List集合深度拷贝方法

 /// <summary>
 /// 深拷贝方法1.需标记对象序列号-不知道标记啥的引用一次看报错信息即可
 /// </summary>
 /// <typeparam name="T"></typeparam>
 /// <param name="List">The list.</param>
 /// <returns>List{``0}.</returns>
 private List<T> Clone<T>(object List)
 {
     using (Stream objectStream = new MemoryStream())
     {
         IFormatter formatter = new BinaryFormatter();
         formatter.Serialize(objectStream, List);
         objectStream.Seek(0, SeekOrigin.Begin);
         return formatter.Deserialize(objectStream) as List<T>;
     }
 }
 /// <summary>
 /// 深拷贝方法2.无需标记对象序列号
 /// </summary>
 /// <typeparam name="T"></typeparam>
 /// <param name="obj"></param>
 /// <returns></returns>
 private List<T> DeepCopy<T>(List<T> obj)
 {
     List<T> list = new List<T>();
     foreach (var item in obj)
     {
         object retval;
         using (MemoryStream ms = new MemoryStream())
         {
             XmlSerializer xml = new XmlSerializer(typeof(T));
             xml.Serialize(ms, item);
             ms.Seek(0, SeekOrigin.Begin);
             retval = xml.Deserialize(ms);
             ms.Close();
         }
         list.Add((T)retval);
     }

     return list;
 }