//四种深拷贝方法

        public static T DeepCopyByReflect<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, DeepCopyByReflect(field.GetValue(obj))); }

                catch { }

            }

            return (T)retval;

        }

        public static T DeepCopyByXml<T>(T obj)

        {

            object retval;

            using (MemoryStream ms = new MemoryStream())

            {

                XmlSerializer xml = new XmlSerializer(typeof(T));

                xml.Serialize(ms, obj);

                ms.Seek(, SeekOrigin.Begin);

                retval = xml.Deserialize(ms);

                ms.Close();

            }

            return (T)retval;

        }

        public static T DeepCopyByBin<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(, SeekOrigin.Begin);

                //反序列化成对象

                retval = bf.Deserialize(ms);

                ms.Close();

            }

            return (T)retval;

        }

        //需要silverlight支持

        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(, SeekOrigin.Begin);

                retval = ser.ReadObject(ms);

                ms.Close();

            }

            return (T)retval;

        }