C# Winform 修改app.config文件

<?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");
??????? }