序列化实现 深拷贝

        private static Object DeepClone(Object original)
        {
            using (MemoryStream stream = new MemoryStream())
            {
                BinaryFormatter formatter = new BinaryFormatter();

                formatter.Context = new StreamingContext(StreamingContextStates.Clone);

                formatter.Serialize(stream, original);

                stream.Position = 0;

                return formatter.Deserialize(stream);
            }
        }