c# 实现深层复制的3中方法

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;

}