读写xml文件的2个小函数，2005 4 2 by hyc #region 读写xml文件的2个小函数，2005 4 2 by hyc 
//写xmlPath是文件路径+文件名，AppKey是 Key Name，AppValue是Value public void SetXmlFileValue(string xmlPath,string AppKey,string AppValue) 
...{ XmlDocument xDoc = new XmlDocument(); xDoc.Load(xmlPath); XmlNode xNode; XmlElement xElem1; XmlElement xElem2; xNode = xDoc.SelectSingleNode("//appSettings"); xElem1 = (XmlElement)xNode.SelectSingleNode("//add[@key='" + AppKey + "']"); if ( xElem1 != null ) ...{ xElem1.SetAttribute("value",AppValue); 
} else ...{ xElem2 = xDoc.CreateElement("add"); xElem2.SetAttribute("key",AppKey); xElem2.SetAttribute("value",AppValue); xNode.AppendChild(xElem2); } xDoc.Save(xmlPath); } //读xmlPath是文件路径+文件名，AppKey是 Key Name，AppValue是Value public void GetXmlFileValue(string xmlPath,string AppKey,ref string AppValue) ...{ XmlDocument xDoc = new XmlDocument(); xDoc.Load(xmlPath); XmlNode xNode; XmlElement xElem1; xNode = xDoc.SelectSingleNode("//appSettings"); xElem1 = (XmlElement)xNode.SelectSingleNode("//add[@key='" + AppKey + "']"); if ( xElem1 != null ) ...{ AppValue=xElem1.GetAttribute ("value"); } else ...{ // MessageBox.Show ("There is not any information!"); } } 
#endregion