如何获取xml任意节点中某个属性值



public string GetXmlNodeValue(string strXml,string strNodeName,string strValueName)
    {powered by 25175.net
        try 
        {
            System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
            xmlDoc.LoadXml(strXml);
            System.Xml.XmlNode xNode = xmlDoc.SelectSingleNode("//" + strNodeName + "");
            string strValue = xNode.Attributes[strValueName].Value;
            return strValue;
        }
        catch (Exception ex)
        {
            return ex.Message;
        }
        
    }