private async void PART_Stepper_ContinueNavigation(object sender, MaterialDesignExtensions.Controls.StepperNavigationEventArgs args)
        {
            int idx = 0;

            for (; idx < PART_Stepper.Controller.Steps.Length; ++idx)
            {
                if (args.CurrentStep == PART_Stepper.Controller.Steps[idx])
                {
                    break;      // 确定现在在哪个Step
                }
            }
            if (idx == 0)
            {
                // 发送申请
                ApplicationMaterialListViewModel selected = (ApplicationMaterialListViewModel)MaterialSelectListBox.SelectedItem;
                if (selected == null)
                {
                    MainWindow.SetSnackBarContentAndPopup("请选择要申请的物资");
                    args.Cancel = true;
                    return;
                }
                else if (QuantityInputBox.Value == null || QuantityInputBox.Value <= 0)
                {
                    MainWindow.SetSnackBarContentAndPopup("不合法的数目");
                    args.Cancel = true;
                    return;
                }
                else if (QuantityInputBox.Value > selected.Constraint)
                {
                    MainWindow.SetSnackBarContentAndPopup("超出数量限制");
                    args.Cancel = true;
                    return;
                }

                NewApplicationResponse response = await NetworkHelper.GetAsync(new NewApplicationRequest()
                {
                    MaterialId = selected.OriginItem.Id,
                    Quantity   = (int)QuantityInputBox.Value,
                    Address    = UserInfo.HomeAddress
                }).Progress(ParentWindow.PART_ProgressBar);

                ApplicationViewModel       = new ApplicationListViewModel(response.Item);
                ApplicationDetailViewModel = new ApplicationDetailViewModel(await NetworkHelper.GetAsync(new GetApplicationDetailRequest()
                {
                    ApplicationId = ApplicationViewModel.OriginalItem.ID
                }).Progress(ParentWindow.PART_ProgressBar));
                RefreshApplicationCardView();
            }
            else if (idx == 3)
            {
                // 确认
                await NetworkHelper.GetAsync(new ConfirmApplicationDoneRequest()
                {
                    ApplicationId = ApplicationViewModel.OriginalItem.ID
                });
            }
        }
        private void MaterialSelectListBox_SelectionChanged(object sender, SelectionChangedEventArgs e)
        {
            ApplicationMaterialListViewModel selected = (ApplicationMaterialListViewModel)MaterialSelectListBox.SelectedItem;

            if (selected != null)
            {
                MaterialNameTextBlock.Text = selected.Name;
                QuantityInputBox.QuantityConstraintHint = $"限量{selected.Constraint}";
                MaterialDetailTextBlock.Text            = selected.Description;
            }
            else
            {
                MaterialNameTextBlock.Text = "请选择想要申请的物资";
            }
        }