RelayCommand 未在 DataGridTextColumn WPF MVVM 内单击 MenuItem 时触发

Question

我想在右键单击 EmpName 列上的“插入”菜单时添加新行，但它不会触发 InsertCommand。我在这里附上了 xaml 代码。请告诉我我在这里缺少什么。

<Window x:Class="DataGridRowsManagement.MainWindow"
    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:data="clr-namespace:DataGridRowsManagement"
        mc:Ignorable="d"
        Title="MainWindow" Height="450" Width="800">
    <Window.Resources>
        <data:ViewModel x:Key="EmpVM"></data:ViewModel>
    </Window.Resources>
    <Grid DataContext="{Binding Source={StaticResource EmpVM}}">
        <DataGrid AutoGenerateColumns="False" Height="287"
                  HorizontalAlignment="Left" Margin="23,12,0,0"
                  Name="dgEmp" VerticalAlignment="Top" Width="657"
                   ItemsSource="{Binding Path=Employees}" ColumnWidth="*"
                  SelectedIndex="{Binding Path=RecordIndex,Mode=TwoWay}">
            <DataGrid.Columns>
                <DataGridTextColumn  Header="EmpNo" Binding="{Binding EmpNo}" />
                <DataGridTemplateColumn Header="EmpName">
                    <DataGridTemplateColumn.CellTemplate>
                        <DataTemplate>
                            <TextBlock Text="{Binding EmpName}" HorizontalAlignment="Stretch">
                                <TextBlock.ContextMenu>
                                    <ContextMenu DataContext="{Binding PlacementTarget.DataContext, RelativeSource={RelativeSource Self}}">
    <MenuItem Command="{Binding InsertCommand}"                                      CommandParameter="{Binding RecordIndex}" Header="Insert"/>
<MenuItem Command="{Binding DeleteCommand}" CommandParameter="{Binding RecordIndex}"  Header="Delete"/>
                                    </ContextMenu>
                                </TextBlock.ContextMenu>
                            </TextBlock>
                        </DataTemplate>
                    </DataGridTemplateColumn.CellTemplate>
                </DataGridTemplateColumn>
                <DataGridTextColumn  Header="Salary" Binding="{Binding Salary}" />
                <DataGridTextColumn  Header="Designation" Binding="{Binding Designation}" />
            </DataGrid.Columns>
        </DataGrid>
    </Grid>
</Window>

Answer 1

这些绑定位于

DataTemplate

内，因此它们将尝试绑定到要模板化的项目。

尝试下一个：

<Window
...
  x:Name="ThisWindow"

<MenuItem Command="{Binding DataContext.InsertCommand, ElementName=ThisWindow}" />