C#中4种深拷贝方法介绍

public static T DeepCopy<T>(T obj){  //如果是字符串或值类型则直接返回  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;}

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;    }

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);    //反序列化成对象    retval = bf.Deserialize(ms);    ms.Close();  }  return (T)retval;}

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;