Xml序列化去掉命名空间，去掉申明

#region 序列化
        /// <summary>
        /// 序列化
        /// </summary>
        /// <param name="type">类型</param>
        /// <param name="obj">对象</param>
        /// <returns></returns>
        public  string Serializer(Type type, object obj)
        {
            MemoryStream Stream = new MemoryStream();
            XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
            ns.Add("", "");//把命名空间设置为空，这样就没有命名空间了
            XmlSerializer xml = new XmlSerializer(type);
            try
            {
                //序列化对象
                xml.Serialize(Stream, obj,ns);
            }
            catch (InvalidOperationException)
            {
                throw;
            }
            Stream.Position = 0;
            StreamReader sr = new StreamReader(Stream);
            string str = sr.ReadToEnd();

            sr.Dispose();
            Stream.Dispose();

            return str;
        }

        #endregion

  public static string ObjectToXmlSerializer(Object Obj)
        {
            XmlWriterSettings settings = new XmlWriterSettings();
            //去除xml声明
            settings.OmitXmlDeclaration = true;
            settings.Encoding = Encoding.Default;
            System.IO.MemoryStream mem = new MemoryStream();
            using (XmlWriter writer = XmlWriter.Create(mem, settings))
            {
                //去除默认命名空间xmlns:xsd和xmlns:xsi
                XmlSerializerNamespaces ns = new XmlSerializerNamespaces();
                ns.Add("", "");
                XmlSerializer formatter = new XmlSerializer(Obj.GetType());
                formatter.Serialize(writer, Obj, ns);
            }
            return Encoding.Default.GetString(mem.ToArray());
        }
源网址：http://www.cnblogs.com/kissdodog/archive/2013/12/10/3468385.html