Question

如何通过单击绑定到WPF中列表视图控件的上下文菜单来获取所选项目？

这是我的标记：

<ListView Name="lvCustomerJobs">
    <ListView.ContextMenu>
        <ContextMenu>
            <MenuItem Header="Remove"
                Click="cmCustomerRemoveJob"
                Command="{Binding RemoveItem}"
                CommandParameter="{Binding RelativeSource={RelativeSource AncestorType=ContextMenu}, 
                Path=PlacementTarget.SelectedItem}" />
        </ContextMenu>
    </ListView.ContextMenu>
    <ListView.View>
        <GridView>
            <GridViewColumn Header="Status" Width="150" DisplayMemberBinding="{Binding Status}" />
            <GridViewColumn Header="Booked in by" Width="150" DisplayMemberBinding="{Binding BookedInBy}" />
            <GridViewColumn Header="Date Required" Width="150" DisplayMemberBinding="{Binding DateRequired}" />
        </GridView>
    </ListView.View>
</ListView>

这是我背后的代码：

private void cmCustomerRemoveJob(object sender, RoutedEventArgs e)
{
    var item = ((FrameworkElement)e.OriginalSource).DataContext as User;
    if (item != null)
    {
        MessageBox.Show(item.DateRequired +  " Item's Double Click handled!");
    }
}

但是项目是否为空？

Answer 1

您应该将sender对象投射到MenuItem，然后像这样使用CommandParameter：

private void cmCustomerRemoveJob(object sender, RoutedEventArgs e)
{
    var item = ((MenuItem)sender).CommandParameter as User;
    if (item != null)
    {
        MessageBox.Show(item.DateRequired + " Item's Double Click handled!");
    }
}

Answer 2

我将ListView绑定到模型中的集合，并将SelectedItem绑定到模型。

<ListView ItemSource="{Binding CustomerCollection}" SelectedItem="{Binding SelectedCustomer}">

然后，我的命令方法可以根据需要引用SelectedCustomer。

如果出于某种原因这不理想，我很想知道！

右键单击上下文菜单后选择“项目”

2 个答案: