网格中的空列，RowCommand 中的 selecteditem null

Question

我有一个数据网格，一些列显示为空白，来自代码隐藏的空值。右键单击列，我们通过获取所选行来执行操作。万一我们在列中有空值，然后右键单击，rowcommand 中的行是空白的。

知道吗，如何在 selecteditem 为 null 时仍然获取行？

XAML :

 <DataGrid>
     <DataGrid.Columns>
         <DataGridTextColumn></DataGridTextColumn>
     </DataGrid.Columns>
      <DataGrid.ContextMenu>
          <ContextMenu>
               <MenuItem Header="Edit" ToolTip="Edit the inputs."                             
                    Command="{Binding DataContext.MenuEditRowCommand,RelativeSource={RelativeSource Mode=FindAncestor,AncestorType=ContextMenu}}"                             
                    CommandParameter="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType={x:Type ContextMenu}}, Path=PlacementTarget.SelectedItem}">

               </MenuItem>
         </ContextMenu>
     </DataGrid.ContextMenu>
</DataGrid>

视图模型：

public ICommand MenuEditRowCommand
{
    get
    {
        if (_menuEditRowCommand == null)
        {
            _menuEditRowCommand = new ExceptionHandlingDelegateCommand<Class_NAme>(MenuEditRowMethod);
        }
        return _menuEditRowCommand;
    }
}

private void MenuEditRowMethod(Class_NAme Inputs)
{
    if (Inputs != null)
    {
        //
    }

}

Answer 1

为 DataGridRow 容器定义一个 ContextMenu 并绑定到它的 DataContext:

<DataGrid>
    <DataGrid.Columns>
        <DataGridTextColumn></DataGridTextColumn>
    </DataGrid.Columns>
    <DataGrid.RowStyle>
        <Style TargetType="DataGridRow">
            <Setter Property="Tag" Value="{Binding Path=DataContext.MenuEditRowCommand, RelativeSource={RelativeSource AncestorType=DataGrid}}" />
            <Setter Property="ContextMenu">
                <Setter.Value>
                    <ContextMenu>
                        <MenuItem Header="Edit" ToolTip="Edit the inputs."                             
                                          Command="{Binding Path=PlacementTarget.Tag, RelativeSource={RelativeSource AncestorType=ContextMenu}}"                             
                                          CommandParameter="{Binding Path=PlacementTarget.DataContext, RelativeSource={RelativeSource AncestorType=ContextMenu}}">
                        </MenuItem>
                    </ContextMenu>
                </Setter.Value>
            </Setter>
        </Style>
    </DataGrid.RowStyle>
</DataGrid>

网格中的空列，RowCommand 中的 selecteditem null

Empty column in grid, selecteditem null in RowCommand

wpf

datagrid

contextmenu

selecteditem