{"id":297,"date":"2022-06-30T11:40:27","date_gmt":"2022-06-30T03:40:27","guid":{"rendered":"https:\/\/www.fengjijiao.cn\/?p=297"},"modified":"2022-06-30T11:40:27","modified_gmt":"2022-06-30T03:40:27","slug":"c%e6%b3%9b%e5%9e%8b%ef%bc%88generic%ef%bc%89","status":"publish","type":"post","link":"https:\/\/www.fengjijiao.cn\/?p=297","title":{"rendered":"C#\u6cdb\u578b\uff08Generic\uff09"},"content":{"rendered":"\n<pre class=\"wp-block-code\"><code>using System;\r\n\r\ndelegate T NumberChanger&lt;T>(T n);\r\n\r\nnamespace ConsoleApp1\r\n{\r\n    class TestDelegate\r\n    {\r\n        static int num = 10;\r\n        public static int AddNum(int p)\r\n        {\r\n            num += p;\r\n            return num;\r\n        }\r\n        public static int MultNum(int q)\r\n        {\r\n            num *= q;\r\n            return num;\r\n        }\r\n        public static int getNum()\r\n        {\r\n            return num;\r\n        }\r\n    }\r\n    class Program\r\n    {\r\n        static void Main(string&#91;] args)\r\n        {\r\n            \/\/C#\u6cdb\u578b\uff08Generic\uff09\r\n            \/\/\u5b9e\u4f8b\r\n            \/\/\u58f0\u660e\u4e00\u4e2a\u6574\u578b\u6570\u7ec4\r\n            MyGenericArray&lt;int> intArray = new MyGenericArray&lt;int>(5);\r\n            \/\/\u8bbe\u7f6e\u503c\r\n            for(int c= 0;c &lt; 5; c++)\r\n            {\r\n                intArray.setItem(c, c * 5);\r\n            }\r\n            \/\/\u83b7\u53d6\u503c\r\n            for(int c = 0; c &lt; 5; c++)\r\n            {\r\n                Console.Write(intArray.getItem(c) + \" \");\r\n            }\r\n            Console.WriteLine();\r\n            \/\/\u58f0\u660e\u4e00\u4e2a\u5b57\u7b26\u6570\u7ec4\r\n            MyGenericArray&lt;char> charArray = new MyGenericArray&lt;char>(5);\r\n            \/\/\u8bbe\u7f6e\u503c\r\n            for(int i = 0; i&lt; 5;i++)\r\n            {\r\n                \/\/charArray.setItem(i, (char)(i + 97));\r\n                charArray&#91;i] = (char)(i+97);\r\n            }\r\n            \/\/\u83b7\u53d6\u503c\r\n            for(int i =0;i&lt;5;i++)\r\n            {\r\n                Console.Write(charArray.getItem(i) + \" \");\r\n            }\r\n            Console.WriteLine();\r\n            \/\/\u6cdb\u578b\u7684\u7279\u6027\r\n            \/*\r\n             * \u4f7f\u7528\u6cdb\u578b\u662f\u4e00\u79cd\u589e\u5f3a\u7a0b\u5e8f\u529f\u80fd\u7684\u6280\u672f\uff0c\u5177\u4f53\u8868\u73b0\u5728\u4ee5\u4e0b\u51e0\u4e2a\u65b9\u9762\r\n             * \u5b83\u6709\u52a9\u4e8e\u6700\u5927\u9650\u5ea6\u7684\u91cd\u7528\u4ee3\u7801\u3001\u4fdd\u62a4\u7c7b\u578b\u7684\u5b89\u5168\u4ee5\u53ca\u63d0\u9ad8\u6027\u80fd\r\n             * \u4f60\u53ef\u4ee5\u521b\u5efa\u6cdb\u578b\u96c6\u5408\u7c7b\u3002.Net\u6846\u67b6\u7c7b\u5e93\u5728System.Collections.Generic\u547d\u540d\u7a7a\u95f4\u4e2d\u5305\u542b\u4e86\u4e00\u4e9b\u65b0\u7684\u6cdb\u578b\u96c6\u5408\u7c7b\u3002\u4f60\u53ef\u4ee5\u4f7f\u7528\u8fd9\u4e9b\u6cdb\u578b\u96c6\u5408\u7c7b\u6765\u66ff\u4ee3System.Collections\u4e2d\u7684\u96c6\u5408\u7c7b\u3002\r\n             * \u4f60\u53ef\u4ee5\u521b\u5efa\u81ea\u5df1\u7684\u6cdb\u578b\u63a5\u53e3\u3001\u6cdb\u578b\u7c7b\u3001\u6cdb\u578b\u65b9\u6cd5\u3001\u6cdb\u578b\u4e8b\u4ef6\u548c\u6cdb\u578b\u59d4\u6258\u3002\r\n             * \u4f60\u53ef\u4ee5\u5bf9\u6cdb\u578b\u7c7b\u8fdb\u884c\u7ea6\u675f\u4ee5\u8bbf\u95ee\u7279\u5b9a\u6570\u636e\u7c7b\u578b\u7684\u65b9\u6cd5\r\n             * \u5173\u4e8e\u6cdb\u578b\u6570\u636e\u7c7b\u578b\u4e2d\u4f7f\u7528\u7684\u7c7b\u578b\u7684\u4fe1\u606f\u53ef\u5728\u8fd0\u884c\u65f6\u901a\u8fc7\u4f7f\u7528\u53cd\u5c04\u83b7\u53d6\r\n             *\/\r\n            \/\/\u6cdb\u578b\u65b9\u6cd5\r\n            int a, b;\r\n            char d, e;\r\n            a = 10;\r\n            b = 20;\r\n            d = 'I';\r\n            e = 'V';\r\n\r\n            Console.WriteLine(\"a = {0}, b = {1}\", a, b);\r\n            Console.WriteLine(\"d = {0}, e = {1}\", d, e);\r\n\r\n            Swap&lt;int>(ref a, ref b);\r\n            Swap&lt;char>(ref d, ref e);\r\n\r\n            Console.WriteLine(\"a = {0}, b = {1}\", a, b);\r\n            Console.WriteLine(\"d = {0}, e = {1}\", d, e);\r\n\r\n            \/\/\u6cdb\u578b\u59d4\u6258\r\n            \/*\r\n             * \u4f60\u53ef\u4ee5\u901a\u8fc7\u7c7b\u578b\u53c2\u6570\u5b9a\u4e49\u6cdb\u578b\u59d4\u6258\r\n             * delegate T NumberChanger&lt;T>(T n);\r\n             *\/\r\n            \/\/\u521b\u5efa\u59d4\u6258\u5b9e\u4f8b\r\n            NumberChanger&lt;int> nc1 = new NumberChanger&lt;int>(TestDelegate.AddNum);\r\n            NumberChanger&lt;int> nc2 = new NumberChanger&lt;int>(TestDelegate.MultNum);\r\n            \/\/\u4f7f\u7528\u59d4\u6258\u5bf9\u8c61\u8c03\u7528\u65b9\u6cd5\r\n            nc1(25);\/\/10+25=35\r\n            Console.WriteLine(\"value of Num: {0}\", TestDelegate.getNum());\r\n            nc2(5);\/\/35*5=175\r\n            Console.WriteLine(\"value of Num: {0}\", TestDelegate.getNum());\r\n            \r\n            \/\/\u6cdb\u578b\u9650\u5b9a\r\n            \/*\r\n             * \u5728\u58f0\u660e\u6cdb\u578b\u65b9\u6cd5\/\u7c7b\u7684\u65f6\u5019\u3002\u53ef\u4ee5\u7ed9\u6cdb\u578b\u52a0\u4e0a\u4e00\u5b9a\u7684\u7ea6\u675f\u6765\u6ee1\u8db3\u6211\u4eec\u7279\u5b9a\u7684\u4e00\u4e9b\u6761\u4ef6\u3002\r\n             * \u6bd4\u5982\r\n             * public class CacheHelper&lt;T> where T:new()\r\n             * {\r\n             * }\r\n             * \u6cdb\u578b\u9650\u5b9a\u6761\u4ef6\uff1a\r\n             * T: \u7ed3\u6784\uff08\u7c7b\u578b\u53c2\u6570\u5fc5\u987b\u662f\u503c\u7c7b\u578b\u3002\u53ef\u4ee5\u6307\u5b9a\u9664Nullable\u4ee5\u5916\u7684\u4efb\u4f55\u503c\u7c7b\u578b\uff09\r\n             * T: \u7c7b\uff08\u7c7b\u578b\u53c2\u6570\u5fc5\u987b\u662f\u5f15\u7528\u7c7b\u578b\uff0c\u5305\u62ec\u4efb\u4f55\u7c7b\u3001\u63a5\u53e3\u3001\u59d4\u6258\u6216\u6570\u7ec4\u7c7b\u578b\uff09\r\n             * T: new()(\u7c7b\u578b\u53c2\u6570\u5fc5\u987b\u5177\u6709\u65e0\u53c2\u6570\u7684\u516c\u5171\u6784\u9020\u51fd\u6570\u3002\u5f53\u4e0e\u5176\u4ed6\u7ea6\u675f\u4e00\u8d77\u4f7f\u7528\u65f6new()\u7ea6\u675f\u5fc5\u987b\u6700\u540e\u6307\u5b9a)\r\n             * T: &lt;\u57fa\u7c7b\u540d>\u7c7b\u578b\u53c2\u6570\u5fc5\u987b\u662f\u6307\u5b9a\u7684\u57fa\u7c7b\u6216\u6d3e\u751f\u81ea\u6307\u5b9a\u7684\u57fa\u7c7b\u3002\r\n             * T: &lt;\u63a5\u53e3\u540d\u79f0>\u7c7b\u578b\u53c2\u6570\u5fc5\u987b\u662f\u6307\u5b9a\u7684\u63a5\u53e3\u6216\u5b9e\u73b0\u6307\u5b9a\u7684\u63a5\u53e3\u3002\u53ef\u4ee5\u6307\u5b9a\u591a\u4e2a\u63a5\u53e3\u7ea6\u675f\u3002\u63a5\u53e3\u7ea6\u675f\u4e5f\u53ef\u4ee5\u662f\u6cdb\u578b\u7684\u3002\r\n             *\/\r\n\r\n            Console.ReadKey();\r\n\r\n        }\r\n        \r\n\r\n        static void Swap&lt;T>(ref T lhs, ref T rhs)\r\n        {\r\n            T temp;\r\n            temp = lhs;\r\n            lhs = rhs;\r\n            rhs = temp;\r\n        }\r\n    }\r\n\r\n\r\n\r\n    class MyGenericArray&lt;T>\r\n    {\r\n        private T&#91;] array;\r\n        public MyGenericArray(int size)\r\n        {\r\n            array = new T&#91;size + 1];\r\n        }\r\n        public T getItem(int index)\r\n        {\r\n            return array&#91;index];\r\n        }\r\n        public void setItem(int index, T value)\r\n        {\r\n            array&#91;index] = value;\r\n        }\r\n        public T this&#91;int index]\r\n        {\r\n            get\r\n            {\r\n                return array&#91;index];\r\n            }\r\n            set\r\n            {\r\n                array&#91;index] = value;\r\n            }\r\n        }\r\n    }\r\n}<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":[],"categories":[19],"tags":[23],"_links":{"self":[{"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/posts\/297"}],"collection":[{"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=297"}],"version-history":[{"count":1,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/posts\/297\/revisions"}],"predecessor-version":[{"id":298,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=\/wp\/v2\/posts\/297\/revisions\/298"}],"wp:attachment":[{"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=297"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=297"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.fengjijiao.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=297"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}