private async void ButtonClickFunction2() { var eve_data = Select_event; var result = await App.Current.MainPage.DisplayAlert("取消參加活動確認", $"是否確認取消參加活動:{eve_data.title}?", "是", "否"); if (result) { var response = await service.CancelEventRequest(eve_data.slug); switch (response.Item1) { case 1: Select_event.Participate = false; Par_show = !Par_show; Cal_show = !Cal_show; break; case 2: case 3: await App.Current.MainPage.DisplayAlert("錯誤", response.Item2, "確定"); break; default: break; } } }