C#中4种深拷贝方法介绍

1：利用反射实现

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;
}

2：利用xml序列化和反序列化实现

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：利用二进制序列化和反序列化实现

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;
}

4：利用silverlight datacontractserializer实现，用于在silverlight 客户端使用

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;

补充：第一个已经通过递归实现了深拷贝。