设置在XAML一个WPF文本菜单的PlacementTarget财产？ [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的UIElement类型不具有公共的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>

和该把文本菜单中我的屏幕的左上角，而不是在按钮

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

推荐答案

您应该设置按钮上的ContextMenuService.Placement附加属性，如言论的文档中的<一说href=\"http://msdn.microsoft.com/en-us/library/system.windows.controls.contextmenu.placement.aspx\">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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