第一次写啊，各位多多包涵，多给些鼓励！谢谢!
刚开始做net程序，要对项目配置文件app.comfig进行读写操作下面两个方法分别完成读写操作.
//读
public static string GetValue(string AppKey)
{
try
{
string AppKeyValue;
AppKeyValue=System.Configuration.ConfigurationSettings.AppSettings.Get(AppKey);
return AppKeyValue;
}
catch(Exception ex)
{
throw ex;
}
}
//写
public static void SetValue(string AppKey,string AppValue)
{
//System.Configuration.ConfigurationSettings.AppSettings.Set(AppKey,AppValue);
XmlDocument xDoc = new XmlDocument();
xDoc.Load(System.Windows.Forms.Application.ExecutablePath + ".config");
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(System.Windows.Forms.Application.ExecutablePath + ".config");
}
看到第二个方法中注释掉的那一行吗?本来以为可以象读一样简单的完成协定俄操作.结果,不幸,得把app.config文件当作一个普通的XML文件来进行写的操作才可以! 
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