如何在gridCell中使用ContextMenu？

Question

我有一个这样的CustomControl：

        <Button Name="b"  Height="20" Click="b_Click"  Content="operation" Width="60">
         <Button.ContextMenu> 
             <ContextMenu>

                <MenuItem Header="Copy"></MenuItem>
                <MenuItem Header="cut"></MenuItem>
                <MenuItem Header="delete"></MenuItem>
            </ContextMenu>
         </Button.ContextMenu> 

        </Button>

在CodeBehind ia中：

   if (b.ContextMenu != null && b.ContextMenu.IsOpen == false)
               {
                    b.ContextMenu.PlacementTarget = b;
                    b.ContextMenu.Placement = System.Windows.Controls.Primitives.PlacementMode.Bottom;
                   ContextMenuService.SetPlacement(b, System.Windows.Controls.Primitives.PlacementMode.Bottom);
                   b.ContextMenu.IsOpen = true;//I have error in this Line
                }

我在DataGrid单元中的控制中使用...当我单击按钮时，此行出现错误

 b.ContextMenu.IsOpen = true;

“ ContextMenu”不能具有逻辑或可视父级

我该如何解决这个问题

Answer 1

一个可运行的应用程序示例，希望它能为您提供所需的提示...

<DataGrid Margin="0,0,195,72" x:Name="A"> 
            <DataGrid.Resources>
                <ContextMenu x:Key="ContextMenu">
                    <MenuItem Header="Copy" Click="MenuItem_Click"></MenuItem>
                    <MenuItem Header="cut" Click="MenuItem_Click"></MenuItem>
                    <MenuItem Header="delete" Click="MenuItem_Click"></MenuItem>
                </ContextMenu>
            </DataGrid.Resources>

            <DataGrid.CellStyle>
                <Style TargetType="{x:Type DataGridCell}">
                    <Setter Property="ContextMenu" Value="{StaticResource ContextMenu}">
                                           </Setter>
                </Style>
            </DataGrid.CellStyle>
            <DataGrid.Columns>
                <DataGridTextColumn Header="A" Binding="{Binding}">

                </DataGridTextColumn>
            </DataGrid.Columns>
        </DataGrid>