给xml|web.config 增加节点和属性值

string basePathConfig = this.Request.PhysicalApplicationPath.ToString()+"Web.config";
            XmlDocument xmlDoc = new XmlDocument();
            xmlDoc.Load(basePathConfig); //加载你的XML文件
            XmlNode appSettings = xmlDoc.SelectSingleNode("/configuration/appSettings");//查找appSettings
            XmlElement adds=xmlDoc.CreateElement("add");//创建add节点
            adds.SetAttribute("key","test");
            adds.SetAttribute("value","testvalue");
            appSettings.AppendChild(adds);   //追加节点
            xmlDoc.Save(basePathConfig);//保存文件
            Response.Write("success");成功提示

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