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概述

　為什么要用到深拷貝呢？比如我們建了某個類Person，并且實例化出一個對象，然后，突然需要把這個對象復制一遍，并且復制出來的對象要跟之前的一模一樣，來看下我們一般會怎么做。

1、利用反射實現

public static T DeepCopy<T>(T obj){  //如果是字符串或值類型則直接返回  if (obj is string || obj.GetType().IsValueType) return obj;
  object retval = Activator.CreateInstance(obj.GetType());  FieldInfo[] fields = obj.GetType().GetFields(BindingFlags.Public | BindingFlags.NonPublic | BindingFlags.Instance | BindingFlags.Static);  foreach (FieldInfo field in fields)  {    try { field.SetValue(retval, DeepCopy(field.GetValue(obj))); }    catch { }  }  return (T)retval;}

2、利用xml序列化和反序列化實現

public T DeepCopy<T>(T obj)    {      object retval;      using (MemoryStream ms = new MemoryStream())      {        XmlSerializer xml = new XmlSerializer(typeof(T));        xml.Serialize(ms, obj);        ms.Seek(0, SeekOrigin.Begin);        retval = xml.Deserialize(ms);        ms.Close();      }      return (T)retval;    }

3、利用二進制序列化和反序列化實現

public static T DeepCopy<T>(T obj){  object retval;  using (MemoryStream ms = new MemoryStream())  {    BinaryFormatter bf = new BinaryFormatter();    //序列化成流    bf.Serialize(ms, obj);    ms.Seek(0, SeekOrigin.Begin);    //反序列化成對象    retval = bf.Deserialize(ms);    ms.Close();  }  return (T)retval;}

4、DataContractSerializer實現

利用silverlight DataContractSerializer實現，用于在silverlight 客戶端使用

public static T DeepCopy<T>(T obj)    {      object retval;      using (MemoryStream ms = new MemoryStream())      {        DataContractSerializer ser = new DataContractSerializer(typeof(T));        ser.WriteObject(ms, obj);        ms.Seek(0, SeekOrigin.Begin);        retval = ser.ReadObject(ms);        ms.Close();      }      return (T)retval;