动态修改配置文件节点

 ///<summary>
     /// 更新某个节点中的值
     ///</summary>
    private void updata()
    {
        XmlDocument xmlDoc = new XmlDocument();

        xmlDoc.Load(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);

        foreach (XmlElement element in xmlDoc.DocumentElement)
        {
            if (element.Name.Equals("appSettings"))
            {
                foreach (XmlNode node in element.ChildNodes)
                {
                    if (node.Attributes[0].Value.Equals("t5"))
                    {
                        node.Attributes[1].Value = "aaaa";
                    }
                }
            }
        }
        xmlDoc.Save(AppDomain.CurrentDomain.SetupInformation.ConfigurationFile);

        ConfigurationManager.RefreshSection("appSettings");   //强制加载新的 配置文件
    }

 ///<summary>
/// 查看
///</summary>
    private void showconfig()
    {
        foreach (string key in ConfigurationManager.AppSettings)    //遍历得到所有 appsetting 节点
        {
            string value = ConfigurationManager.AppSettings[key];
            Response.Write(string.Format("key:{0},value:{1}", key, value)+"<br>");
        }
            
    }