{"id":56519,"date":"2018-06-06T16:17:02","date_gmt":"2018-06-06T07:17:02","guid":{"rendered":"https:\/\/www.sejuku.net\/blog\/?p=56519"},"modified":"2024-05-06T11:48:18","modified_gmt":"2024-05-06T02:48:18","slug":"%e3%80%90c%e5%85%a5%e9%96%80%e3%80%91linq%e3%81%ae%e4%bd%bf%e3%81%84%e6%96%b9%e7%b7%8f%e3%81%be%e3%81%a8%e3%82%81select%e3%80%81where%e3%80%81groupby%e3%81%aa%e3%81%a9","status":"publish","type":"post","link":"https:\/\/www.sejuku.net\/blog\/56519","title":{"rendered":"\u3010C#\u5165\u9580\u3011LINQ\u306e\u4f7f\u3044\u65b9\u7dcf\u307e\u3068\u3081(Select\u3001Where\u3001GroupBy\u306a\u3069)"},"content":{"rendered":"<p>LINQ\u3063\u3066\u4f7f\u3063\u3066\u307e\u3059\u304b\uff1f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3092\u64cd\u4f5c\u3059\u308b\u5834\u5408\u306b\u3001\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3066\u4fbf\u5229\u3067\u3059\u3002<\/p>\n<p>\u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001LINQ\u306b\u3064\u3044\u3066<br \/>\n<div class=\"box01\"><\/p>\n<ul>\n<li><b>LINQ\u306b\u3064\u3044\u3066<\/b><\/li>\n<li><b>Select\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/b><\/li>\n<li><b>Group\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/b><\/li>\n<li><b>Count\u3001Max\u3001Sum\u3067\u96c6\u8a08\u3059\u308b\u65b9\u6cd5<\/b><\/li>\n<li><b>Any\u3001All\u3067\u8981\u7d20\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5<\/b><\/li>\n<li>LINQ to XML\u3067HTML\u3001XML\u306e\u89e3\u6790<\/li>\n<\/ul>\n<\/div>\n<p>\u306a\u3069\u57fa\u672c\u7684\u306a\u5185\u5bb9\u304b\u3089\u3001\u5fdc\u7528\u7684\u306a\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u3082\u89e3\u8aac\u3057\u3066\u3044\u304d\u307e\u3059\u3002\u4eca\u56de\u306fLINQ\u306b\u3064\u3044\u3066\u3001\u4f7f\u3044\u65b9\u3092\u308f\u304b\u308a\u3084\u3059\u304f\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<h2>LINQ\u306b\u3064\u3044\u3066<\/h2>\n<p>LINQ\u3068\u306f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3(\u914d\u5217\u3084List\u3001Dictionary\u306a\u3069)\u306e\u8981\u7d20\u3092\u51e6\u7406\u3059\u308b\u30e1\u30bd\u30c3\u30c9\u3092\u96c6\u3081\u305f\u30e9\u30a4\u30d6\u30e9\u30ea\u3067\u3059\u3002LINQ\u3092\u4f7f\u3046\u3068\u3001for\u6587\u3084foreach\u6587\u3092\u4f7f\u3063\u305f\u30eb\u30fc\u30d7\u51e6\u7406\u3092\u7c21\u6f54\u306b\u7f6e\u304d\u63db\u3048\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002LINQ\u3092\u4f7f\u3046\u305f\u3081\u306b\u306f\u3001using\u30c7\u30a3\u30ec\u30af\u30c6\u30a3\u30d6\u3092\u4f7f\u3063\u3066System.Linq\u3092\u53c2\u7167\u3059\u308b\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n<h3>\u30e9\u30e0\u30c0\u5f0f\u3068\u306f<\/h3>\n<p>LINQ\u3092\u4f7f\u3063\u3066\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u305f\u3081\u306b\u306f\u30e9\u30e0\u30c0\u5f0f\u3092\u4f7f\u3044\u307e\u3059\u3002\u30e9\u30e0\u30c0\u5f0f\u3068\u306f\u3001\u4e00\u8a00\u3067\u8a00\u3046\u3068\u300c<b>\u30e1\u30bd\u30c3\u30c9\u3092\u5909\u6570\u3068\u540c\u69d8\u306b\u6271\u3046\u8a18\u8ff0\u69d8\u5f0f<\/b>\u300d\u306b\u306a\u308a\u307e\u3059\u3002\u30e9\u30e0\u30c0\u5f0f\u306e\u57fa\u672c\u69cb\u6587\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u306a\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u5de6\u8fba =&gt; \u53f3\u8fba<\/pre>\n<p>\u30d1\u30e9\u30e1\u30fc\u30bf\u306f\u300c( )\u300d\u3067\u56f2\u3080\u5fc5\u8981\u304c\u3042\u308a\u307e\u3059\u304c\u3001\u5909\u6570\u304c1\u3064\u306e\u307f\u306e\u5834\u5408\u306f\u300c( )\u300d\u3092\u7701\u7565\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5909\u6570\u304c\u8907\u6570\u306e\u5834\u5408\u306f\u3001\u5404\u5909\u6570\u3092\u300c,\u300d(\u30ab\u30f3\u30de)\u3067\u533a\u5207\u308a\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">() =&gt; \u53f3\u8fba    \/\/ \u5909\u6570\u306a\u3057\u306e\u5834\u5408\r\nparam =&gt; \u53f3\u8fba    \/\/ \u5909\u6570\u304c1\u3064\u306e\u5834\u5408\r\n(param1, param2) =&gt; \u53f3\u8fba    \/\/ \u5909\u6570\u304c2\u3064\u306e\u5834\u5408<\/pre>\n<p>\u5909\u6570\u306e\u578b\u306f\u30b3\u30f3\u30d1\u30a4\u30e9\u306b\u3088\u3063\u3066\u81ea\u52d5\u7684\u306b\u63a8\u8ad6\u3055\u308c\u307e\u3059\u3002<\/p>\n<p>\u5fc5\u8981\u3067\u3042\u308c\u3070\u578b\u3092\u6307\u5b9a\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">(int param) =&gt; \u53f3\u8fba    \/\/ \u5909\u6570\u3092int\u578b\u3067\u6307\u5b9a<\/pre>\n<h2>Select\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/h2>\n<p>LINQ\u306eSelect\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u5168\u3066\u3092\u51e6\u7406\u3057\u3066\u5225\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u306b\u6e21\u3059\u3068\u304d\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002\u30e9\u30e0\u30c0\u5f0f\u306e\u53f3\u8fba\u306b\u51e6\u7406\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\nusing System.Linq;\r\n \r\nnamespace Sample\r\n{\r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      int[] src = {0, 1, 2, 3, 4, 5};\r\n      \r\n      var query = src.Select(x =&gt; x % 3);\r\n      Console.WriteLine(\"[{0}]\", string.Join(\", \", query));\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">[0, 1, 2, 0, 1, 2]<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001Select\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066int\u578b\u306e\u914d\u5217src\u306e\u8981\u7d20\u3092\u51e6\u7406\u3057\u3066\u3044\u307e\u3059\u3002\u8981\u7d20\u306e\u51e6\u7406\u3068\u3057\u3066\u30013\u3067\u5272\u3063\u305f\u4f59\u308a\u3092\u7b97\u51fa\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u306e\u3088\u3046\u306b\u3001for\u6587\u3084foreach\u6587\u3092\u4f7f\u3063\u3066\u8981\u7d20\u30921\u3064\u305a\u3064\u51e6\u7406\u3059\u308b\u5fc5\u8981\u304c\u306a\u304f\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>Where\u30aa\u30da\u30ec\u30fc\u30bf\u3068\u7d44\u307f\u5408\u308f\u305b\u3067\u4f7f\u3046\u65b9\u6cd5<\/h3>\n<p>Where\u30aa\u30da\u30ec\u30fc\u30bf\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u6761\u4ef6\u3092\u6e80\u8db3\u3059\u308b\u8981\u7d20\u306e\u307fSelect\u30e1\u30bd\u30c3\u30c9\u3067\u51e6\u7406\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002Where\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u306e\u5f15\u6570\u3082Select\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u3068\u540c\u3058\u3088\u3046\u306b\u30e9\u30e0\u30c0\u5f0f\u3067\u8a18\u8ff0\u3057\u307e\u3059\u3002\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\nusing System.Linq;\r\n \r\nnamespace Sample\r\n{\r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      int[] src = {0, 1, 2, 3, 4, 5};\r\n      \r\n      var query = src\r\n        .Where(x =&gt; x &gt; 1)\r\n        .Select(x =&gt; x % 3);\r\n      Console.WriteLine(\"[{0}]\", string.Join(\", \", query));\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">[2, 0, 1, 2]<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001Where\u30aa\u30da\u30ec\u30fc\u30b7\u30e7\u30f3\u3092\u4f7f\u3063\u3066\u914d\u5217src\u306e\u8981\u7d20\u304b\u30891\u3088\u308a\u5927\u304d\u306a\u8981\u7d20\u306e\u307fSelect\u30e1\u30bd\u30c3\u30c9\u3067\u51e6\u7406\u3092\u884c\u3063\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>foreach\u6587\u306e\u7f6e\u304d\u63db\u3048<\/h3>\n<p>Select\u30e1\u30bd\u30c3\u30c9\u3084Where\u30aa\u30da\u30ec\u30fc\u30bf\u3092\u4f7f\u3063\u305f\u8a18\u8ff0\u306b\u3064\u3044\u3066\u3054\u7d39\u4ecb\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u3053\u308c\u3092foreach\u6587\u3067\u66f8\u304f\u3068\u3069\u306e\u3088\u3046\u306b\u306a\u308b\u304b\u3054\u7d39\u4ecb\u3057\u3066\u304a\u304d\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\n \r\nnamespace Sample\r\n{\r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      int[] src = {0, 1, 2, 3, 4, 5};\r\n      \r\n      foreach(int num in src) {\r\n        if(num &gt; 1 &amp;&amp; num &lt; 5) {\r\n          int mod = num % 3;\r\n          Console.WriteLine(\"{0}\", mod);\r\n        }\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">2\r\n0\r\n1<\/pre>\n<p>LINQ\u306eSelect\u30e1\u30bd\u30c3\u30c9\u3084Where\u30aa\u30da\u30ec\u30fc\u30bf\u3092\u4f7f\u3046\u5834\u5408\u306b\u6bd4\u3079\u3066\u3084\u306f\u308a\u8a18\u8ff0\u306e\u624b\u9593\u304c\u5897\u3048\u3066\u3044\u307e\u3059\u306d\u3002<\/p>\n<h3>SelectMany\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/h3>\n<p>Select\u30e1\u30bd\u30c3\u30c9\u3068\u4f3c\u305f\u51e6\u7406\u3092\u884c\u3046SelectMany\u30e1\u30bd\u30c3\u30c9\u304c\u3042\u308a\u307e\u3059\u3002SelectMany\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u30681\u3064\u306e\u30b7\u30fc\u30b1\u30f3\u30b9\u306b\u5e73\u5766\u5316\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u5e73\u5766\u5316\u306b\u3064\u3044\u3066\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u4f7f\u3063\u3066\u89e3\u8aac\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\nusing System.Collections.Generic;\r\nusing System.Linq;\r\n \r\nnamespace Sample\r\n{\r\n  class Quarter\r\n  {\r\n    public string Period { get; set; }\r\n    public List&lt;String&gt; Months { get; set; }  \r\n  }\r\n  \r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      Quarter[] quarter = {\r\n        new Quarter{Period = \"1st\", Months = new List&lt;string&gt;{\"Jan\", \"Feb\", \"Mar\"}}, \r\n        new Quarter{Period = \"2nd\", Months = new List&lt;string&gt;{\"Apr\", \"May\", \"Jun\"}}, \r\n        new Quarter{Period = \"3rd\", Months = new List&lt;string&gt;{\"Jul\", \"Aug\", \"Sep\"}}, \r\n        new Quarter{Period = \"4th\", Months = new List&lt;string&gt;{\"Oct\", \"Nov\", \"Dec\"}}\r\n      };\r\n      \r\n      var query = quarter.SelectMany(x =&gt; x.Months);\r\n      Console.WriteLine(\"[{0}]\", string.Join(\", \", query));\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">[Jan, Feb, Mar, Apr, May, Jun, Jul, Aug, Sep, Oct, Nov, Dec]<\/pre>\n<p>SelectMany\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001\u914d\u5217quarter\u306e\u8981\u7d20\u5185\u306eList\u306e\u8981\u7d20\u3092\u5168\u3066\u53d6\u5f97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u3088\u3046\u306b\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u5185\u306e\u8981\u7d20\u3092\u5168\u3066\u540c\u3058\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u306b\u683c\u7d0d\u3059\u308b\u3053\u3068\u3092\u5e73\u5766\u5316\u3068\u8a00\u3044\u307e\u3059\u3002<\/p>\n<p>\u3053\u3053\u307e\u3067LINQ\u306eSelect\u30e1\u30bd\u30c3\u30c9\u3084Where\u30aa\u30da\u30ec\u30fc\u30bf\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u89e3\u8aac\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u3053\u3061\u3089\u3067\u306f\u3055\u3089\u306b\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/47172\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/03\/c_select-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010C#\u5165\u9580\u3011LINQ\u306eSelect\u3001Where\u3067\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u3092\u64cd\u4f5c\u3059\u308b\u65b9\u6cd5<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h2>GroupBy\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9<\/h2>\n<p>GroupBy\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3068\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3092\u30b0\u30eb\u30fc\u30d7\u306b\u5206\u985e\u3059\u308b\u5834\u5408\u306b\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3066\u4fbf\u5229\u3067\u3059\u3002GroupBy\u30e1\u30bd\u30c3\u30c9\u306f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u547c\u3073\u51fa\u3057\u3066\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002GroupBy\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u306f\u30e9\u30e0\u30c0\u5f0f\u3067\u30b0\u30eb\u30fc\u30d7\u5206\u3051\u306eKey\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>GroupBy\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\nusing System.Collections.Generic;\r\nusing System.Linq;\r\n \r\nnamespace Sample\r\n{\r\n  class Test {\r\n    public string Subj { get; set; }\r\n    public int Points { get; set; }\r\n    public string Name { get; set; }\r\n    public string ClassName { get; set; }\r\n  }\r\n  \r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      var result = new List&lt;Test&gt;() {\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 90, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 80, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 70, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 60, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 50, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 80, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 70, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 80, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 90, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n      };\r\n      \r\n      var query = result.GroupBy(x =&gt; x.Subj);\r\n      \r\n      foreach(var group in query) {\r\n        Console.WriteLine(group.Key);\r\n        foreach(var item in group) {\r\n          Console.WriteLine(\"{0}:{1}\u70b9\", item.Name, item.Points);\r\n        }\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u56fd\u8a9e\r\n\u7530\u4e2d\u3000\u4e00\u90ce:90\u70b9\r\n\u9234\u6728\u3000\u4e8c\u90ce:60\u70b9\r\n\u4f50\u85e4\u3000\u4e09\u90ce:70\u70b9\r\n\u6570\u5b66\r\n\u7530\u4e2d\u3000\u4e00\u90ce:80\u70b9\r\n\u9234\u6728\u3000\u4e8c\u90ce:50\u70b9\r\n\u4f50\u85e4\u3000\u4e09\u90ce:80\u70b9\r\n\u82f1\u8a9e\r\n\u7530\u4e2d\u3000\u4e00\u90ce:70\u70b9\r\n\u9234\u6728\u3000\u4e8c\u90ce:80\u70b9\r\n\u4f50\u85e4\u3000\u4e09\u90ce:90\u70b9<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001GroupBy\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066Test\u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u2015\u5909\u6570Subj\u306e\u5024\u3067\u30b0\u30eb\u30fc\u30d7\u5206\u3051\u3092\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>OrderBy\u30e1\u30bd\u30c3\u30c9\u3068\u306e\u7d44\u307f\u5408\u308f\u305b\u3067\u4f7f\u3046\u65b9\u6cd5<\/h3>\n<p>LINQ\u306eOrderBy\u30e1\u30bd\u30c3\u30c9\u306f\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3092\u4e26\u3073\u66ff\u3048\u308b\u5834\u5408\u306b\u4f7f\u7528\u3057\u307e\u3059\u3002OrderBy\u30e1\u30bd\u30c3\u30c9\u3082\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u30aa\u30d6\u30b8\u30a7\u30af\u30c8\u304b\u3089\u547c\u3073\u51fa\u3057\u3066\u4f7f\u3046\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002OrderBy\u30e1\u30bd\u30c3\u30c9\u306e\u5f15\u6570\u306b\u306f\u30e9\u30e0\u30c0\u5f0f\u3067\u4e26\u3073\u66ff\u3048\u306eKey\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n<p>\u6607\u9806\u306b\u4e26\u3073\u66ff\u3048\u308b\u5834\u5408\u306fOrderBy\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u3001\u964d\u9806\u306b\u4e26\u3073\u66ff\u3048\u308b\u5834\u5408\u306fOrderByDescending\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u7528\u3057\u307e\u3059\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\nusing System.Collections.Generic;\r\nusing System.Linq;\r\n \r\nnamespace Sample\r\n{\r\n  class Test {\r\n    public string Subj { get; set; }\r\n    public int Points { get; set; }\r\n    public string Name { get; set; }\r\n    public string ClassName { get; set; }\r\n  }\r\n  \r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      var result = new List&lt;Test&gt;() {\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 90, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 80, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 70, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 60, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 50, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 80, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 70, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 80, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 90, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n      };\r\n      \r\n      var query = result\r\n        .OrderByDescending(x =&gt; x.Points)\r\n        .GroupBy(x =&gt; x.Subj);\r\n      \r\n      foreach(var group in query) {\r\n        Console.WriteLine(group.Key);\r\n        foreach(var item in group) {\r\n          Console.WriteLine(\"{0}:{1}\u70b9\", item.Name, item.Points);\r\n        }\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u56fd\u8a9e\r\n\u7530\u4e2d\u3000\u4e00\u90ce:90\u70b9\r\n\u4f50\u85e4\u3000\u4e09\u90ce:70\u70b9\r\n\u9234\u6728\u3000\u4e8c\u90ce:60\u70b9\r\n\u82f1\u8a9e\r\n\u4f50\u85e4\u3000\u4e09\u90ce:90\u70b9\r\n\u9234\u6728\u3000\u4e8c\u90ce:80\u70b9\r\n\u7530\u4e2d\u3000\u4e00\u90ce:70\u70b9\r\n\u6570\u5b66\r\n\u7530\u4e2d\u3000\u4e00\u90ce:80\u70b9\r\n\u4f50\u85e4\u3000\u4e09\u90ce:80\u70b9\r\n\u9234\u6728\u3000\u4e8c\u90ce:50\u70b9<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001OrderByDescending\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066Test\u30af\u30e9\u30b9\u306e\u30e1\u30f3\u30d0\u5909\u6570Points\u306e\u5024\u3067\u964d\u9806\u306b\u4e26\u3073\u66ff\u3048\u3066\u3044\u307e\u3059\u3002\u3053\u3053\u307e\u3067LINQ\u306eGroupBy\u30e1\u30bd\u30c3\u30c9\u3001OrderBy\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u3066\u304d\u307e\u3057\u305f\u3002\u3053\u308c\u3089\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u306e\u3067\u3001\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/47220\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/03\/c_groupby-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010C#\u5165\u9580\u3011LINQ\u306eGroupBy\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b(OrderBy\u3082\u89e3\u8aac)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h2>Count\u3001Max\u3001Sum\u3067\u96c6\u8a08\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>Count\u3001Max\u3001Sum\u306a\u3069\u306e\u96c6\u8a08\u6f14\u7b97\u5b50\u3092\u4f7f\u3063\u3066\u30b0\u30eb\u30fc\u30d7\u5206\u3051\u3057\u305f\u7d50\u679c\u306e\u5024\u3092\u96c6\u8a08\u6f14\u7b97\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002\u96c6\u8a08\u6f14\u7b97\u5b50\u306b\u306f\u4ee5\u4e0b\u306e\u3088\u3046\u306b\u3044\u304f\u3064\u304b\u306e\u7a2e\u985e\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n\n<table id=\"tablepress-495\" class=\"tablepress tablepress-id-495\">\n<thead>\n<tr class=\"row-1\">\n\t<th class=\"column-1\">\u96c6\u8a08\u6f14\u7b97\u5b50<\/th><th class=\"column-2\">\u8aac\u660e<\/th>\n<\/tr>\n<\/thead>\n<tbody class=\"row-striping row-hover\">\n<tr class=\"row-2\">\n\t<td class=\"column-1\">Max<\/td><td class=\"column-2\">\u6700\u5927\u5024\u3092\u8fd4\u3059<\/td>\n<\/tr>\n<tr class=\"row-3\">\n\t<td class=\"column-1\">Min<\/td><td class=\"column-2\">\u6700\u5c0f\u5024\u3092\u8fd4\u3059<\/td>\n<\/tr>\n<tr class=\"row-4\">\n\t<td class=\"column-1\">Average<\/td><td class=\"column-2\">\u5e73\u5747\u5024\u3092\u8fd4\u3059<\/td>\n<\/tr>\n<tr class=\"row-5\">\n\t<td class=\"column-1\">Sum<\/td><td class=\"column-2\">\u5408\u8a08\u5024\u3092\u8fd4\u3059<\/td>\n<\/tr>\n<tr class=\"row-6\">\n\t<td class=\"column-1\">Count<\/td><td class=\"column-2\">\u8981\u7d20\u6570\u3092\u8fd4\u3059<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<!-- #tablepress-495 from cache -->\n<p>\u3053\u3053\u3067\u306f<b>Max\u306e\u4f7f\u3044\u65b9<\/b>\u306b\u3064\u3044\u3066\u3001\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\nusing System.Collections.Generic;\r\nusing System.Linq;\r\n\r\nnamespace Sample\r\n{\r\n  class Test {\r\n    public string Subj { get; set; }\r\n    public int Points { get; set; }\r\n    public string Name { get; set; }\r\n    public string ClassName { get; set; }\r\n  }\r\n  \r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      var result = new List&lt;Test&gt;() {\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 90, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 80, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 70, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 60, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 50, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 80, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 70, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 80, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 90, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n      };\r\n      \r\n      var query = result\r\n        .GroupBy(x =&gt; x.Subj)\r\n        .Select(x =&gt; new {Subj = x.Key, Max = x.Max(y =&gt; y.Points)});\r\n      \r\n      foreach(var group in query) {\r\n        Console.WriteLine(\"{0}\u306e\u6700\u9ad8\u70b9:{1}\u70b9\", group.Subj, group.Max);\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u56fd\u8a9e\u306e\u6700\u9ad8\u70b9:90\u70b9\r\n\u6570\u5b66\u306e\u6700\u9ad8\u70b9:80\u70b9\r\n\u82f1\u8a9e\u306e\u6700\u9ad8\u70b9:90\u70b9<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001\u96c6\u5408\u6f14\u7b97\u5b50Max\u3092\u4f7f\u3063\u3066\u5404\u6559\u79d1\u306e\u6700\u9ad8\u5f97\u70b9\u3092\u6f14\u7b97\u7b97\u51fa\u3057\u3066\u3044\u307e\u3059\u3002\u307e\u305f\u3001\u305d\u306e\u4ed6\u306e\u96c6\u8a08\u6f14\u7b97\u5b50Count\u3084Sum\u306e\u4f7f\u3044\u65b9\u306b\u3064\u3044\u3066\u306f\u3001\u3053\u3061\u3089\u3067\u8a73\u3057\u304f\u89e3\u8aac\u3057\u3066\u3044\u307e\u3059\u3002\u305c\u3072\u53c2\u8003\u306b\u3057\u3066\u304f\u3060\u3055\u3044\u3002<\/p>\n            <a href=\"https:\/\/www.sejuku.net\/blog\/47220\" class=\"blog-card-anchor\">\n                <div class=\"blog-card\">\n                <div class=\"blog-card-content\">\n                    <div class=\"blog-card-thumbnail\">\n                    <img decoding=\"async\" class=\"blog-card-thumbnail-img\" src=\"https:\/\/www.sejuku.net\/blog\/wp-content\/uploads\/2018\/03\/c_groupby-150x86.jpg\">\n                    <\/div>\n                    <div class=\"blog-card-title-wrap\">\n                    <div class=\"blog-card-title\">\u3010C#\u5165\u9580\u3011LINQ\u306eGroupBy\u3067\u30b0\u30eb\u30fc\u30d7\u5316\u3059\u308b(OrderBy\u3082\u89e3\u8aac)<\/div>\n                    <div class=\"blog-card-update-date\">\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n                    <\/div>\n                <\/div>\n                <\/div>\n            <\/a>\n            \n<h2>Any\u3001All\u3067\u8981\u7d20\u3092\u30c1\u30a7\u30c3\u30af\u3059\u308b\u65b9\u6cd5<\/h2>\n<p>LINQ\u306eAny\u30e1\u30bd\u30c3\u30c9\u3084All\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3068\u3001\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u304c\u6761\u4ef6\u3092\u6e80\u305f\u3057\u3066\u3044\u308b\u304b\u5224\u5b9a\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<h3>Any\u3067\u6761\u4ef6\u3092\u6e80\u305f\u3059\u8981\u7d20\u304c\u4e00\u3064\u3067\u3082\u3042\u308b\u304b\u30c1\u30a7\u30c3\u30af<\/h3>\n<p>Any\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3068\u3001\u6761\u4ef6\u3092\u6e80\u305f\u3059\u8981\u7d20\u304c\u4e00\u3064\u3067\u3082\u5b58\u5728\u3059\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\nusing System.Collections.Generic;\r\nusing System.Linq;\r\n\r\nnamespace Sample\r\n{\r\n  class Test {\r\n    public string Subj { get; set; }\r\n    public int Points { get; set; }\r\n    public string Name { get; set; }\r\n    public string ClassName { get; set; }\r\n  }\r\n  \r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      var result = new List&lt;Test&gt;() {\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 90, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 80, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 70, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 60, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 50, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 80, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 70, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 80, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 90, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n      };\r\n      \r\n      var query = result\r\n        .GroupBy(x =&gt; x.Subj)\r\n        .Select(x =&gt; new {Subj = x.Key, Bool = x.Any(y =&gt; y.Points &lt; 70)});\r\n      \r\n      foreach(var group in query) {\r\n        if(group.Bool) {\r\n          Console.WriteLine(\"{0}\u3067\u306f70\u70b9\u672a\u6e80\u304c\u3044\u307e\u3059\", group.Subj);\r\n        } else {\r\n          Console.WriteLine(\"{0}\u3067\u306f70\u70b9\u672a\u6e80\u306f\u3044\u307e\u305b\u3093\", group.Subj);\r\n        }\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u56fd\u8a9e\u3067\u306f70\u70b9\u672a\u6e80\u304c\u3044\u307e\u3059\r\n\u6570\u5b66\u3067\u306f70\u70b9\u672a\u6e80\u304c\u3044\u307e\u3059\r\n\u82f1\u8a9e\u3067\u306f70\u70b9\u672a\u6e80\u306f\u3044\u307e\u305b\u3093<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001Any\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u5404\u6559\u79d1\u306770\u70b9\u672a\u6e80\u304c\u5b58\u5728\u3059\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h3>All\u3067\u8981\u7d20\u5168\u3066\u304c\u6761\u4ef6\u3092\u6e80\u305f\u3059\u304b\u30c1\u30a7\u30c3\u30af<\/h3>\n<p>All\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u3068\u3001\u5168\u3066\u306e\u8981\u7d20\u304c\u6761\u4ef6\u3092\u6e80\u305f\u3059\u304b\u30c1\u30a7\u30c3\u30af\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u78ba\u8a8d\u3057\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\nusing System.Collections.Generic;\r\nusing System.Linq;\r\n\r\nnamespace Sample\r\n{\r\n  class Test {\r\n    public string Subj { get; set; }\r\n    public int Points { get; set; }\r\n    public string Name { get; set; }\r\n    public string ClassName { get; set; }\r\n  }\r\n  \r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      var result = new List&lt;Test&gt;() {\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 90, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 80, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 70, Name = \"\u7530\u4e2d\u3000\u4e00\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 60, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 50, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 80, Name = \"\u9234\u6728\u3000\u4e8c\u90ce\", ClassName = \"A\"},\r\n        new Test {Subj = \"\u56fd\u8a9e\", Points = 70, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n        new Test {Subj = \"\u6570\u5b66\", Points = 80, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n        new Test {Subj = \"\u82f1\u8a9e\", Points = 90, Name = \"\u4f50\u85e4\u3000\u4e09\u90ce\", ClassName = \"B\"},\r\n      };\r\n      \r\n      var query = result\r\n        .GroupBy(x =&gt; x.Subj)\r\n        .Select(x =&gt; new {Subj = x.Key, Bool = x.All(y =&gt; y.Points &gt;= 70)});\r\n      \r\n      foreach(var group in query) {\r\n        if(!group.Bool) {\r\n          Console.WriteLine(\"{0}\u3067\u306f70\u70b9\u672a\u6e80\u304c\u3044\u307e\u3059\", group.Subj);\r\n        } else {\r\n          Console.WriteLine(\"{0}\u3067\u306f70\u70b9\u672a\u6e80\u306f\u3044\u307e\u305b\u3093\", group.Subj);\r\n        }\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u56fd\u8a9e\u3067\u306f70\u70b9\u672a\u6e80\u304c\u3044\u307e\u3059\r\n\u6570\u5b66\u3067\u306f70\u70b9\u672a\u6e80\u304c\u3044\u307e\u3059\r\n\u82f1\u8a9e\u3067\u306f70\u70b9\u672a\u6e80\u306f\u3044\u307e\u305b\u3093<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001All\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u5404\u6559\u79d1\u306770\u70b9\u672a\u6e80\u304c\u5b58\u5728\u3059\u308b\u304b\u30c1\u30a7\u30c3\u30af\u3057\u3066\u3044\u307e\u3059\u3002<\/p>\n<h2>LINQ to XML\u3067HTML\u3001XML\u306e\u89e3\u6790<\/h2>\n<p>C#\u3067\u306fLINQ to XML\u3068\u3044\u3046\u6280\u8853\u3092\u4f7f\u3046\u3053\u3068\u3067\u3001HTML\u3084XML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u3092\u7c21\u5358\u306b\u89e3\u6790\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002<\/p>\n<p>\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3092\u4f7f\u3063\u3066\u78ba\u8a8d\u3057\u3066\u3044\u304d\u307e\u3057\u3087\u3046\u3002<\/p>\n<pre class=\"lang:c# decode:true \">using System;\r\nusing System.Linq;\r\nusing System.Xml.Linq;\r\n\r\nnamespace Sample\r\n{\r\n  class Sample\r\n  {\r\n    static void Main()\r\n    {\r\n      string xmlDoc = @\"&lt;?xml version='1.0'?&gt;\r\n                        &lt;names xmlns='https:\/\/www.sejuku.net\/example\/linqtoxml'&gt;\r\n                          &lt;name class='A'&gt;\u7530\u4e2d\u3000\u4e00\u90ce&lt;\/name&gt;\r\n                          &lt;name class='A'&gt;\u9234\u6728\u3000\u4e8c\u90ce&lt;\/name&gt;\r\n                          &lt;name class='B'&gt;\u4f50\u85e4\u3000\u4e09\u90ce&lt;\/name&gt;\r\n                        &lt;\/names&gt;\";\r\n      \r\n      var doc = XElement.Parse(xmlDoc);\r\n      XNamespace xns = \"https:\/\/www.sejuku.net\/example\/linqtoxml\";\r\n      \r\n      var query = from n in doc.Descendants(xns + \"name\")\r\n                    where n.Attribute(\"class\").Value.StartsWith(\"A\")\r\n                    select n;\r\n      \r\n      foreach(var group in query) {\r\n        Console.WriteLine(group.Value);\r\n      }\r\n      \r\n      Console.ReadKey();\r\n    }\r\n  }\r\n}<\/pre>\n<p>\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n<pre class=\"striped:false marking:false ranges:false nums:false nums-toggle:false lang:default decode:true \">\u7530\u4e2d\u3000\u4e00\u90ce\r\n\u9234\u6728\u3000\u4e8c\u90ce<\/pre>\n<p>\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001class\u5c5e\u6027\u306e\u5024\u304c\u300cA\u300d\u3067\u59cb\u307e\u308bname\u30bf\u30b0\u306e\u5185\u5bb9\u3092\u51fa\u529b\u3057\u3066\u3044\u307e\u3059\u3002\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306fXML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u89e3\u6790\u3092\u884c\u3044\u307e\u3057\u305f\u304c\u3001\u540c\u3058\u3088\u3046\u306b\u3057\u3066HTML\u30c9\u30ad\u30e5\u30e1\u30f3\u30c8\u306e\u89e3\u6790\u3082\u53ef\u80fd\u3067\u3059\u3002<\/p>\n<h2>\u307e\u3068\u3081<\/h2>\n<p>\u3053\u3053\u3067\u306fLINQ\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3057\u305f\u3002\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3092\u64cd\u4f5c\u3059\u308b\u5834\u5408\u306b\u3001\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3066\u4fbf\u5229\u3067\u3059\u3088\u306d\u3002<\/p>\n<p>\u4f7f\u3044\u3053\u306a\u3059\u3053\u3068\u304c\u3067\u304d\u308b\u3088\u3046\u306b\u3001\u3053\u306e\u8a18\u4e8b\u3092\u4f55\u5ea6\u3082\u53c2\u8003\u306b\u3057\u3066\u4e0b\u3055\u3044\u306d\uff01<\/p>\n","protected":false},"excerpt":{"rendered":"<p>LINQ\u3063\u3066\u4f7f\u3063\u3066\u307e\u3059\u304b\uff1f\u30b3\u30ec\u30af\u30b7\u30e7\u30f3\u306e\u8981\u7d20\u3092\u64cd\u4f5c\u3059\u308b\u5834\u5408\u306b\u3001\u7c21\u6f54\u306b\u8a18\u8ff0\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u3066\u4fbf\u5229\u3067\u3059\u3002 \u3053\u306e\u8a18\u4e8b\u3067\u306f\u3001LINQ\u306b\u3064\u3044\u3066 LINQ\u306b\u3064\u3044\u3066 Select\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9 Group\u30e1\u30bd\u30c3\u30c9\u306e\u4f7f\u3044\u65b9 Count\u3001 [&hellip;]<\/p>\n","protected":false},"author":4,"featured_media":56523,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"inline_featured_image":false,"swell_btn_cv_data":"","footnotes":""},"categories":[2334],"tags":[71,1416],"class_list":["post-56519","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-sharp-study","tag-c","tag-linq"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.3 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>\u3010C#\u5165\u9580\u3011LINQ\u306e\u4f7f\u3044\u65b9\u7dcf\u307e\u3068\u3081(Select\u3001Where\u3001GroupBy\u306a\u3069) | 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