如何修改 web.config 中的appSettings 的值

Question

web.config 文件为：<?xml version="1.0" encoding="utf-8" ?>
<configuration>
<appSettings>
<add key="databaseType" value="2"/>
</appSettings>
</configuration>如何修改value，例如改成value="1", 并save this file

Answer 1

#region 保存Web.config
        /// <summary>
        /// 保存Web.config
        /// </summary>
        /// <param name="strKeyName">节点名</param>
        /// <param name="strKeyValue">要保存的值</param>
        /// <param name="strWhich">哪个配置文件</param>
        public static void SaveSetting(string strKeyName, string strKeyValue, string strWhich)
        {
            //创建XML文档实例
            System.Xml.XmlDocument XMLWebSetting = new System.Xml.XmlDocument();            //打开XML文档
            XMLWebSetting.Load(System.Web.HttpContext.Current.Server.MapPath("~/" + strWhich + ""));            //查找节点所在位置
            System.Xml.XmlNodeList XmlNodeList = XMLWebSetting.SelectSingleNode("//appSettings").ChildNodes;
            try
            {
                foreach (System.Xml.XmlNode xn in XmlNodeList)
                {
                    System.Xml.XmlElement xe = ((System.Xml.XmlElement)(xn));
                    if (xe.Attributes["key"].InnerText == strKeyName)
                    {
                        xe.Attributes["value"].InnerText = strKeyValue;
                        XMLWebSetting.Save(System.Web.HttpContext.Current.Server.MapPath("~/" + strWhich + ""));
                        break;
                    }
                }
            }
            catch (System.Exception Ex)
            {
                throw Ex;
            }
        }
        #endregion使用SaveSetting("databaseType",1,"web.config");