Question

我有一个datagrid; Printreport通过observable collection填充; PopulatePatternData 它运行正常，程序运行时会显示所有行。重新运行程序时，我想使用新数据行更新datagrid，而是使用之前的结果（行）添加新数据

XAML：

<DataGrid x:Name="PrintReport" ItemsSource="{Binding PopulatePatternData}" AutoGenerateColumns="False" FontFamily="Tahoma" FontSize="12" CanUserSortColumns="False"
                                                     HorizontalContentAlignment="Stretch"  VerticalContentAlignment="Stretch"  AlternatingRowBackground="Gainsboro"  AlternationCount="1" 
                                                     SelectionMode="Extended" SelectionUnit="Cell" >

我用来运行程序的按钮（RunAnalysis）有一个event handler。单击它时清除observable collection，然后创建数据网格。我试图＆＃34; clear＆＃34; datagrid行如下所示，但无济于事。

 private void RunAnalysis(object sender, RoutedEventArgs e)
        {
            WFPlanningCompliancePluginModel model = DataContext as WFPlanningCompliancePluginModel;
            model.PopulatePatternData.Clear();
            PrintReport.Items.Clear();   // This does not work         
            model.Run();
        }

collection被清除但不是datagrid！我错了什么？如果我使用

，第一次运行时程序会失败

PrintReport.Items.Clear(); as it does not find any items.

Answer 1

清除项目后重新绑定DataGrid：

private void RunAnalysis(object sender, RoutedEventArgs e)
{
    WFPlanningCompliancePluginModel model = DataContext as WFPlanningCompliancePluginModel;
    model.PopulatePatternData.Clear();

    // PrintReport.Items.Clear();   // This you can skip if the binding works.
    PrintReport.DataBind(); // This should be enough if the binding works correctly!
    model.Run();
}

WPF Datagrid行不会被清除 - C＃

1 个答案: