Question

应用程序的主窗口有数据网格，它是从数据库填充的。（从数据表中绑定数据网格）。

数据网格有3列 -

<DataGrid.Columns>
<DataGridTextColumn Header= Id" Binding="{Binding Id}" Width="250"></DataGridTextColumn>
<DataGridTextColumn Header= Name" Binding="{Binding Name}" Width="250"></DataGridTextColumn>
<DataGridTemplateColumn Header="Action" Width="*">
         <DataGridTemplateColumn.CellTemplate>
         <DataTemplate>
         <StackPanel Orientation="Horizontal">
             <Button Name="btnEdit" Content="Edit" Width="90" Click="btnEdit_Click" />
             <Button Name="btnDelete" Content="Delete" Width="90" Click="btnDelete_Click" />
         </StackPanel>
        </DataTemplate>
       </DataGridTemplateColumn.CellTemplate>
      </DataGridTemplateColumn>
</DataGrid.Columns>

当窗口加载时，datagrid用数据表打包。

    DataTable o_DataTable = new DataTable();
    o_DataTable.Columns.Add("Id", typeof(string));
    o_DataTable.Columns.Add("Name", typeof(string));

            o_DataTable.Rows.Add("1","A");
            o_DataTable.Rows.Add("2","B");

        this.grd.ItemsSource = o_DataTable.DefaultView;

下面的删除按钮代码点击：

private void Button_Click(object sender, RoutedEventArgs e)
        {
            object item = grd.SelectedItem;
            string CourseName = (grd.SelectedCells[0].Column.GetCellContent(item) as TextBlock).Text;
            MessageBoxResult result = MessageBox.Show("Are you sure you want to delete the course " + CourseName + "?");
            if (result == MessageBoxResult.OK)
            {
                grd.Items.RemoveAt(grd.SelectedIndex);
            }
        }

当我点击删除按钮时，异常被抛出

An unhandled exception of type 'System.InvalidOperationException' occurred in PresentationFramework.dll

Additional information: Operation is not valid while ItemsSource is in use. Access and modify elements with ItemsControl.ItemsSource instead.

请任何人建议克服此错误。谢谢。

Answer 1

而不是：

grd.Items.RemoveAt(grd.SelectedIndex);

您应该从基础资源中删除。

尝试从数据表中删除它，它将从视图中消失。采用MVVM方法可以更轻松，因为您永远不需要触摸UI。

Answer 2

您想要从网格中删除项目，您可以尝试使用此方法

 private void btnDelete_Click(object sender, RoutedEventArgs e)
        {
            object item = grd.SelectedItem;
            string CourseName = (grd.SelectedCells[0].Column.GetCellContent(item) as TextBlock).Text;
            MessageBoxResult result = System.Windows.MessageBox.Show("Are you sure you want to delete the course " + CourseName + "?");
            if (result == MessageBoxResult.OK)
            {
                var itemSource = grd.ItemsSource as DataView;

                itemSource.Delete(grd.SelectedIndex);

                grd.ItemsSource = itemSource;
            }
        }

删除Datagrid行（WPF）

2 个答案: