Question

我有一个包含对象集合和一堆命令的视图模型。

public class MainWindowVM : NotifyPropertyChangedBase
{
    private CollectionViewSource employeeViewSource;

    private ICommand cmdOpenDetailEmployee;

    public MainWindowVM()
    {
        nsDataProviderEmployees = new NSDataProvider();

        employeeViewSource = new CollectionViewSource();

        cmdOpenDetailEmployee = new RelayCommand<object>((parameter) => {...});

        this.LoadData();
    }

    public CollectionViewSource EmployeeViewSource => employeeViewSource;
    public ICommand CmdOpenDetailEmployee => cmdOpenDetailEmployee;
}

在我的应用程序中，我想在显示员工的数据网格的上下文菜单中使用此命令。

<Window
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:MyApp.UI"
        xmlns:DataModel="clr-namespace:MyApp.DataModel;assembly=MyApp.DataModel" x:Class="MyApp.UI.MainWindow"
        xmlns:vm="clr-namespace:MyApp.UI.ViewModels"
        mc:Ignorable="d"
        Title="MyApp - Main" Height="751.826" Width="1111.005" Loaded="Window_Loaded" Icon="Resources/MyApp.ico">
    <Window.DataContext>
        <vm:MainWindowVM />
    </Window.DataContext>
    <Grid x:Name="grdMain">
        <DataGrid DataContext="{Binding Path=EmployeeViewSource}" x:Name="employeeDataGrid" EnableRowVirtualization="True" ItemsSource="{Binding}" Margin="10,77,10,0" RowDetailsVisibilityMode="VisibleWhenSelected">
            <DataGrid.ContextMenu>
                <ContextMenu DataContext="{Binding RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}}">
                    <MenuItem Header="OpenDetail..."
                              Command="{Binding CmdOpenDetailEmployee}"
                              CommandParameter="{Binding}"/>
                </ContextMenu>
            </DataGrid.ContextMenu>
            <DataGrid.Columns>...</DataGrid.Columns>

        </DataGrid>
    </Grid>
</Window>

问题，我无法提出绑定的组合，这两种绑定都使我无法将EmployeeViewSource属性或ViewModel用作网格的DataContext和{{1} }属性，作为ContextMenu和MenuItems的DataContext。

根据所有帖子，我已经找到了这个应该的方法，但是单击菜单项时未执行命令。

Answer 1

绑定到DataContext的{{1}}的{{1}}，然后让PlacementTarget从窗口继承其ContextMenu：

DataGrid

覆盖父级中的DataContext后，在子元素中使用Window DataContext

1 个答案: