c# 对SOAP返回XML字符串的解析方法

<SOAP:Envelope xmlns:SOAP="http://schemas.xmlsoap.org/soap/envelope/">
<SOAP:Header/>
  <SOAP:Body>
    <ns0:MT_COMMON xmlns:ns0="http://www.db.com">
      <KEY>关键标示</KEY>
      <DATAJSON>数组内容</DATAJSON>
    </ns0:MT_COMMON>
  </SOAP:Body>
</SOAP:Envelope>

针对上面格式的XML字符串，获取出来 数组内容或关键标示

解析代码：

 try
            {
                XmlDocument xmlDoc = new XmlDocument();
                xmlDoc.LoadXml(strxml);//Load加载XML文件，LoadXML加载XML字符串
                XmlElement root = xmlDoc.DocumentElement;
                XmlNamespaceManager nsmgr = new XmlNamespaceManager(xmlDoc.NameTable);

                XmlNode xnode = root.FirstChild;
                nsmgr.AddNamespace("ns0", "http://www.db.com");
                value = xnode.SelectSingleNode("//ns0:MT_COMMON", nsmgr)
                    .SelectSingleNode("DATAJSON").InnerText;
                
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }

            return value;