（转载）读取xml中的指定节点的值

        /// <summary> 

       /// 读取xml中的指定节点的值

       /// </summary> 

       private string ReadXmlNode(string filename)

       {

           string result = "-1";

           XmlDocument xmlDoc = new XmlDocument();

           try

           {

               xmlDoc.LoadXml(filename);

               //读取Activity节点下的数据。SelectSingleNode匹配第一个Activity节点

               XmlNode root = xmlDoc.SelectSingleNode("//head");//当节点Workflow带有属性是，使用SelectSingleNode无法读取       

               if (root != null)

                   result = (root.SelectSingleNode("code")).InnerText;

 

           }

           catch //(Exception e)

           {

               //显示错误信息

           }

           return result;

       }