{"id":5807,"date":"2022-05-21T17:46:38","date_gmt":"2022-05-21T09:46:38","guid":{"rendered":"https:\/\/damogame.cn:15443\/wordpress\/?p=5807"},"modified":"2022-05-21T17:46:38","modified_gmt":"2022-05-21T09:46:38","slug":"%e4%b8%ba%e4%bb%80%e4%b9%88%e6%8e%a8%e8%8d%90%e4%bd%a0%e7%94%a8-c-%e6%9e%84%e5%bb%ba%e5%a4%a7%e5%9e%8b%e5%90%8e%e7%ab%af%e5%ba%94%e7%94%a8%ef%bc%9f-part-1","status":"publish","type":"post","link":"https:\/\/i007.cc\/wordpress\/archives\/5807","title":{"rendered":"\u4e3a\u4ec0\u4e48\u63a8\u8350\u4f60\u7528 C# \u6784\u5efa\u5927\u578b\u540e\u7aef\u5e94\u7528\uff1f- Part 1"},"content":{"rendered":"
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\u5982\u679c\u4f60\u5bf9\u672c\u6280\u672f\u535a\u5ba2\u53e6\u4e00\u7bc7\u4ecb\u7ecd TypeScript \u7684\u6280\u672f\u6587\u7ae0\u00a0\u300a\u4e3a\u4ec0\u4e48\u8bf4 TypeScript \u662f\u5f00\u53d1\u5927\u578b\u524d\u7aef\u9879\u76ee\u7684\u5fc5\u5907\u8bed\u8a00\u300b<\/a>\u00a0\u6709\u5370\u8c61\u7684\u8bdd\uff0c\u4f60\u5e94\u8be5\u4f1a\u8bb0\u5f97 TypeScript \u4e5f\u6709\u8fd9\u6837\u7684\u7a7a\u503c\u64cd\u4f5c\u8bed\u6cd5\u3002\u662f\u7684\uff0cTS \u662f\u501f\u9274 C# \u8fc7\u6765\u7684\uff0c\u56e0\u4e3a TypeScript \u7684\u521b\u5efa\u8005\u6b63\u662f C# \u4e4b\u7236 Anders Hejlsberg\uff01<\/p>\n
\u9690\u5f0f\u7c7b\u578b\u672c\u5730\u53d8\u91cf<\/h4>\n
\u4e3a\u4ec0\u4e48\u5f88\u591a Java \u5f00\u53d1\u8005\u4f1a\u62b1\u6028\u8bf4\u5199 Java \u5c31\u50cf\u5728\u5199\u53c8\u81ed\u53c8\u957f\u7684\u516b\u80a1\u6587\uff0c\u5c31\u662f\u56e0\u4e3a\u5728 Java \u4e2d\u6bcf\u58f0\u660e\u4e00\u4e2a\u65b0\u53d8\u91cf\u4f60\u90fd\u4e0d\u5f97\u4e0d\u53bb\u601d\u8003\u5b83\u7684\u7c7b\u578b\uff0c\u4ece\u800c\u9700\u8981\u82b1\u5927\u91cf\u7684\u8111\u5bb9\u91cf\u6765\u63a8\u6f14\u548c\u8bb0\u5fc6\u4e34\u65f6\u53d8\u91cf\u7684\u7c7b\u578b\u3002\u8fd9\u5bf9\u4e8e\u5f00\u53d1\u6548\u7387\u6765\u8bf4\u771f\u7684\u4e0d\u662f\u597d\u4e8b\u60c5\u3002<\/p>\n
\u800c C# \u501f\u9274\u4e86\u5176\u4ed6\u975e\u5f3a\u5236\u8981\u6c42\u53d8\u91cf\u7c7b\u578b\u58f0\u660e\u7684\u7f16\u7a0b\u8bed\u8a00\uff0c\u96c6\u6210\u4e86\u9690\u5f0f\u7c7b\u578b\u672c\u5730\u53d8\u91cf\uff08Implicitly typed local variables\uff09\u8bed\u6cd5\u3002\u7b14\u8005\u8ba4\u4e3a\u9690\u5f0f\u7c7b\u578b\u672c\u5730\u53d8\u91cf\u662f C# \u4e2d\u975e\u5e38\u9177\u7684\u7279\u6027\uff0c\u5b83\u8ba9\u5f00\u53d1\u8005\u4e0d\u7528\u5f3a\u8feb\u81ea\u5df1\u8bb0\u4f4f\u9700\u8981\u5f15\u7528\u6216\u9700\u8981\u58f0\u660e\u7684\u53d8\u91cf\u7c7b\u578b\uff0c\u4ece\u800c\u5c06\u6ce8\u610f\u529b\u805a\u7126\u5728\u4ee3\u7801\u903b\u8f91\u4e0a\u3002<\/p>\n
C# \u7528 JavaScript \u4e2d\u7684\u00a0var<\/code>\u00a0\u5173\u952e\u5b57\u6765\u58f0\u660e\u9690\u5f0f\u7c7b\u578b\u672c\u5730\u53d8\u91cf\uff0c\u5b83\u80fd\u591f\u8ba9\u8be5\u53d8\u91cf\u901a\u8fc7\u9690\u5f0f\u7684\u7c7b\u578b\u63a8\u65ad\u6765 \u201c\u81ea\u52a8\u201d \u58f0\u660e\u8be5\u53d8\u91cf\u7c7b\u578b\u3002\u4e0b\u9762\u9644\u4e0a C# \u6587\u6863\u7684\u5b98\u65b9\u4f8b\u5b50\u6765\u8bf4\u660e\u5982\u4f55\u4f7f\u7528\u9690\u5f0f\u7c7b\u578b\u672c\u5730\u53d8\u91cf\u3002<\/p>\n
\/\/\u00a0i\u00a0is\u00a0compiled\u00a0as\u00a0an\u00a0int\r\nvar\u00a0i\u00a0=\u00a05;\r\n\r\n\/\/\u00a0s\u00a0is\u00a0compiled\u00a0as\u00a0a\u00a0string\r\nvar\u00a0s\u00a0=\u00a0\"Hello\";\r\n\r\n\/\/\u00a0a\u00a0is\u00a0compiled\u00a0as\u00a0int[]\r\nvar\u00a0a\u00a0=\u00a0new[]\u00a0{\u00a00,\u00a01,\u00a02\u00a0};\r\n\r\n\/\/\u00a0expr\u00a0is\u00a0compiled\u00a0as\u00a0IEnumerable<Customer>\r\n\/\/\u00a0or\u00a0perhaps\u00a0IQueryable<Customer>\r\nvar\u00a0expr\u00a0=\r\n\u00a0\u00a0\u00a0\u00a0from\u00a0c\u00a0in\u00a0customers\r\n\u00a0\u00a0\u00a0\u00a0where\u00a0c.City\u00a0==\u00a0\"London\"\r\n\u00a0\u00a0\u00a0\u00a0select\u00a0c;\r\n\r\n\/\/\u00a0anon\u00a0is\u00a0compiled\u00a0as\u00a0an\u00a0anonymous\u00a0type\r\nvar\u00a0anon\u00a0=\u00a0new\u00a0{\u00a0Name\u00a0=\u00a0\"Terry\",\u00a0Age\u00a0=\u00a034\u00a0};\r\n\r\n\/\/\u00a0list\u00a0is\u00a0compiled\u00a0as\u00a0List<int>\r\nvar\u00a0list\u00a0=\u00a0new\u00a0List<int>();\r\n<\/code><\/pre>\n
\u5f53\u7136\uff0c\u5927\u91cf\u7684\u4f7f\u7528\u00a0var<\/code>\u00a0\u4e5f\u53ef\u80fd\u4f1a\u9020\u6210\u4e00\u4e9b\u95ee\u9898\u3002\u4f8b\u5982\uff0c\u5305\u542b\u5927\u91cf\u5305\u542b\u9690\u5f0f\u7c7b\u578b\u672c\u5730\u53d8\u91cf\u7684\u4ee3\u7801\u4f1a\u8ba9\u4e0d\u719f\u6089\u7684\u8be5\u4ee3\u7801\u7684 C# \u5f00\u53d1\u8005\u82b1\u4e0d\u5c11\u65f6\u95f4\u6765\u7422\u78e8\u8be5\u53d8\u91cf\u7684\u5b9e\u9645\u7c7b\u578b\uff0c\u4ece\u800c\u5f71\u54cd\u4ee3\u7801\u7684\u53ef\u8bfb\u6027\u3002\u4e0d\u8fc7\uff0c\u5e38\u7528\u7684 C# IDE \u4f8b\u5982 Visual Studio \u6216 JetBrains Rider \u90fd\u53ef\u4ee5\u81ea\u52a8\u5e2e\u4f60\u663e\u793a\u8be5\u9690\u5f0f\u7c7b\u578b\u672c\u5730\u53d8\u91cf\u7684\u5b9e\u9645\u7c7b\u578b\u3002\u6b63\u662f\u501f\u52a9\u8fd9\u4e9b\u5f3a\u5927\u7684 IDE\uff0c\u7b14\u8005\u624d\u653e\u5fc3\u63a8\u8350\u4f7f\u7528 C# \u7684\u00a0var<\/code>\u00a0\u8bed\u6cd5\u6765\u58f0\u660e\u53d8\u91cf\u3002<\/p>\n
\u8bed\u8a00\u96c6\u6210\u67e5\u8be2 (LINQ)<\/h4>\n
\u9664\u4e86\u4e0a\u8ff0\u4e24\u4e2a\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\u7684\u8bed\u6cd5\u5916\uff0cC# \u8fd8\u6709\u4e00\u4e2a\u975e\u5e38\u65b0\u9896\u7684\u8bed\u6cd5\u7279\u6027\uff1a\u8bed\u8a00\u96c6\u6210\u67e5\u8be2\uff0c\u7b80\u79f0\u4e3a LINQ\u3002LINQ \u7684\u51fa\u73b0\u8ba9\u6570\u636e\u6e90\u64cd\u4f5c\u7684\u8868\u8fbe\u5f0f\u53d8\u5f97\u8db3\u591f\u7b80\u5355\u3002\u7b14\u8005\u6709\u7406\u7531\u76f8\u4fe1 C# \u7684\u521b\u9020\u8005\u4e00\u5b9a\u662f\u53c2\u8003\u4e86 SQL \u8fd9\u6837\u7684\u67e5\u8be2\u8bed\u8a00\u6765\u8bbe\u8ba1 LINQ \u8bed\u6cd5\u7684\u3002\u4e0b\u9762\u662f\u4e00\u4e2a\u4f7f\u7528 LINQ \u7684\u4f8b\u5b50\u3002<\/p>\n
class\u00a0LINQQueryExpressions\r\n{\r\n\u00a0\u00a0\u00a0\u00a0static\u00a0void\u00a0Main()\r\n\u00a0\u00a0\u00a0\u00a0{\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0Specify\u00a0the\u00a0data\u00a0source.\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0int[]\u00a0scores\u00a0=\u00a0new\u00a0int[]\u00a0{\u00a097,\u00a092,\u00a081,\u00a060\u00a0};\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0Define\u00a0the\u00a0query\u00a0expression.\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0IEnumerable<int>\u00a0scoreQuery\u00a0=\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0from\u00a0score\u00a0in\u00a0scores\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0where\u00a0score\u00a0>\u00a080\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0select\u00a0score;\r\n\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\/\/\u00a0Execute\u00a0the\u00a0query.\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0foreach\u00a0(int\u00a0i\u00a0in\u00a0scoreQuery)\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0Console.Write(i\u00a0+\u00a0\"\u00a0\");\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0}\r\n\u00a0\u00a0\u00a0\u00a0}\r\n}\r\n\/\/\u00a0Output:\u00a097\u00a092\u00a081\r\n<\/code><\/pre>\n
\u6211\u4eec\u7740\u91cd\u770b\u00a0scoreQuery<\/code>\u00a0\u8fd9\u4e2a\u53d8\u91cf\u7684\u8868\u8fbe\u5f0f\uff0c\u5176\u4e2d\u7684\u00a0from ... in ... where ... select ...<\/code>\u00a0\u8bed\u6cd5\u5c31\u662f\u7528\u4e86 LINQ\u3002\u5176\u8868\u8fbe\u7684\u610f\u601d\u662f\u904d\u5386\u00a0scores<\/code>\u00a0\u8fd9\u4e2a\u6570\u7ec4\uff0c\u53ea\u9009\u53d6\u00a0score<\/code>\u00a0\u5927\u4e8e 80 \u7684\u5143\u7d20\uff0c\u6700\u540e\u8fd4\u56de\u00a0score<\/code>\u00a0\u884c\u7a0b\u65b0\u7684\u8fed\u4ee3\u5668\u00a0scoreQuery<\/code>\u3002\u8fd9\u8ddf SQL \u7684\u00a0SELECT ... FROM<\/code>\u00a0\u8bed\u6cd5\u975e\u5e38\u76f8\u4f3c\u3002LINQ \u5bf9\u4e8e C# \u6765\u8bf4\u53ea\u662f\u4e00\u4e2a\u8868\u8fbe\u5f0f\uff0c\u76ee\u7684\u662f\u4e3a\u4e86\u5c06\u5e38\u89c4\u7684\u6570\u636e\u7279\u522b\u662f\u6570\u7ec4\u64cd\u4f5c\uff0c\u53d8\u5f97\u8ddf\u5199 SQL \u4e00\u6837\u7b80\u5355\u3002\u5982\u679c\u4e0d\u7528 LINQ\uff0c\u4f60\u53ef\u80fd\u4f1a\u9700\u8981\u7528\u00a0foreach<\/code>\u00a0\u904d\u5386\u6570\u7ec4\u5e76\u505a\u00a0if<\/code>\u00a0\u5224\u65ad\uff0c\u7136\u540e\u52a0\u5165\u66f4\u591a\u64cd\u4f5c\u6765\u5b9e\u73b0\u8ddf\u4e0a\u8ff0 LINQ \u8bed\u53e5\u76f8\u540c\u7684\u903b\u8f91\u3002<\/p>\n
\u5728\u540e\u9762\u4ecb\u7ecd Entity Framework \u6570\u636e\u5e93\u64cd\u4f5c\u6846\u67b6\u7684\u90e8\u5206\uff0c\u6211\u4eec\u8fd8\u4f1a\u7ee7\u7eed\u4ecb\u7ecd C# \u4e2d\u7684\u6570\u636e\u64cd\u4f5c\u3002<\/p>\n
\u5c5e\u6027\u8bed\u6cd5<\/h4>\n
C# \u5b9a\u4e49\u6a21\u578b\u7684\u65b9\u5f0f\u76f8\u5bf9\u4e8e Java \u8981\u7b80\u5355\u5f88\u591a\uff0c\u540c\u65f6\u8fd8\u652f\u6301\u66f4\u9ad8\u7ea7\u7684\u7279\u6027\uff0c\u4f8b\u5982\u00a0get<\/code>\u00a0\u6216\u00a0=><\/code>\u00a0\u5b9a\u4e49\u7684\u8ba1\u7b97\u5c5e\u6027\u3002<\/p>\n
public\u00a0class\u00a0Person\r\n{\r\n\u00a0\u00a0\/\/\u00a0private\u00a0properties\r\n\u00a0\u00a0private\u00a0int\u00a0_gender;\r\n\u00a0\u00a0private\u00a0int\u00a0_age;\r\n\r\n\u00a0\u00a0\/\/\u00a0Auto-implemented\u00a0property\r\n\u00a0\u00a0public\u00a0string\u00a0Name\u00a0{\u00a0get;\u00a0set;\u00a0}\r\n\r\n\u00a0\u00a0\/\/\u00a0Expression\u00a0body\u00a0definition\r\n\u00a0\u00a0public\u00a0string\u00a0Gender\u00a0=>\u00a0_gender\u00a0==\u00a01\u00a0?\u00a0\"Male\"\u00a0:\u00a0\"Female\";\r\n\r\n\u00a0\u00a0\/\/\u00a0Property\u00a0with\u00a0backing\u00a0fields\r\n\u00a0\u00a0public\u00a0string\u00a0Age\r\n\u00a0\u00a0{\r\n\u00a0\u00a0\u00a0get\r\n\u00a0\u00a0\u00a0\u00a0{\r\n\u00a0\u00a0\u00a0\u00a0\u00a0\u00a0return\u00a0$\"{_age}\u00a0years\u00a0old\";\r\n\u00a0\u00a0\u00a0\u00a0}\r\n\u00a0\u00a0}\r\n}\r\n<\/code><\/pre>\n
\u5728\u4e0a\u9762\u7684\u4f8b\u5b50\u4e2d\uff0c\u6211\u4eec\u770b\u5230\u6709\u591a\u79cd\u5b9a\u4e49\u5c5e\u6027\u7684\u65b9\u5f0f\u3002Name<\/code>\u00a0\u662f\u81ea\u52a8\u5b9e\u73b0\u7684\u5c5e\u6027\uff0c\u53ea\u9700\u8981\u5e26\u4e0a\u00a0get<\/code>\u00a0\u548c\u00a0set<\/code>\u00a0\u8868\u793a\u662f\u53ef\u8bfb\u5199\u7684\u5c5e\u6027\uff1bGender<\/code>\u00a0\u662f\u7528\u00a0=><\/code>\u00a0\u8868\u793a\u7b80\u5316\u7684\u00a0get<\/code>\u00a0\u8bbf\u95ee\u5668\uff0c\u7528\u4e8e\u8f83\u4e3a\u7b80\u5355\u7684\u8ba1\u7b97\u5c5e\u6027\uff1bAge<\/code>\u00a0\u5305\u542b\u00a0get<\/code>\u00a0\u8bbf\u95ee\u5668\uff0c\u7528\u4e8e\u8f83\u4e3a\u590d\u6742\u7684\u8ba1\u7b97\u5c5e\u6027\u3002<\/p>\n
\u53ef\u4ee5\u770b\u5230\uff0cC# \u7684\u5c5e\u6027\u8bed\u6cd5\u540c\u65f6\u5305\u542b\u4e86\u7b80\u5355\u548c\u590d\u6742\u7684\u4f7f\u7528\u573a\u666f\uff0c\u56e0\u6b64\u66f4\u80fd\u591f\u63d0\u9ad8\u5f00\u53d1\u6548\u7387\u3002<\/p>\n
\u603b\u7ed3<\/h2>\n
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