200分求救 winform修改App.config

<?xml version="1.0" encoding="utf-8" ?>

<configuration>

	<connectionStrings></connectionStrings>

	<appSettings>

		<add key="Server" value=" "/>

		<add key="initial catalog" value=" "></add>

		<add key="uid" value=" "></add>

		<add key="pwd" value=" "></add>

	</appSettings>

</configuration>

#region  方法保存修改的设置

        /// <summary>

        /// 方法保存修改的设置

        /// </summary>

        /// <param name="ConnenctionString"></param>

        /// <param name="strKey"></param>

        private void SaveConfig(string ConnenctionString, string strKey)

        {

            XmlDocument doc = new XmlDocument();

            //获得配置文件的全路径

            string strFileName = AppDomain.CurrentDomain.SetupInformation.ConfigurationFile;

            doc.Load(strFileName);

            //找出名称为“add”的所有元素

            XmlNodeList nodes = doc.GetElementsByTagName("add");

            for (int i = 0; i < nodes.Count; i++)

            {

                //获得将当前元素的key属性

                XmlAttribute att = nodes[i].Attributes["key"];

                //根据元素的第一个属性来判断当前的元素是不是目标元素

                if (att.Value == strKey)

                {

                    //对目标元素中的第二个属性赋值

                    att = nodes[i].Attributes["value"];

                    att.Value = ConnenctionString;

                    break;

                }

            }

            //保存上面的修改

            doc.Save(strFileName);

        }

        #endregion 



//调用方法修改app.config文件

private void btnOK_Click_1(object sender, EventArgs e)

        {

                SaveConfig("WWW-8CB7FB23DD4","Server");

                SaveConfig("myehrce","initial catalog");

                SaveConfig("sa", "uid");

                SaveConfig("123","pwd");

        }