\u3010C#\u5165\u9580\u3011LINQ\u306e\u4f7f\u3044\u65b9\u7dcf\u307e\u3068\u3081(Select\u3001Where\u3001GroupBy\u306a\u3069)<\/div>\n
\u66f4\u65b0\u65e5\uff1a2024\u5e745\u67086\u65e5<\/div>\n <\/div>\n <\/div>\n <\/div>\n <\/a>\n \n
DataTable\u306e\u30bd\u30fc\u30c8<\/h2>\n
DataTable\u30c7\u30fc\u30bf\u3092\u30bd\u30fc\u30c8\u3059\u308b\u3053\u3068\u3082\u3067\u304d\u307e\u3059\u3002\u3053\u308c\u3082Select\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u65b9\u6cd5\u3068LINQ\u3092\u4f7f\u3046\u65b9\u6cd5\u304c\u3042\u308a\u307e\u3059\u3002<\/p>\n
Select\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3046\u65b9\u6cd5<\/h3>\n
Select\u30e1\u30bd\u30c3\u30c9\u3067\u4e26\u3079\u66ff\u3048\u308b\u5834\u5408\u306f\u3001\u7b2c2\u5f15\u6570\u3067\u30bd\u30fc\u30c8\u6587\u5b57\u5217\u3092\u6307\u5b9a\u3057\u307e\u3059\u3002<\/p>\n
\u6607\u9806\u306e\u5834\u5408\u3001\u30bd\u30fc\u30c8\u6587\u5b57\u5217\u306b\u306f\u30ab\u30e9\u30e0\u540d\u3068ASC\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002\u964d\u9806\u306e\u5834\u5408\u3001\u30ab\u30e9\u30e0\u540d\u3068DESC\u3092\u8a18\u8ff0\u3057\u307e\u3059\u3002<\/p>\n
using System;\r\nusing System.Data;\r\n\r\nclass Program {\r\n static void Main(string[] args) {\r\n DataTable table = new DataTable(\"Table\");\r\n\r\n \/\/ \u30ab\u30e9\u30e0\u540d\u306e\u8ffd\u52a0\r\n table.Columns.Add(\"\u6559\u79d1\");\r\n table.Columns.Add(\"\u70b9\u6570\", Type.GetType(\"System.Int32\"));\r\n table.Columns.Add(\"\u6c0f\u540d\");\r\n table.Columns.Add(\"\u30af\u30e9\u30b9\u540d\");\r\n\r\n \/\/ Rows.Add\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\r\n table.Rows.Add(\"\u56fd\u8a9e\", 90, \"\u7530\u4e2d\u3000\u4e00\u90ce\", \"A\");\r\n table.Rows.Add(\"\u6570\u5b66\", 80, \"\u7530\u4e2d\u3000\u4e00\u90ce\", \"A\");\r\n table.Rows.Add(\"\u82f1\u8a9e\", 70, \"\u7530\u4e2d\u3000\u4e00\u90ce\", \"A\");\r\n table.Rows.Add(\"\u56fd\u8a9e\", 60, \"\u9234\u6728\u3000\u4e8c\u90ce\", \"A\");\r\n table.Rows.Add(\"\u6570\u5b66\", 50, \"\u9234\u6728\u3000\u4e8c\u90ce\", \"A\");\r\n table.Rows.Add(\"\u82f1\u8a9e\", 80, \"\u9234\u6728\u3000\u4e8c\u90ce\", \"A\");\r\n table.Rows.Add(\"\u56fd\u8a9e\", 70, \"\u4f50\u85e4\u3000\u4e09\u90ce\", \"B\");\r\n table.Rows.Add(\"\u6570\u5b66\", 80, \"\u4f50\u85e4\u3000\u4e09\u90ce\", \"B\");\r\n table.Rows.Add(\"\u82f1\u8a9e\", 90, \"\u4f50\u85e4\u3000\u4e09\u90ce\", \"B\");\r\n\r\n \/\/ Select\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30c7\u30fc\u30bf\u3092\u62bd\u51fa\r\n DataRow[] dRows = table.Select(\"\u6559\u79d1 = '\u56fd\u8a9e'\", \"\u70b9\u6570 DESC\");\r\n foreach (var row in dRows) {\r\n Console.WriteLine(\"\u70b9\u6570\uff1a{0}\u70b9\u3001\u6c0f\u540d\uff1a{1}\u3001\u30af\u30e9\u30b9\uff1a{2}\", row[1], row[2], row[3]);\r\n }\r\n }\r\n}<\/pre>\n\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
\u70b9\u6570\uff1a90\u70b9\u3001\u6c0f\u540d\uff1a\u7530\u4e2d\u3000\u4e00\u90ce\u3001\u30af\u30e9\u30b9\uff1aA\r\n\u70b9\u6570\uff1a70\u70b9\u3001\u6c0f\u540d\uff1a\u4f50\u85e4\u3000\u4e09\u90ce\u3001\u30af\u30e9\u30b9\uff1aB\r\n\u70b9\u6570\uff1a60\u70b9\u3001\u6c0f\u540d\uff1a\u9234\u6728\u3000\u4e8c\u90ce\u3001\u30af\u30e9\u30b9\uff1aA<\/pre>\n\u3053\u306e\u30b5\u30f3\u30d7\u30eb\u30b3\u30fc\u30c9\u3067\u306f\u3001\u70b9\u6570\u3067\u964d\u9806\u306b\u4e26\u3073\u66ff\u3048\u3066\u3044\u307e\u3059\u3002<\/p>\n
LINQ\u3092\u4f7f\u3046\u65b9\u6cd5<\/h3>\n
LINQ\u306eOrderBy\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3044\u4e26\u3073\u66ff\u3048\u307e\u3059\u3002<\/p>\n
\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
using System;\r\nusing System.Data;\r\n\r\nclass Program {\r\n static void Main(string[] args) {\r\n DataTable table = new DataTable(\"Table\");\r\n\r\n \/\/ \u30ab\u30e9\u30e0\u540d\u306e\u8ffd\u52a0\r\n table.Columns.Add(\"\u6559\u79d1\");\r\n table.Columns.Add(\"\u70b9\u6570\", Type.GetType(\"System.Int32\"));\r\n table.Columns.Add(\"\u6c0f\u540d\");\r\n table.Columns.Add(\"\u30af\u30e9\u30b9\u540d\");\r\n\r\n \/\/ Rows.Add\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\r\n table.Rows.Add(\"\u56fd\u8a9e\", 90, \"\u7530\u4e2d\u3000\u4e00\u90ce\", \"A\");\r\n table.Rows.Add(\"\u6570\u5b66\", 80, \"\u7530\u4e2d\u3000\u4e00\u90ce\", \"A\");\r\n table.Rows.Add(\"\u82f1\u8a9e\", 70, \"\u7530\u4e2d\u3000\u4e00\u90ce\", \"A\");\r\n table.Rows.Add(\"\u56fd\u8a9e\", 60, \"\u9234\u6728\u3000\u4e8c\u90ce\", \"A\");\r\n table.Rows.Add(\"\u6570\u5b66\", 50, \"\u9234\u6728\u3000\u4e8c\u90ce\", \"A\");\r\n table.Rows.Add(\"\u82f1\u8a9e\", 80, \"\u9234\u6728\u3000\u4e8c\u90ce\", \"A\");\r\n table.Rows.Add(\"\u56fd\u8a9e\", 70, \"\u4f50\u85e4\u3000\u4e09\u90ce\", \"B\");\r\n table.Rows.Add(\"\u6570\u5b66\", 80, \"\u4f50\u85e4\u3000\u4e09\u90ce\", \"B\");\r\n table.Rows.Add(\"\u82f1\u8a9e\", 90, \"\u4f50\u85e4\u3000\u4e09\u90ce\", \"B\");\r\n\r\n \/\/ LINQ\u3092\u4f7f\u3063\u3066\u30c7\u30fc\u30bf\u3092\u62bd\u51fa\r\n DataRow[] dRows = table.AsEnumerable()\r\n .Where(row => row.Field<string>(\"\u6559\u79d1\") == \"\u56fd\u8a9e\")\r\n .OrderByDescending(row => row.Field<int>(\"\u70b9\u6570\")).ToArray();\r\n foreach (var row in dRows) {\r\n Console.WriteLine(\"\u70b9\u6570\uff1a{0}\u70b9\u3001\u6c0f\u540d\uff1a{1}\u3001\u30af\u30e9\u30b9\uff1a{2}\", row[1], row[2], row[3]);\r\n }\r\n }\r\n}<\/pre>\n\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
\u70b9\u6570\uff1a90\u70b9\u3001\u6c0f\u540d\uff1a\u7530\u4e2d\u3000\u4e00\u90ce\u3001\u30af\u30e9\u30b9\uff1aA\r\n\u70b9\u6570\uff1a70\u70b9\u3001\u6c0f\u540d\uff1a\u4f50\u85e4\u3000\u4e09\u90ce\u3001\u30af\u30e9\u30b9\uff1aB\r\n\u70b9\u6570\uff1a60\u70b9\u3001\u6c0f\u540d\uff1a\u9234\u6728\u3000\u4e8c\u90ce\u3001\u30af\u30e9\u30b9\uff1aA<\/pre>\nCompute\u30e1\u30bd\u30c3\u30c9\u3067\u96c6\u8a08\u6f14\u7b97<\/h2>\n
DataTable\u30af\u30e9\u30b9\u306eCompute\u30e1\u30bd\u30c3\u30c9\u3067MAX\u3001MIN\u3001SUM\u3001AVE\u306e\u96c6\u8a08\u6f14\u7b97\u304c\u3067\u304d\u307e\u3059\u3002\u3053\u3053\u3067\u306f\u4ee3\u8868\u3057\u3066MAX\u3067\u96c6\u8a08\u6f14\u7b97\u3059\u308b\u5834\u5408\u306b\u3064\u3044\u3066\u3054\u7d39\u4ecb\u3057\u307e\u3059\u3002<\/p>\n
using System;\r\nusing System.Data;\r\n\r\nclass Program {\r\n static void Main(string[] args) {\r\n DataTable table = new DataTable(\"Table\");\r\n\r\n \/\/ \u30ab\u30e9\u30e0\u540d\u306e\u8ffd\u52a0\r\n table.Columns.Add(\"\u6559\u79d1\");\r\n table.Columns.Add(\"\u70b9\u6570\", Type.GetType(\"System.Int32\"));\r\n table.Columns.Add(\"\u6c0f\u540d\");\r\n table.Columns.Add(\"\u30af\u30e9\u30b9\u540d\");\r\n\r\n \/\/ Rows.Add\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u30c7\u30fc\u30bf\u3092\u8ffd\u52a0\r\n table.Rows.Add(\"\u56fd\u8a9e\", 90, \"\u7530\u4e2d\u3000\u4e00\u90ce\", \"A\");\r\n table.Rows.Add(\"\u6570\u5b66\", 80, \"\u7530\u4e2d\u3000\u4e00\u90ce\", \"A\");\r\n table.Rows.Add(\"\u82f1\u8a9e\", 70, \"\u7530\u4e2d\u3000\u4e00\u90ce\", \"A\");\r\n table.Rows.Add(\"\u56fd\u8a9e\", 60, \"\u9234\u6728\u3000\u4e8c\u90ce\", \"A\");\r\n table.Rows.Add(\"\u6570\u5b66\", 50, \"\u9234\u6728\u3000\u4e8c\u90ce\", \"A\");\r\n table.Rows.Add(\"\u82f1\u8a9e\", 80, \"\u9234\u6728\u3000\u4e8c\u90ce\", \"A\");\r\n table.Rows.Add(\"\u56fd\u8a9e\", 70, \"\u4f50\u85e4\u3000\u4e09\u90ce\", \"B\");\r\n table.Rows.Add(\"\u6570\u5b66\", 80, \"\u4f50\u85e4\u3000\u4e09\u90ce\", \"B\");\r\n table.Rows.Add(\"\u82f1\u8a9e\", 90, \"\u4f50\u85e4\u3000\u4e09\u90ce\", \"B\");\r\n\r\n \/\/ Compute\u30e1\u30bd\u30c3\u30c9\u3092\u4f7f\u3063\u3066\u96c6\u8a08\u6f14\u7b97\r\n object obj = table.Compute(\"Max(\u70b9\u6570)\", \"\u6559\u79d1 = '\u56fd\u8a9e'\");\r\n Console.WriteLine(\"\u56fd\u8a9e\u306e\u6700\u9ad8\u70b9\uff1a{0}\u70b9\", (int)obj);\r\n }\r\n}<\/pre>\n\u5b9f\u884c\u7d50\u679c\uff1a<\/p>\n
\u56fd\u8a9e\u306e\u6700\u9ad8\u70b9\uff1a90\u70b9<\/pre>\n\u307e\u3068\u3081<\/h2>\n
\u3053\u3053\u3067\u306f\u3001DataTable\u30af\u30e9\u30b9\u3067\u8868\u30c7\u30fc\u30bf\u3092\u6271\u3046\u65b9\u6cd5\u306b\u3064\u3044\u3066\u8aac\u660e\u3057\u307e\u3057\u305f\u3002GUI\u3067\u8868\u793a\u3057\u305f\u308a\u3001Select\u30e1\u30bd\u30c3\u30c9\u3084Compute\u30e1\u30bd\u30c3\u30c9\u3001LINQ\u3067\u64cd\u4f5c\u3059\u308b\u3053\u3068\u304c\u3067\u304d\u307e\u3059\u3002<\/p>\n
\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":"
DataTable\u3063\u3066\u4f7f\u3063\u3066\u307e\u3059\u304b\uff1f DataTable\u306f\u8868\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3092\u6271\u3046\u6642\u306b\u4f7f\u3044\u307e\u3059\u3002\u8868\u5f62\u5f0f\u306e\u30c7\u30fc\u30bf\u3092\u51e6\u7406\u3059\u308b\u305f\u3081\u306b\u3001Select\u30e1\u30bd\u30c3\u30c9\u3084Compute\u30e1\u30bd\u30c3\u30c9\u306a\u3069\u304c\u3042\u3089\u304b\u3058\u3081\u7528\u610f\u3055\u308c\u3066\u3044\u3066\u4fbf\u5229\u3067\u3059\u3002 \u3053\u306e\u8a18\u4e8b\u3067 […]<\/p>\n","protected":false},"author":4,"featured_media":58196,"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":[71,1463],"class_list":["post-58187","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-c-sharp-study","tag-c","tag-datatable"],"acf":[],"yoast_head":"\n
\u3010C#\u5165\u9580\u3011DataTable\u306e\u4f7f\u3044\u65b9(Select\u3001Sort\u3001Compute\u3001LINQ\u3082\u89e3\u8aac) | \u4f8d\u30a8\u30f3\u30b8\u30cb\u30a2\u30d6\u30ed\u30b0<\/title>\n<meta name=\"description\" content=\"\u3053\u306e\u8a18\u4e8b\u3067\u306f\u300c \u3010C#\u5165\u9580\u3011DataTable\u306e\u4f7f\u3044\u65b9(Select\u3001Sort\u3001Compute\u3001LINQ\u3082\u89e3\u8aac) \u300d\u306b\u3064\u3044\u3066\u3001\u8ab0\u3067\u3082\u7406\u89e3\u3067\u304d\u308b\u3088\u3046\u306b\u89e3\u8aac\u3057\u307e\u3059\u3002\u3053\u306e\u8a18\u4e8b\u3092\u8aad\u3081\u3070\u3001\u3042\u306a\u305f\u306e\u60a9\u307f\u304c\u89e3\u6c7a\u3059\u308b\u3060\u3051\u3058\u3083\u306a\u304f\u3001\u65b0\u305f\u306a\u6c17\u4ed8\u304d\u3082\u767a\u898b\u3067\u304d\u308b\u3053\u3068\u3067\u3057\u3087\u3046\u3002\u304a\u60a9\u307f\u306e\u65b9\u306f\u305c\u3072\u3054\u4e00\u8aad\u304f\u3060\u3055\u3044\u3002\" \/>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, 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