用Json 讀寫設定餐數檔

先設一個class

 //程式參數設定
    public class AppSetParam
    {
        public string MvcUrl = @"localhost";
        public bool TestF = false;
    }

  string App_Path = System.AppDomain.CurrentDomain.BaseDirectory;
            string Set_name = "_Set.txt";
            string set_file = App_Path + "\\" + Set_name;
            //讀寫參數 
            AppSetParam MySet;
            if (!File.Exists(set_file))//不在 就 建立 Json
            {
                MySet = new AppSetParam();
                string JsonStr = JsonConvert.SerializeObject(MySet);
                File.WriteAllText(set_file, JsonStr);
            }
            else
            {
                string RR = File.ReadAllText(set_file);
                MySet = JsonConvert.DeserializeObject<AppSetParam>(RR);
                //string ss = MySet.MvcUrl;
                 
            }