\u6301\u3059\u308b\u3053\u3068\u304c\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<p class=\"is-style-sango-paragraph-idea-alt\">3\u9805\u6f14\u7b97\u5b50\u306f\u5358\u7d14\u306a\u6761\u4ef6\u5206\u5c90\u306b\u6700\u9069<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u8907\u96d1\u306a\u6761\u4ef6\u3084\u8907\u6570\u306e\u51e6\u7406\u304c\u5fc5\u8981\u306a\u5834\u5408\u306fif\u6587\u3092\u9078\u629e<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">LINQ\u3084NULL\u30c1\u30a7\u30c3\u30af\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u771f\u4fa1\u3092\u767a\u63ee<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u30cd\u30b9\u30c8\u3057\u305f\u4f7f\u7528\u306f\u907f\u3051\u3001switch\u5f0f\u306a\u3069\u306e\u4ee3\u66ff\u624b\u6bb5\u3092\u691c\u8a0e<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u30c1\u30fc\u30e0\u958b\u767a\u3067\u306f\u660e\u78ba\u306a\u4f7f\u7528\u57fa\u6e96\u3092\u8a2d\u3051\u308b\u3053\u3068\u304c\u91cd\u8981<\/p>\n\n\n\n<p class=\"is-style-sango-paragraph-idea-alt\">\u30ea\u30d5\u30a1\u30af\u30bf\u30ea\u30f3\u30b0\u3092\u901a\u3058\u3066\u6bb5\u968e\u7684\u306a\u6539\u5584\u304c\u53ef\u80fd<\/p>\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; 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