来自 ContextMenu 中 MenuItem 的 ElementName 绑定 [英] ElementName Binding from MenuItem in ContextMenu

问题描述

是否有其他人注意到 ContextMenu 对象中包含的 MenuItem 对象无法正确解析 ElementName 的绑定?查看此示例:

Has anybody else noticed that Bindings with ElementName do not resolve correctly for MenuItem objects that are contained within ContextMenu objects? Check out this sample:

<Window x:Class="EmptyWPF.Window1"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Title="Window1" Height="300" Width="300"
    x:Name="window">
    <Grid x:Name="grid" Background="Wheat">
        <Grid.ContextMenu>
            <ContextMenu x:Name="menu">
                <MenuItem x:Name="menuItem" Header="Window" Tag="{Binding ElementName=window}" Click="MenuItem_Click"/>
                <MenuItem Header="Grid" Tag="{Binding ElementName=grid}" Click="MenuItem_Click"/>
                <MenuItem Header="Menu" Tag="{Binding ElementName=menu}" Click="MenuItem_Click"/>
                <MenuItem Header="Menu Item" Tag="{Binding ElementName=menuItem}" Click="MenuItem_Click"/>
            </ContextMenu>
        </Grid.ContextMenu>
        <Button Content="Menu" 
                HorizontalAlignment="Center" VerticalAlignment="Center" 
                Click="MenuItem_Click" Tag="{Binding ElementName=menu}"/>
        <Menu HorizontalAlignment="Center" VerticalAlignment="Bottom">
            <MenuItem x:Name="anotherMenuItem" Header="Window" Tag="{Binding ElementName=window}" Click="MenuItem_Click"/>
            <MenuItem Header="Grid" Tag="{Binding ElementName=grid}" Click="MenuItem_Click"/>
            <MenuItem Header="Menu" Tag="{Binding ElementName=menu}" Click="MenuItem_Click"/>
            <MenuItem Header="Menu Item" Tag="{Binding ElementName=anotherMenuItem}" Click="MenuItem_Click"/>
        </Menu>
    </Grid>
</Window>

除了 ContextMenu 中包含的绑定之外，所有绑定都运行良好.它们在运行时将错误打印到输出窗口.

All of the bindings work great except for the bindings contained within the ContextMenu. They print an error to the Output window during runtime.

有人知道任何变通方法吗?这是怎么回事?

Any one know of any work arounds? What's going on here?

推荐答案

我找到了一个更简单的解决方案.

I found a much simpler solution.

在 UserControl 后面的代码中:

In the code behind for the UserControl:

NameScope.SetNameScope(contextMenu, NameScope.GetNameScope(this));

这篇关于来自 ContextMenu 中 MenuItem 的 ElementName 绑定的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！