App.Config更改值

您不能为此使用AppSettings静态对象。尝试这个

string appPath = System.IO.Path.GetDirectoryName(Reflection.Assembly.GetExecutingAssembly().Location);          string configFile = System.IO.Path.Combine(appPath, "App.config");ExeConfigurationFileMap configFileMap = new ExeConfigurationFileMap();         configFileMap.ExeConfigFilename = configFile;          System.Configuration.Configuration config = ConfigurationManager.OpenMappedExeConfiguration(configFileMap, ConfigurationUserLevel.None);config.AppSettings.Settings["YourThing"].Value = "New Value"; config.Save();