WinRT知识积累2之MessageDialog应用代码

 private void NavigationHelper_SaveState(object sender, SaveStateEventArgs e)
         {
             // TODO: 在此处保存页面的唯一状态。
             ApplicationDataContainer localsetting = Windows.Storage.ApplicationData.Current.LocalSettings;
             if ((String)localsetting.Values["AppCourt"] == "")
             {
                 localsetting.Values["AppCourt"] = "";
                 showMessageBox();
             }
             else if (localsetting.Values.ContainsKey("AppCourt"))
             {
                 localsetting.Values["AppCourt"] =(int.Parse((String)localsetting.Values["AppCourt"])+).ToString();
             }
             else
             {
                 localsetting.Values["AppCourt"] = "";
             }
         }
         async void  showMessageBox()
         {
             MessageDialog messagedialog = new MessageDialog("给个好评鼓励开发=_=");
             messagedialog.Commands.Add(new UICommand("好评",new UICommandInvokedHandler(this.CommandRateInvokedHandler)));
             messagedialog.Commands.Add(new UICommand("取消"));
             await messagedialog.ShowAsync();
         }