最近要改C++的东西到C#上，它的委托了特性感觉很好的利用了装饰模式和函数指针的优点，非常值得深入学习，Mark基本特性以便查阅
1: #define DoTrace 2: using System; 3: using System.Collections.Generic; 4: using System.Linq; 5: using System.Text; 6: using System.Reflection; 7: using System.Diagnostics; 8: using System.Collections; 9: using System.IO; 10: 11: using System.Runtime.Serialization.Formatters.Binary; 12: using System.Runtime.Serialization.Formatters.Soap; 13: using System.Xml.Serialization; 14: using System.Xml; 15: using System.Runtime.InteropServices; 16: 17: 18: 19: 22: 23: 24: namespace First_C_Sharp 25: { 26: 27: 48: 49: 50: 56: [AttributeUsage(AttributeTargets.Method|AttributeTargets.Class, 57: Inherited = false, 58: AllowMultiple = false)] //限制属性只能引用在方法和类上,并且特性不会被装饰类的派生类继承，不能有MyAttribute的多个实例应用到同一个目标上 59: public sealed class MyAttributeAttribute : System.Attribute 60: { 61: public string Description; 62: public string ver; 63: public string Reviewer; 64: 65: public MyAttributeAttribute(string desc) //一个位置参数 66: { 67: Description = desc; 68: Console.WriteLine("Using Attribute Class:{0}", Description); 69: } 70: 71: }//MyAttributeAttribute Class 72: 73: [MyAttribute("This is a Attribute Class test Class", Reviewer = "Lucy Liu", ver = "1.0Beta")] 74: class attributeTestClass 75: { 76: public void writeDescription() 77: { 78: Console.WriteLine("-----MyAttribute Class Testing----"); 79: } 80: } 81: 82: 83: 84: 90: 91: public class dllIMportClass 92: { 93: 94: [DllImportAttribute("CDll_for_DLLImport.dll")] 95: public static extern int sampleMethod(int i); 96: 97: }//dllImportClass 98: 99: 100: 120: [Serializable] 121: public class Book 122: { 123: public string strBookName; 124: [NonSerialized] 125: public string strBookPwd; 126: 127: private string _bookID; 128: public string BookID 129: { 130: get { return _bookID; } 131: set { _bookID = value; } 132: } 133: 134: public ArrayList alBookReader; 135: 136: private String _bookPrice; 137: public void SetBookPrice(String price) 138: { 139: _bookPrice = price; 140: } 141: 142: public Book() 143: { 144: alBookReader = new ArrayList(); 145: } 146: 147: public void Write() 148: { 149: Console.WriteLine("Book ID:" + BookID); 150: Console.WriteLine("Book Name" + strBookName); 151: Console.WriteLine("Book Password:" + strBookPwd); 152: Console.WriteLine("Book Price" + _bookPrice); 153: Console.WriteLine("Book Reader"); 154: for(int i = 0; i 155: { 156: Console.WriteLine(alBookReader[i]); 157: } 158: } 159: } 160: 161: public class BinarySerialize 162: { 163: string strFile = "c:book.binary"; 164: 165: public void Serialize(Book book) 166: { 167: using(FileStream fs = new FileStream(strFile, FileMode.Create)) 168: { 169: BinaryFormatter formatter = new BinaryFormatter(); 170: formatter.Serialize(fs, book); 171: } 172: Console.WriteLine("Binary Serialize Success"); 173: } 174: 175: public Book DeSerialize() 176: { 177: Book book; 178: using (FileStream fs = new FileStream(strFile, FileMode.Open)) 179: { 180: BinaryFormatter formatter = new BinaryFormatter(); 181: book = (Book)formatter.Deserialize(fs); 182: } 183: Console.WriteLine("Binary Deseiralize Success"); 184: return book; 185: } 186: }//BinarySerialize 187: 188: public class SoapSerialize 189: { 190: string strFile = "c:book.soap"; 191: 192: public void Serialize(Book book) 193: { 194: using(FileStream fs = new FileStream(strFile, FileMode.Create)) 195: { 196: SoapFormatter formatter = new SoapFormatter(); 197: 198: formatter.Serialize(fs, book); 199: 200: Console.WriteLine("Soap Serialize Success"); 201: } 202: } 203: 204: public Book DeSerialize() 205: { 206: Book book; 207: using(FileStream fs = new FileStream(strFile, FileMode.Open)) 208: { 209: SoapFormatter formatter = new SoapFormatter(); 210: book = (Book)formatter.Deserialize(fs); 211: } 212: Console.WriteLine("Soap Deserialize Success"); 213: return book; 214: } 215: }//SerializeSoap 216: 217: public class XmlSerialize 218: { 219: string strFile = "c:book.xml"; 220: 221: public void Serialize(Book book) 222: { 223: using(FileStream fs = new FileStream(strFile, FileMode.Create)) 224: { 225: XmlSerializer formatter = new XmlSerializer(typeof(Book)); 226: formatter.Serialize(fs, book); 227: 228: Console.WriteLine("XML Serialize Success"); 229: } 230: } 231: 232: public Book DeSerialize() 233: { 234: Book book; 235: using(FileStream fs= new FileStream(strFile, FileMode.Open)) 236: { 237: XmlSerializer formatter = new XmlSerializer(typeof(Book)); 238: book = (Book)formatter.Deserialize(fs); 239: } 240: Console.WriteLine("XML Deserialize Success"); 241: return book; 242: } 243: }//SeiralizeXML 244: 245: class Test_Reflection 246: { 247: 248: 251: 252: 253: [Obsolete("Use method SuperPrintOut")] //将特性应用到方法 254: static void PrintOut(string str) 255: { 256: Console.WriteLine(str); 257: } 258: 259: [Conditional("DoTrace")] 260: static void TraceMessage(string str) 261: { 262: Console.WriteLine(str); 263: } 264: 265: 266: 271: 272: static void Main(string[] args) 273: { 274: //Absolete Test 275: PrintOut("Start of Main"); 276: 277: //Conditional Test 278: TraceMessage("Test Conditional "); 279: TraceMessage("Test Conditional Again"); 280: 281: //Serialize Test 282: Book book = new Book(); 283: book.BookID ="1"; 284: book.alBookReader.Add("gspring"); 285: book.alBookReader.Add("Lucy"); 286: book.strBookName = "C#Plus"; 287: book.strBookPwd = "*****"; 288: book.SetBookPrice("30.00"); 289: 290: BinarySerialize bs = new BinarySerialize(); 291: SoapSerialize ss = new SoapSerialize(); 292: XmlSerialize xs = new XmlSerialize(); 293: 294: bs.Serialize(book); 295: ss.Serialize(book); 296: xs.Serialize(book); 297: 298: Book rebook = bs.DeSerialize(); 299: rebook.Write(); 300: rebook = ss.DeSerialize(); 301: rebook.Write(); 302: rebook = xs.DeSerialize(); //xml 只能序列化public 303: rebook.Write(); 304: 305: //DllImport Test 306: Console.WriteLine("DllImport Test, The Return Value is :{0}", dllIMportClass.sampleMethod(5)); 307: 308: //MyAttribute Test 309: attributeTestClass atc = new attributeTestClass(); 310: //可用isDefined方法查看特性是否应用到了某个类上 311: Type t = atc.GetType(); 312: bool isDefined = t.IsDefined(typeof(MyAttributeAttribute), false); 313: if (isDefined) 314: Console.WriteLine("MyAttributeAttribute is applied to {0}", atc.GetType().Name); 315: //可用GetCustomAttribute方法返回应用到结构上的特性数组，实际返回了Object数组，所以需要将其强制转换为特性类型 316: object[] attrArr = t.GetCustomAttributes(false); 317: foreach(Attribute a in attrArr) 318: { 319: MyAttributeAttribute attr = a as MyAttributeAttribute; 320: if( null!=attr ) 321: { 322: Console.WriteLine("Description:{0}", attr.Description ); 323: Console.WriteLine("Version Number:{0}", attr.ver); 324: Console.WriteLine("Reviewer ID:{0}", attr.Reviewer); 325: } 326: } 327: 328: Console.ReadLine(); 329: } 330: } 331: }