C# \u53cd\u5c04\uff08Reflection\uff09<\/strong><\/div>\n
\u53ef\u4ee5\u4f7f\u7528\u53cd\u5c04\u52a8\u6001\u5730\u521b\u5efa\u7c7b\u578b\u7684\u5b9e\u4f8b\uff0c\u5c06\u7c7b\u578b\u7ed1\u5b9a\u5230\u73b0\u6709\u5bf9\u8c61\uff0c\u6216\u4ece\u73b0\u6709\u5bf9\u8c61\u4e2d\u83b7\u53d6\u7c7b\u578b\u3002\u7136\u540e\uff0c\u53ef\u4ee5\u8c03\u7528\u7c7b\u578b\u7684\u65b9\u6cd5\u6216\u8bbf\u95ee\u5176\u5b57\u6bb5\u548c\u5c5e\u6027\u3002<\/p>\n
\u4f18\u7f3a\u70b9<\/strong><\/span><\/div>\n
\u4f18\u70b9\uff1a<\/p>\n
\n
\u53cd\u5c04\u63d0\u9ad8\u4e86\u7a0b\u5e8f\u7684\u7075\u6d3b\u6027\u548c\u6269\u5c55\u6027\u3002<\/li>\n
\u964d\u4f4e\u8026\u5408\u6027\uff0c\u63d0\u9ad8\u81ea\u9002\u5e94\u80fd\u529b\u3002<\/li>\n
\u5b83\u5141\u8bb8\u7a0b\u5e8f\u521b\u5efa\u548c\u63a7\u5236\u4efb\u4f55\u7c7b\u7684\u5bf9\u8c61\uff0c\u65e0\u9700\u63d0\u524d\u786c\u7f16\u7801\u76ee\u6807\u7c7b\u3002<\/li>\n<\/ol>\n
\u7f3a\u70b9\uff1a<\/p>\n
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\u6027\u80fd\u95ee\u9898\uff1a\u4f7f\u7528\u53cd\u5c04\u57fa\u672c\u4e0a\u662f\u4e00\u79cd\u89e3\u91ca\u64cd\u4f5c\uff0c\u7528\u4e8e\u5b57\u6bb5\u548c\u65b9\u6cd5\u63a5\u5165\u65f6\u8981\u8fdc\u6162\u4e8e\u76f4\u63a5\u4ee3\u7801\u3002\u56e0\u6b64\u53cd\u5c04\u673a\u5236\u4e3b\u8981\u5e94\u7528\u5728\u5bf9\u7075\u6d3b\u6027\u548c\u62d3\u5c55\u6027\u8981\u6c42\u5f88\u9ad8\u7684\u7cfb\u7edf\u6846\u67b6\u4e0a\uff0c\u666e\u901a\u7a0b\u5e8f\u4e0d\u5efa\u8bae\u4f7f\u7528\u3002<\/li>\n
\u4f7f\u7528\u53cd\u5c04\u4f1a\u6a21\u7cca\u7a0b\u5e8f\u5185\u90e8\u903b\u8f91\uff1b\u7a0b\u5e8f\u5458\u5e0c\u671b\u5728\u6e90\u4ee3\u7801\u4e2d\u770b\u5230\u7a0b\u5e8f\u7684\u903b\u8f91\uff0c\u53cd\u5c04\u5374\u7ed5\u8fc7\u4e86\u6e90\u4ee3\u7801\u7684\u6280\u672f\uff0c\u56e0\u800c\u4f1a\u5e26\u6765\u7ef4\u62a4\u7684\u95ee\u9898\uff0c\u53cd\u5c04\u4ee3\u7801\u6bd4\u76f8\u5e94\u7684\u76f4\u63a5\u4ee3\u7801\u66f4\u590d\u6742\u3002<\/li>\n<\/ol>\n
\u53cd\u5c04\uff08Reflection\uff09\u7684\u7528\u9014<\/strong><\/div>\n
\u53cd\u5c04\uff08Reflection\uff09\u6709\u4e0b\u5217\u7528\u9014\uff1a<\/p>\n
\n
\u5b83\u5141\u8bb8\u5728\u8fd0\u884c\u65f6\u67e5\u770b\u7279\u6027\uff08attribute\uff09\u4fe1\u606f\u3002<\/li>\n
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\u5b83\u5141\u8bb8\u5ef6\u8fdf\u7ed1\u5b9a\u7684\u65b9\u6cd5\u548c\u5c5e\u6027\uff08property\uff09\u3002<\/li>\n
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\u67e5\u770b\u5143\u6570\u636e<\/strong><\/div>\n
\u6211\u4eec\u5df2\u7ecf\u5728\u4e0a\u9762\u7684\u7ae0\u8282\u4e2d\u63d0\u5230\u8fc7\uff0c\u4f7f\u7528\u53cd\u5c04\uff08Reflection\uff09\u53ef\u4ee5\u67e5\u770b\u7279\u6027\uff08attribute\uff09\u4fe1\u606f\u3002<\/p>\n
System.Reflection \u7c7b\u7684 MemberInfo \u5bf9\u8c61\u9700\u8981\u88ab\u521d\u59cb\u5316\uff0c\u7528\u4e8e\u53d1\u73b0\u4e0e\u7c7b\u76f8\u5173\u7684\u7279\u6027\uff08attribute\uff09\u3002\u4e3a\u4e86\u505a\u5230\u8fd9\u70b9\uff0c\u60a8\u53ef\u4ee5\u5b9a\u4e49\u76ee\u6807\u7c7b\u7684\u4e00\u4e2a\u5bf9\u8c61\uff0c\u5982\u4e0b\uff1a<\/p>\n
System.Reflection.MemberInfo info = typeof(MyClass);<\/pre>\n
\u4e0b\u9762\u7684\u7a0b\u5e8f\u6f14\u793a\u4e86\u8fd9\u70b9\uff1a<\/p>\n
\u5b9e\u4f8b<\/p>\n
using System;\r\n\r\n[AttributeUsage(AttributeTargets.All)]\r\npublic class HelpAttribute : System.Attribute\r\n{\r\n public readonly string Url;\r\n\r\n public string Topic \/\/ Topic \u662f\u4e00\u4e2a\u547d\u540d\uff08named\uff09\u53c2\u6570\r\n {\r\n get\r\n {\r\n return topic;\r\n }\r\n set\r\n {\r\n\r\n topic = value;\r\n }\r\n }\r\n\r\n public HelpAttribute(string url) \/\/ url \u662f\u4e00\u4e2a\u5b9a\u4f4d\uff08positional\uff09\u53c2\u6570\r\n {\r\n this.Url = url;\r\n }\r\n\r\n private string topic;\r\n}\r\n[HelpAttribute(\"Information on the class MyClass\")]\r\nclass MyClass\r\n{\r\n}\r\n\r\nnamespace AttributeAppl\r\n{\r\n class Program\r\n {\r\n static void Main(string[] args)\r\n {\r\n System.Reflection.MemberInfo info = typeof(MyClass);\r\n object[] attributes = info.GetCustomAttributes(true);\r\n for (int i = 0; i < attributes.Length; i++)\r\n {\r\n System.Console.WriteLine(attributes[i]);\r\n }\r\n Console.ReadKey();\r\n\r\n }\r\n }\r\n}<\/pre>\n
\u5f53\u4e0a\u9762\u7684\u4ee3\u7801\u88ab\u7f16\u8bd1\u548c\u6267\u884c\u65f6\uff0c\u5b83\u4f1a\u663e\u793a\u9644\u52a0\u5230\u7c7b MyClass \u4e0a\u7684\u81ea\u5b9a\u4e49\u7279\u6027\uff1a<\/p>\n
HelpAttribute<\/pre>\n
\u5b9e\u4f8b<\/strong><\/div>\n
\u5728\u672c\u5b9e\u4f8b\u4e2d\uff0c\u6211\u4eec\u5c06\u4f7f\u7528\u5728\u4e0a\u4e00\u7ae0\u4e2d\u521b\u5efa\u7684 DeBugInfo \u7279\u6027\uff0c\u5e76\u4f7f\u7528\u53cd\u5c04\uff08Reflection\uff09\u6765\u8bfb\u53d6 Rectangle \u7c7b\u4e2d\u7684\u5143\u6570\u636e\u3002<\/p>\n
\u5b9e\u4f8b<\/p>\n
using System;\r\nusing System.Reflection;\r\nnamespace BugFixApplication\r\n{\r\n \/\/ \u4e00\u4e2a\u81ea\u5b9a\u4e49\u7279\u6027 BugFix \u88ab\u8d4b\u7ed9\u7c7b\u53ca\u5176\u6210\u5458\r\n [AttributeUsage(AttributeTargets.Class |\r\n AttributeTargets.Constructor |\r\n AttributeTargets.Field |\r\n AttributeTargets.Method |\r\n AttributeTargets.Property,\r\n AllowMultiple = true)]\r\n\r\n public class DeBugInfo : System.Attribute\r\n {\r\n private int bugNo;\r\n private string developer;\r\n private string lastReview;\r\n public string message;\r\n\r\n public DeBugInfo(int bg, string dev, string d)\r\n {\r\n this.bugNo = bg;\r\n this.developer = dev;\r\n this.lastReview = d;\r\n }\r\n\r\n public int BugNo\r\n {\r\n get\r\n {\r\n return bugNo;\r\n }\r\n }\r\n public string Developer\r\n {\r\n get\r\n {\r\n return developer;\r\n }\r\n }\r\n public string LastReview\r\n {\r\n get\r\n {\r\n return lastReview;\r\n }\r\n }\r\n public string Message\r\n {\r\n get\r\n {\r\n return message;\r\n }\r\n set\r\n {\r\n message = value;\r\n }\r\n }\r\n }\r\n [DeBugInfo(45, \"Zara Ali\", \"12\/8\/2012\",\r\n Message = \"Return type mismatch\")]\r\n [DeBugInfo(49, \"Nuha Ali\", \"10\/10\/2012\",\r\n Message = \"Unused variable\")]\r\n class Rectangle\r\n {\r\n \/\/ \u6210\u5458\u53d8\u91cf\r\n protected double length;\r\n protected double width;\r\n public Rectangle(double l, double w)\r\n {\r\n length = l;\r\n width = w;\r\n }\r\n [DeBugInfo(55, \"Zara Ali\", \"19\/10\/2012\",\r\n Message = \"Return type mismatch\")]\r\n public double GetArea()\r\n {\r\n return length * width;\r\n }\r\n [DeBugInfo(56, \"Zara Ali\", \"19\/10\/2012\")]\r\n public void Display()\r\n {\r\n Console.WriteLine(\"Length: {0}\", length);\r\n Console.WriteLine(\"Width: {0}\", width);\r\n Console.WriteLine(\"Area: {0}\", GetArea());\r\n }\r\n }\/\/end class Rectangle \r\n \r\n class ExecuteRectangle\r\n {\r\n static void Main(string[] args)\r\n {\r\n Rectangle r = new Rectangle(4.5, 7.5);\r\n r.Display();\r\n Type type = typeof(Rectangle);\r\n \/\/ \u904d\u5386 Rectangle \u7c7b\u7684\u7279\u6027\r\n foreach (Object attributes in type.GetCustomAttributes(false))\r\n {\r\n DeBugInfo dbi = (DeBugInfo)attributes;\r\n if (null != dbi)\r\n {\r\n Console.WriteLine(\"Bug no: {0}\", dbi.BugNo);\r\n Console.WriteLine(\"Developer: {0}\", dbi.Developer);\r\n Console.WriteLine(\"Last Reviewed: {0}\",\r\n dbi.LastReview);\r\n Console.WriteLine(\"Remarks: {0}\", dbi.Message);\r\n }\r\n }\r\n \r\n \/\/ \u904d\u5386\u65b9\u6cd5\u7279\u6027\r\n foreach (MethodInfo m in type.GetMethods())\r\n {\r\n foreach (Attribute a in m.GetCustomAttributes(true))\r\n {\r\n DeBugInfo dbi = (DeBugInfo)a;\r\n if (null != dbi)\r\n {\r\n Console.WriteLine(\"Bug no: {0}, for Method: {1}\",\r\n dbi.BugNo, m.Name);\r\n Console.WriteLine(\"Developer: {0}\", dbi.Developer);\r\n Console.WriteLine(\"Last Reviewed: {0}\",\r\n dbi.LastReview);\r\n Console.WriteLine(\"Remarks: {0}\", dbi.Message);\r\n }\r\n }\r\n }\r\n Console.ReadLine();\r\n }\r\n }\r\n}<\/pre>\n
\u5f53\u4e0a\u9762\u7684\u4ee3\u7801\u88ab\u7f16\u8bd1\u548c\u6267\u884c\u65f6\uff0c\u5b83\u4f1a\u4ea7\u751f\u4e0b\u5217\u7ed3\u679c\uff1a<\/p>\n
Length: 4.5\r\nWidth: 7.5\r\nArea: 33.75\r\nBug No: 49\r\nDeveloper: Nuha Ali\r\nLast Reviewed: 10\/10\/2012\r\nRemarks: Unused variable\r\nBug No: 45\r\nDeveloper: Zara Ali\r\nLast Reviewed: 12\/8\/2012\r\nRemarks: Return type mismatch\r\nBug No: 55, for Method: GetArea\r\nDeveloper: Zara Ali\r\nLast Reviewed: 19\/10\/2012\r\nRemarks: Return type mismatch\r\nBug No: 56, for Method: Display\r\nDeveloper: Zara Ali\r\nLast Reviewed: 19\/10\/2012\r\nRemarks:<\/pre>\n","protected":false},"excerpt":{"rendered":"
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