[玩转微信平台]XML的格式化- 如何去掉XML 文档头和命名空间

前言

系统要求能够回复微信用户发过来的文本消息。实现中使用的实体对象进行XML的序列化的方式来实现XML消息。

微信平台的回复例子

http://mp.weixin.qq.com/wiki/14/89b871b5466b19b3efa4ada8e577d45e.html#.E5.9B.9E.E5.A4.8D.E6.96.87.E6.9C.AC.E6.B6.88.E6.81.AF

这是我测试成功后的例子

如果简单使用xml serializer会包括两个部分，就是下面第一行和第二行

<?xml version="1.0" encoding="utf-16"?>

<xml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

  <FromUserName>test</FromUserName>

  <CreateTime>0</CreateTime>

  <MsgId>0</MsgId>

</xml>


 

由于下面的两行发送给微信服务器，微信服务器会报错，因此必须要移除第一行和去掉xmlns 命名空间的字符串

<?xml version="1.0" encoding="utf-16"?>

<xml xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:xsd="http://www.w3.org/2001/XMLSchema">

最开始想简单用字串替换的方式，后来还是老老实实的用标准方法来做。给出一个完整的例子吧，拷贝吧！

public class WebChatXmlMessageSerializer : ISerializer

    {

        public string SerializeToXML(Object obj)

        {

            string outXML = string.Empty;

            if (obj == null)

                return outXML;


            XmlSerializer xs = new XmlSerializer(obj.GetType(),

    new XmlRootAttribute("xml"));


            //namsepaces is emty

            //to remove xmlns  <xml   xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">

            XmlSerializerNamespaces namespaces = new XmlSerializerNamespaces(new XmlQualifiedName[] {

        new XmlQualifiedName(string.Empty, string.Empty) // Default Namespace

    });


            // I‘ll use a MemoryStream as my backing store.

            using (MemoryStream ms = new MemoryStream())

            {


                // This is extra! If you want to change the settings for the XmlSerializer, you have to create

                // a separate XmlWriterSettings object and use the XmlTextWriter.Create(...) factory method.

                // So, in this case, I want to omit the XML declaration.

                XmlWriterSettings xws = new XmlWriterSettings();

                xws.OmitXmlDeclaration = true;

                xws.Encoding = Encoding.UTF8; // This is probably the default

                //equal writer.Formatting = Formatting.Indented;

                xws.Indent = true;


                var xwr = XmlTextWriter.Create(ms, xws);

                // remove <?xml header

                //http://stackoverflow.com/questions/7913798/xmlserializer-to-xelement

                ms.Position = 0;

                xs.Serialize(xwr, obj, namespaces);



                outXML = System.Text.Encoding.UTF8.GetString(ms.ToArray());

            }


            return outXML;




        }


        public T DeSeriralze<T>(string xmlStr)

        {


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



            object recoveryObject = null;

            StringReader sr = null;



            try

            {

                sr = new StringReader(xmlStr);

                //默认用UTF-8打开文件



                recoveryObject = xmS.Deserialize(sr);

            }

            catch (Exception ex)

            {

                throw ex;

            }

            finally

            {

                if (sr != null)

                    sr.Close();

            }

            return (T)recoveryObject;

        }



    }

重点我标记如下：

Enjoy it!