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://*.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!

[玩转微信平台]XML的格式化- 如何去掉XML 文档头和命名空间