winForm 读取Web.config 包含(xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0")

 由于这个XML文件加了Xmlns命名空间,如果直接用xxx.SelectSingleNode("PersonalInformation/GeneralInformation/Name"),结果返回null; public void GetStrConnection() {     try     {         string str = AppDomain.CurrentDomain.BaseDirectory + "web.config";         System.Xml.XmlDocument webconfig = new System.Xml.XmlDocument();         webconfig.Load(str);//web.config的路径             XmlNamespaceManager xnm = new XmlNamespaceManager(webconfig.NameTable);         xnm.AddNamespace("x", "http://schemas.microsoft.com/.NetConfiguration/v2.0");         string xpath = "/x:configuration/x:connectionStrings/x:add[@name='SqlConnectionString']";          //System.Xml.XmlNode node = webconfig.SelectSingleNode("/configuration/connectionStrings/add[@name='SqlConnectionString']");//要找的节点         foreach (XmlNode node in webconfig.SelectNodes(xpath, xnm))         {             if (node == null)             {                 MessageBox.Show("没有找到符合要求的节点");             }             else             {                 ConnString = node.Attributes[1].InnerText;             }         }                       logclass.WriteLogFile("读取数据库链接字符串成功");     }     catch (Exception ex)     {         log.WriteLogFile("读取数据库链接字符串失败" + ex.Message);     } }