DataGrid 的上下文菜单

Question

我有以下数据网格行的上下文菜单。

        <ContextMenu  x:Key="cm_rowMenu">
            <!--ContextMenu For Row-->
            <MenuItem Header="Edit Info."
                      Click="mnuEditInfo_Click"
                      />
            <MenuItem Header="Delete"
                      Click="mnuDeleteDevSoftware_Click"
                      />
            <MenuItem Header="Check In"
                      Click="mnuCheckIn_Click"
                      />
        </ContextMenu>

        <Style x:Key="DefaultRowStyle" TargetType="{x:Type dg:DataGridRow}">
            <Setter Property="ContextMenu" Value="{StaticResource cm_rowMenu}" />
        </Style>

但是，我想进行以下更改：

我希望根据 dataGrid.SelectedItem 的属性启用/禁用菜单项。我该怎么做？

此致， 麦德塞布

Answer 1

使用命令：

<ContextMenu  x:Key="cm_rowMenu" DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}">
    <MenuItem Header="Edit Info." Command="{Binding EditCommand}"/>
</ContextMenu>
<Style x:Key="DefaultRowStyle" TargetType="{x:Type DataGridRow}">
    <Setter Property="ContextMenu" Value="{StaticResource cm_rowMenu}" />
</Style>

行模型：

public class ItemModel
{
    public ItemModel()
    {
        this.EditCommand = new SimpleCommand 
        { 
            ExecuteDelegate = _ => MessageBox.Show("Execute"), 
            CanExecuteDelegate = _ => this.Id == 1 
        };
    }
    public int Id { get; set; }
    public string Title { get; set; }
    public ICommand EditCommand { get; set; }
}