在 XAML 中设置 WPF ContextMenu 的 PlacementTarget 属性? [英] Setting a WPF ContextMenu's PlacementTarget property in XAML?

问题描述

<Button Name="btnFoo" Content="Foo" >
    <Button.ContextMenu Placement="Bottom" PlacementTarget="btnFoo">
        <MenuItem Header="Bar" />
    </Button.ContextMenu>
</Button>

给我一​​个运行时错误UIElement"类型没有公共 TypeConverter 类

gives me a runtime error 'UIElement' type does not have a public TypeConverter class

我也试过

<Button Name="btnFoo" Content="Foo" >
    <Button.ContextMenu Placement="Bottom" PlacementTarget="{Binding ElementName=btnFoo}">
        <MenuItem Header="Bar" />
    </Button.ContextMenu>
</Button>

然后将 ContextMenu 放在屏幕的左上角，而不是按钮

and that put the ContextMenu in the top left corner of my screen, rather than at the Button

推荐答案

您应该在按钮上设置 ContextMenuService.Placement 附加属性，如 ContextMenu.Placement.

You should be setting the ContextMenuService.Placement attached property on the button, as stated in the remarks in the documentation for ContextMenu.Placement.

<Button Name="btnFoo" Content="Foo" ContextMenuService.Placement="Bottom">
    <Button.ContextMenu>
        <ContextMenu>
            <MenuItem Header="Bar" />
        </ContextMenu>
    </Button.ContextMenu>
</Button>

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