c# 修改winform中app.config的配置值

     public bool ChangeConfig(string AppKey,string AppValue)
        {
            bool result = true;
            try
            {
                XmlDocument xDoc = new XmlDocument();
                //获取App.config文件绝对路径
                String basePath = System.AppDomain.CurrentDomain.SetupInformation.ApplicationBase;
                basePath = basePath.Substring(0, basePath.Length - 10);
                String path = basePath + "App.config";
                xDoc.Load(path);

                XmlNode xNode;
                XmlElement xElem1;
                XmlElement xElem2;
                //修改完文件内容,还需要修改缓存里面的配置内容,使得刚修改完即可用
                //如果不修改缓存,需要等到关闭程序,在启动,才可使用修改后的配置信息
                Configuration cfa = ConfigurationManager.OpenExeConfiguration(ConfigurationUserLevel.None);
                xNode = xDoc.SelectSingleNode("//appSettings");
                xElem1 = (XmlElement)xNode.SelectSingleNode("//add[@key='" + AppKey + "']");
                if (xElem1 != null)
                {
                    xElem1.SetAttribute("value", AppValue);
                    cfa.AppSettings.Settings[AppKey].Value = AppValue;
                }
                else
                {
                    xElem2 = xDoc.CreateElement("add");
                    xElem2.SetAttribute("key", AppKey);
                    xElem2.SetAttribute("value", AppValue);
                    xNode.AppendChild(xElem2);
                    cfa.AppSettings.Settings.Add(AppKey, AppValue);
                }
                //改变缓存中的配置文件信息(读取出来才会是最新的配置)
                cfa.Save();
                ConfigurationManager.RefreshSection("appSettings");
                xDoc.Save(path);
            }
            catch (Exception ex)
            {
                _log.Error("修改App.config文件出错:"+ex.Message);
                result = false;
            }
            return result;
        }

 

转载于:https://www.cnblogs.com/25miao/p/7206984.html

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