读写配置文件

 ;读写配制文件操作#region;读写配制文件操作
        public string GetConfigString(string key)
        {
            return ConfigurationManager.AppSettings[key];
        }
        //没有加载时读取
        public string GetConfigValue(string appKey)
        {
            XmlDocument xDoc = new XmlDocument();
            try
            {
                xDoc.Load(System.Windows.Forms.Application.ExecutablePath + ".config");

                XmlNode xNode;
                XmlElement xElem;
                xNode = xDoc.SelectSingleNode("//appSettings");
                xElem = (XmlElement)xNode.SelectSingleNode("//add[@key='" + appKey + "']");
                if (xElem != null)
                    return xElem.GetAttribute("value");
                else
                    return "";
            }
            catch (Exception)
            {
                return "";
            }
        } 
        //写操作
        public void SetValue(string AppKey, string AppValue)
        {
            XmlDocument xDoc = new XmlDocument();
            //获取可执行文件的路径和名称
            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");
        }
        #endregion;读写配制文件操作