Question

我在WPF PRISM项目中有用户控件，从按钮单击按钮（命令绑定）后面调用函数：

private async void UpdateStoreSet()
        {
            List<ValidationData> failedData = await _adapter.UpdateStoreSetData(this.DataList.Result as List<StoreSetData>);

            if (failedData != null && failedData.Count > 0)
            {
                FailedValidationViewModel objFaliedVM = new FailedValidationViewModel(_errorHandler, _dlgService, failedData);
                //objFaliedVM.DataList = failedData;
                Windows.FailedValidation win = new Windows.FailedValidation(objFaliedVM, _errorHandler);
                win.Owner = System.Windows.Application.Current.MainWindow;
                win.WindowStartupLocation = System.Windows.WindowStartupLocation.CenterOwner;
                win.ShowDialog();
                //_dlgService.ShowMessageBox(failedData.Count.ToString() + " records failed validation!", "Failure", MessageBoxButton.OK, MessageBoxImage.Error);
            }
            else
            {
                // Refresh the list
                SearchPlanograms();
            }
        }

在构造函数Window View Model中，这里写着：

public FailedValidationViewModel(IErrorHandlerService inErrorHandler, IDialogService inDlgService, List<ValidationData> lstFailedList)
        {
            // Set dependency injected services to local variables
            _errorHandler = inErrorHandler;            
            _dlgService = inDlgService;

            //Instantiate the failed validation list
            DataList = lstFailedList;

            // Instantiate the command
            this.ExportToExcelCommand = new DelegateCommand<object>(this.ExportToExcel);
        }

        #endregion

        #region Properties

        public List<ValidationData> DataList
        {
            get
            {
                return _failedValidation;
            }
            set
            {
                if (_failedValidation != value)
                {
                    SetProperty(ref _failedValidation, value);
                }
            }
        }

        #endregion

以下网格显示在窗口中：

<dxg:GridControl x:Name="gridFailedFloorplans" Grid.Row="0" AutoGenerateColumns="None"
            ItemsSource="{Binding DataList.Result.View}" AutoExpandAllGroups="True" DefaultSorting="Name"                         
            dx:ThemeManager.Theme="Default" Height="350" Width="580">
            <dxg:GridControl.View>
                <dxg:TableView AllowGrouping="True" ShowGroupPanel="False" AllowEditing="False" AutoWidth="True" Name="gridFailedValidationTableView"/>
            </dxg:GridControl.View>            
            <dxg:GridControl.Columns>
                <dxg:GridColumn FieldName="abc" />
                <dxg:GridColumn FieldName="def" />
                <dxg:GridColumn FieldName="efg" />
                <dxg:GridColumn FieldName="ghi" />
                <dxg:GridColumn FieldName="jkl FixedWidth="True" Width="100" />
                <dxg:GridColumn FieldName="mmm" FixedWidth="True" Width="100" />                
            </dxg:GridControl.Columns>
        </dxg:GridControl>

但是，如果ItemsSource = null，则网格将显示为空。我不知道如何解决它。请帮忙。

Answer 1

不应该绑定

<dxg:GridControl ....
        ItemsSource="{Binding DataList}"

否则它的＆＃39;在Result上寻找属性List<ValidationData>，该属性不存在并导致空itemsSource。

将用户控件的列表传递给窗口

1 个答案: