{"id":2154,"date":"2021-09-24T03:51:45","date_gmt":"2021-09-23T19:51:45","guid":{"rendered":"https:\/\/www.develop-note.com\/blog\/?p=2154"},"modified":"2022-02-16T17:52:24","modified_gmt":"2022-02-16T09:52:24","slug":"delegate-action-linq","status":"publish","type":"post","link":"https:\/\/www.develop-note.com\/blog\/2021\/09\/24\/delegate-action-linq\/","title":{"rendered":"D-21 \u59d4\u6d3e ? delegate ? Action ? Linq"},"content":{"rendered":"

\u7269\u4ef6\u5c0e\u5411\u4e4b\u5f8c\u5462<\/h1>\n

\u5c0f\u5149\u8ddf\u8457\u5927\u982d\u5f9e\u6700\u57fa\u790e\u7684\u57fa\u672c\u8a9e\u6cd5\u5b78\u7fd2\u5230\u65b9\u6cd5\u4ee5\u53ca\u7269\u4ef6\u5c0e\u5411\uff0c\u90a3\u63a5\u4e0b\u4f86\u8981\u600e\u9ebc\u8b93\u958b\u767c\u7684\u901f\u5ea6\u66f4\u5feb\u66f4\u4fbf\u6377\u5462\uff0c\u6240\u4ee5\u5927\u5bb6\u5c31\u63a5\u4e0b\u4f86\u770b\u770b\u672c\u7bc7\u6587\u7ae0\u5427\u3002<\/p>\n

<\/p>\n

\u59d4\u6d3e delegate<\/h2>\n

\u300c\u524d\u8f29\uff0c\u9664\u4e86\u7269\u4ef6\u5c0e\u5411\u4e4b\u5916\u9084\u6709\u751a\u9ebc\u65b9\u6cd5\u53ef\u4ee5\u8b93\u958b\u767c\u901f\u5ea6\u8b8a\u5feb\u7684\u963f\u3002\u300d
\n\u5c0f\u5149\u4e00\u65e9\u5c31\u8208\u6c96\u6c96\u7684\u8dd1\u4f86\u8ddf\u5927\u982d\u8acb\u6559\u95dc\u65bc\u958b\u767c\u7684\u65b9\u6cd5\uff0c\u4f46\u662f\u5927\u982d\u4eca\u5929\u4f3c\u4e4e\u684c\u4e0a\u7684\u9700\u6c42\u6587\u4ef6\u5806\u5f97\u7570\u5e38\u7684\u9ad8\uff0c\u4e0d\u904e\u5927\u982d\u904e\u4e86\u5e7e\u5206\u9418\u5f8c\u5c31\u62ac\u8d77\u982d\u4f86\u56de\u61c9\u5c0f\u5149\u7684\u554f\u984c\u3002
\n\u300c\u5176\u5be6\u9664\u4e86\u7269\u4ef6\u5c0e\u5411\u4e4b\u5916\u9084\u6709\u53e6\u5916\u4e00\u500b\u51fd\u5f0f\u8a9e\u8a00\u7a0b\u5f0f\u8a2d\u8a08<\/a>\u7684\u65b9\u6cd5\uff0c\u4ed6\u7684\u505a\u6cd5\u66f4\u7c21\u55ae\u4e0d\u6703\u8655\u7406\u5230\u7269\u4ef6\u4e4b\u9593\u7684\u95dc\u4fc2\uff0c\u6240\u4ee5\u6709\u53e6\u4e00\u500b\u9762\u5411\u7684\u52a0\u5feb\u958b\u767c\u901f\u5ea6\u7684\u65b9\u6cd5\u3002\u300d
\n\u807d\u5230\u53c8\u6709\u65b0\u7684\u6771\u897f\u53ef\u4ee5\u5b78\u8b93\u5c0f\u5149\u7684\u773c\u775b\u4e00\u6574\u500b\u4eae\u4e86\u8d77\u4f86\uff0c\u770b\u5230\u5c0f\u5149\u7684\u8868\u60c5\u5f8c\u5927\u982d\u7e7c\u7e8c\u6162\u6162\u7684\u8aaa\u4e0b\u53bb\u3002
\n\u300c\u9019\u500b\u51fd\u5f0f\u8a9e\u8a00\u7a0b\u5f0f\u8a2d\u8a08<\/a>\u7684\u6982\u5ff5\u8ddf\u6628\u5929\u5b78\u7684\u7269\u4ef6\u5c0e\u5411\u7684\u6982\u5ff5\u4e0d\u540c\u7684\u5730\u65b9\u662f\u5728\u51fd\u5f0f\u5167\u6c92\u6709\u72c0\u614b\u8207\u8cc7\u6599\u7684\u6982\u5ff5\uff0c\u6240\u4ee5\u5c0d\u65bc\u8655\u7406\u65b9\u6cd5\u6642\u53ea\u6709\u8f38\u5165\u8ddf\u8f38\u51fa\u800c\u5df2\uff0c\u800c\u4e14\u8f38\u5165\u7684\u5167\u5bb9\u76f8\u540c\u6642\u8f38\u51fa\u7684\u5167\u5bb9\u4e5f\u6703\u4e00\u81f4\u3002\u300d
\n\u8b1b\u5230\u4e86\u9019\u908a\uff0c\u5927\u982d\u62ff\u500b\u6c34\u676f\u559d\u4e86\u4e00\u5927\u53e3\u6c34\uff0c\u4e26\u63a5\u8457\u7e7c\u7e8c\u8b1b\u4e0b\u53bb\u3002
\n\u300c\u63d0\u5230C#\u5c0d\u65bc\u51fd\u5f0f\u8a9e\u8a00\u7a0b\u5f0f\u8a2d\u8a08<\/a>\u7684\u958b\u767c\u65b9\u5f0f\u5c31\u4e0d\u80fd\u4e0d\u63d0\u5230C#\u7684\u59d4\u6d3e<\/a>\u4e86\uff0c\u6240\u4ee5\u63a5\u4e0b\u4f86\u6211\u5148\u8aaa\u660e\u4e00\u4e0b\u5982\u4f55\u4f7f\u7528\u59d4\u6d3e<\/a>\u3002\u300d<\/p>\n

delegate<\/h3>\n

\u6628\u5929\u63d0\u5230\u7684ReferenceType\u9664\u4e86class\u4e4b\u5916\u9084\u6709\u53e6\u4e00\u500b\u5c31\u662fdelegate\uff0c\u6240\u8b02\u7684delegate\u7c21\u55ae\u8aaa\u660e\u5c31\u662f\u5ba3\u544a\u4e00\u500b\u7279\u5b9a\u8f38\u5165\u7684\u53c3\u6578\u4ee5\u53ca\u8fd4\u9084\u7684\u7d50\u679c\uff0c\u7136\u5f8c\u63a5\u4e0b\u4f86\u7528\u9019\u500bdelegate\u5ba3\u544a\u7684\u8b8a\u6578\u5c31\u53ef\u4ee5\u627f\u63a5\u8207\u6b64delegate\u7c3d\u7ae0\u76f8\u7b26\u4ee5\u53ca\u8fd4\u9084\u503c\u76f8\u540c\u7684\u65b9\u6cd5\uff0c\u4e26\u4e14\u5728\u65b9\u6cd5\u4e2d\u4f7f\u7528\uff0c\u6240\u4ee5\u5be6\u969b\u7684\u4f8b\u5b50\u53ef\u4ee5\u770b\u4ee5\u4e0b\u7bc4\u4f8b\u3002<\/p>\n

\/\/ \u5ba3\u544a\u4e00\u500b\u59d4\u6d3e\npublic delegate void DoSomethingDelegate(string message);\n\n\/\/ \u5be6\u4f5c\npublic void Print(string message)\n{\n    Console.WriteLine(message);\n}\n\n\/\/ \u5ba3\u544a\u500b\u8b8a\u6578\u653e\u5be6\u4f5c\u7684\u65b9\u6cd5\nDoSomethingDelegate handler = Print;\n\n\/\/ \u547c\u53eb\u57f7\u884c\u8a72\u8b8a\u6578\nhandler("Hello World!"); <\/code><\/pre>\n
\u597d\u7684\uff0c\u4e0a\u8ff0\u4f8b\u5b50\u5c31\u662f\u7c21\u55ae\u7684\u59d4\u6d3e\u5ba3\u544a\u5230\u4f7f\u7528\uff0c\u9664\u4e86\u53ef\u4ee5\u5982\u6b64\u4f7f\u7528\u4e4b\u5916\u525b\u525b\u63d0\u5230\u59d4\u6d3e\u662f\u500bReferenceType\u7684\u8b8a\u6578\uff0c\u56e0\u6b64\u4ed6\u4e5f\u53ef\u4ee5\u7576\u4f5c\u4e00\u500b\u8b8a\u6578\u50b3\u5230\u65b9\u6cd5\u5167\uff0c\u6240\u4ee5\u5927\u5bb6\u518d\u770b\u770b\u4e0b\u5217\u4f8b\u5b50\u3002<\/p>\n
\/\/ \u63a5\u7e8c\u4e0a\u9762\u4f8b\u5b50\npublic void Add(int a, int b, DoSomethingDelegate handle)\n{\n    handle($"result: {a + b}");\n}<\/code><\/pre>\n
\u96d6\u7136\u59d4\u6d3e\u597d\u7528\u4e0d\u904e\u8981\u5148\u5ba3\u544a\u4e00\u500b\u578b\u5225\u5f88\u9ebb\u7169\u800c\u4e14\u5f88\u7d2f\u8d05\uff0c\u6240\u4ee5\u5728\u5f8c\u7e8c\u53c8\u6709Action\u3001func\u3001Predicate\u7684\u7522\u751f\uff0c\u6240\u4ee5\u63a5\u4e0b\u4f86\u4f9d\u5e8f\u8aaa\u660e\u3002<\/p>\n
Action<\/h3>\n
Action<\/a>\u5176\u5be6\u53ea\u662f\u7c21\u5316\u59d4\u6d3e\u7684\u5beb\u6cd5\u800c\u5df2\uff0c\u56e0\u70ba\u5c0d\u59d4\u6d3e\u4f86\u8aaaAction<\/a>\u53ea\u662f\u4e0d\u9808\u7279\u5225\u5ba3\u544a\u53ea\u8981\u900f\u904e\u6cdb\u578b\u65b9\u6cd5<\/a>\u4f86\u5b9a\u7fa9\u8f38\u5165\u53c3\u6578\uff0c\u800c\u4e14\u6c92\u6709\u8fd4\u9084\u503c\u7684delegate<\/code>\uff0c\u63a5\u4e0b\u4f86\u4f86\u770b\u4e00\u4e0bAction<\/a>\u7684\u7bc4\u4f8b\u3002<\/p>\n
public void Add(int a, int b, Action<string> handle)\n{\n    handle($"result: {a + b}");\n}<\/code><\/pre>\n
\u4e0d\u904e\u554f\u984c\u4f86\u4e86\uff0c\u5982\u679c\u8aaa\u9084\u9700\u8981\u8fd4\u9084\u503c\u7684delegate<\/code>\u8a72\u600e\u9ebc\u8fa6\u5462\uff0c\u8acb\u770b\u4e0b\u5217Func<\/code>\u3002<\/p>\n
Func<\/h3>\n
\u770b\u5b8cAction<\/code>\u5982\u679c\u8aaa\u6211\u5011\u7684\u65b9\u6cd5\u9700\u8981\u4e00\u500b\u8fd4\u9084\u503c\u8a72\u5982\u4f55\u8655\u7406\u5462\uff0c\u9019\u6642\u5019\u5c31\u9700\u8981Func<\/code>\u51fa\u99ac\u4e86\uff0c\u5148\u8aaa\u660e\u4e00\u4e0bFunc<\/code>\u8ddfAction<\/code>\u4e0d\u540c\u7684\u662f\u5176\u6cdb\u578b\u7684\u6700\u5f8c\u4e00\u500b\u53c3\u6578\u662f\u8fd4\u9084\u503c\uff0c\u6240\u4ee5\u63a5\u4e0b\u4f86\u6211\u5011\u770b\u770bFunc<\/code>\u7684\u4f8b\u5b50\u3002<\/p>\n
public int Add(int a, int b)\n{\n    return a + b;\n}\n\npublic int Operator(int a, int b, Func<int, int, int> handle)\n{\n    return handle(a, b);\n}\n\npublic void DoSomeThing()\n{\n    var a = 1;\n    var b = 2;\n    var c = Operator(a, b, Add);\n}<\/code><\/pre>\n
\u597d\u4e86\uff0c\u5230\u9019\u908a\u95dc\u65bcdelegate<\/code>\u5df2\u7d93\u8aaa\u660e\u7684\u5dee\u4e0d\u591a\u4e86\uff0c\u63a5\u4e0b\u4f86\u8aaa\u660e\u4e00\u500b\u5f31\u5316\u7248\u7684delegate<\/code>\u3002<\/p>\n
Predicate<\/h3>\n
\u63a5\u4e0b\u4f86\u8981\u8aaa\u660e\u7684\u662fPredicate<\/code>\uff0c\u9019\u500b\u662f\u8f38\u5165\u4e00\u500b\u53c3\u6578\u7136\u5f8c\u53ea\u6709\u4e00\u500b\u8fd4\u9084\u7684\u5e03\u6797\u503c\uff0c\u6240\u4ee5\u5148\u770b\u770b\u4e0b\u5217\u7684\u7bc4\u4f8b\u3002<\/p>\n
public void Check(int a, Predicate<int> handle)\n{\n    if (handle(a))\n    {\n        \/\/ Do someting\n    }\n}<\/code><\/pre>\n
\u76f8\u4fe1\u5927\u5bb6\u770b\u5230\u9019\u500b\u7bc4\u4f8b\u4e00\u5b9a\u6703\u89ba\u5f97\u9019Predicate<\/code>\u597d\u96e3\u7528\uff0c\u4e0d\u904e\u5176\u5be6\u9019\u500b\u6700\u5e38\u7528\uff0c\u53ea\u662f\u5927\u5bb6\u90fd\u6c92\u6709\u767c\u73fe\u5230\uff0c\u665a\u4e00\u9ede\u7684\u6642\u5019\u5728\u8ddf\u5927\u5bb6\u8aaa\u660e\u3002\u6240\u4ee5\u9664\u4e86\u4e0a\u8ff0\u7684delegate<\/code>\u4e4b\u5916\u63a5\u4e0b\u4f86\u6703\u8aaa\u660e\u533f\u540d\u7684delegate<\/code><\/p>\n
Lambda<\/h3>\n
\u524d\u9762\u90fd\u8aaa\u660e\u5b8cdelegate<\/code>\u7684\u529f\u7528\uff0c\u5269\u4e0b\u7684\u53ea\u662f\u5982\u4f55\u5ba3\u544a\u7684\u5dee\u5225\u800c\u5df2\u4e86\uff0c\u63a5\u4e0b\u4f86\u8981\u8aaa\u660e\u7684\u5c31\u662f\u533f\u540d\u7684delegate<\/code>\u7684\u5beb\u6cd5\uff0c\u8acb\u5927\u5bb6\u770b\u4e00\u4e0b\u4e0b\u5217\u7bc4\u4f8b\u3002<\/p>\n
\/\/ Lambda (intput) => function\nFunc<int, int, int> multi = (a, b) => a * b;\nvar a = 2;\nvar b = 3;\nvar c = multi(a, b);<\/code><\/pre>\n
\u770b\u5230\u9019\u88e1\u8b80\u8005\u5011\u61c9\u8a72\u6703\u89ba\u5f97\u5947\u602a\u70ba\u4ec0\u9ebc\u8981\u63d0\u5230Lambda<\/code>\uff0c\u4ed6\u8ddfdelegate<\/code>\u597d\u50cf\u6c92\u95dc\u4fc2\uff0c\u56e0\u70ba\u63a5\u4e0b\u4f86\u8981\u8aaa\u660e\u4e00\u500b\u8ddfdelegate<\/code>\u6c92\u6709\u76f4\u63a5\u95dc\u4fc2\u4f46\u662f\u6703\u5f88\u5e38\u7528\u5230\u7684\u6771\u897f\u3002<\/p>\n
Linq<\/h2>\n
\u300c\u524d\u8f29\u6211\u5e38\u5e38\u807d\u5230Linq<\/code>\uff0c\u7a76\u7adf\u9019\u500b\u662f\u4ec0\u9ebc\u3002\u300d
\n\u5728\u807d\u5b8c\u5927\u982d\u4ecb\u7d39\u5b8cLambda<\/code>\u6240\u63d0\u5230\u7684\u6771\u897f\u5f15\u8d77\u5c0f\u5149\u7684\u6ce8\u610f\u3002
\n\u300cLinq\u6211\u540c\u5e38\u90fd\u6703\u62ff\u7dad\u57fa\u767e\u79d1\u7684\u8a9e\u8a00\u6574\u5408\u67e5\u8a62<\/a>\u4f86\u8aaa\u660e\uff0c\u8209\u500b\u4f8b\u5b50\u5c31\u662f\u8aaa\u5c07SQL\u7684\u8868\u9054\u5f0f\u7528\u5728C#\u7684\u8cc7\u6599\u7d50\u69cb\u4e0a\uff0c\u4e0d\u904e\u6211\u5011\u7fd2\u6163\u7684\u662f\u5bebAPI\u7684\u5beb\u6cd5\u800c\u4e0d\u662fSQL\u8a9e\u6cd5\uff0c\u53ef\u4ee5\u53c3\u8003\u4e00\u4e0bLinq<\/a>\u7684\u8aaa\u660e\u3002\u300d
\n\u807d\u5b8c\u5927\u982d\u9019\u6a23\u8aaa\u660e\u5c0f\u5149\u4e00\u526f\u4f3c\u61c2\u975e\u61c2\u7684\u6a23\u5b50\uff0c\u6240\u4ee5\u5927\u982d\u5c31\u5728\u88dc\u5145\u8aaa\u660e\u3002
\n\u300c\u8a66\u8457\u60f3\u770b\u770b\u5982\u679c\u8aaa\u4f60\u8981\u5728\u6574\u6578\u5e8f\u5217\u4e2d\u627e\u5230\u5927\u65bc10\u7684\u6574\u6578\uff0c\u4f60\u662f\u4e0d\u662f\u8166\u888b\u4e2d\u6d6e\u73feforeach<\/code>\u300d
\n\u5c0f\u5149\u807d\u5230\u5927\u982d\u7684\u984c\u76ee\u5f8c\u601d\u8003\u4e86\u4e00\u4e0b\u5c31\u9ede\u9ede\u982d\u8868\u793a\u540c\u610f\uff0c\u770b\u5230\u5c0f\u5149\u540c\u610f\u7684\u8868\u73fe\u5927\u982d\u7e7c\u7e8c\u8aaa\u4e0b\u53bb\u3002
\n\u300c\u4e0d\u904e\u9664\u4e86foreach<\/code>\u7684\u65b9\u5f0f\u9084\u6709\u4e0b\u9762\u7684\u5beb\u6cd5\u8b93\u4f60\u53c3\u8003\u4e00\u4e0b\u3002\u300d<\/p>\n
var list = new List<int> {1,12,39,58,76,1,3,7};\nvar moreThanTen = list.Where(x => x > 10);<\/code><\/pre>\n
\u300c\u54c7\uff0c\u9019\u6a23\u5beb\u771f\u7684\u597d\u7c21\u6f54\u554a\u300d
\n\u770b\u5230\u5c0f\u5149\u6b3d\u4f69\u7684\u773c\u795e\u5927\u982d\u5f97\u610f\u7684\u9ede\u9ede\u982d\u4e26\u63a5\u7e8c\u8aaa\u4e0b\u53bb\u3002
\n\u300c\u525b\u525bWhere<\/code>\u4e2d\u63a5\u7684\u53c3\u6578\u5c31\u662f\u525b\u525b\u8aaa\u5230\u7684Predicate<\/code>\uff0c\u7136\u5f8c\u65b9\u6cd5\u7684\u90e8\u5206\u5247\u662f\u525b\u525b\u8b1b\u7684Lambda<\/code>\uff0c\u6240\u4ee5\u662f\u4e0d\u662f\u525b\u525b\u8aaa\u7684\u90fd\u7528\u5230\u4e86\u3002\u300d<\/p>\n
\u5f8c\u8a18<\/h2>\n
\u300c\u524d\u8f29\uff0c\u6211\u982d\u53c8\u958b\u59cb\u6688\u4e86\u300d
\n\u5728\u8aaa\u660e\u5b8cdelegate<\/code>\u8ddfLinq<\/code>\u4e4b\u5f8c\u5c0f\u5149\u5c0d\u5927\u982d\u9019\u9ebc\u8aaa\u3002
\n\u300c\u6c92\u95dc\u4fc2\uff0c\u982d\u6688\u662f\u6b63\u5e38\u7684\uff0c\u56e0\u70ba\u6211\u4e5f\u66fe\u7d93\u6688\u904e\uff0c\u4e0d\u904e\u9019\u500b\u4f60\u6703\u5e38\u5e38\u7df4\u7fd2\u5230\u6240\u4ee5\u4e0d\u7528\u6015\u3002\u300d
\n\u6240\u4ee5\u5c0f\u5149\u7684\u9019\u4e00\u5929\u5c31\u5728\u59d4\u6d3e\u8ddfLinq<\/code>\u5ea6\u904e\u4e86\u3002<\/p>\n","protected":false},"excerpt":{"rendered":"
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\u95b1\u8b80\u5168\u6587\u3008D-21 \u59d4\u6d3e ? delegate ? Action ? Linq\u3009<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"_exactmetrics_skip_tracking":false,"_exactmetrics_sitenote_active":false,"_exactmetrics_sitenote_note":"","_exactmetrics_sitenote_category":0,"footnotes":""},"categories":[2],"tags":[90,71,92,98],"class_list":["post-2154","post","type-post","status-publish","format-standard","hentry","category-develop","tag-2021ironman","tag-c","tag-dotnetcore","tag-linq"],"_links":{"self":[{"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/posts\/2154","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/comments?post=2154"}],"version-history":[{"count":23,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/posts\/2154\/revisions"}],"predecessor-version":[{"id":2942,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/posts\/2154\/revisions\/2942"}],"wp:attachment":[{"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/media?parent=2154"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/categories?post=2154"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.develop-note.com\/blog\/wp-json\/wp\/v2\/tags?post=2154"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}