C# winform 修改app.config配置文件的实现类

class Configuration    {        public static string fileName=System.IO.Path.GetFileName(Application.ExecutablePath);        public static bool addSetting(string key,string value){             Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration(fileName);            config.AppSettings.Settings.Add(key, value);            config.Save();            return true;        }        public static string getSetting(string key){            Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration(fileName);            string value=config.AppSettings.Settings[key].Value;            return value;        }        public static bool updateSeeting(string key, string newValue)        {            Configuration config = System.Configuration.ConfigurationManager.OpenExeConfiguration(fileName);            string value = config.AppSettings.Settings[key].Value=newValue;            config.Save();            return true;        }    }}