C＃WPF在Winform控件上的透明度 [英] c# WPF transparency over Winform controls

问题描述

我有一个WPF控件，我想将其覆盖到WinForms应用程序上。因此，我忠实地创建了一个可以显示以下WPF对象的元素主机：

I have a WPF control that I would like to overlay onto a WinForms application. So I have dutifully created a Element Host that can show the following WPF object:

<UserControl x:Class="LightBoxTest.LightBox"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    Height="300" Width="300" Background="Transparent">
    <Grid Name="dialogHolder" Background="Transparent" Opacity="1">
        <Rectangle Name="rectangle1" Stroke="White" Fill="Black" RadiusX="10" RadiusY="10" Opacity="0.5" />
        <StackPanel Name="stackPanel1" Background="Transparent" Height="300" VerticalAlignment="Top">
            <Rectangle Name="spacer" Opacity="0" Stroke="Gray" Fill="White" RadiusX="10" RadiusY="10" Height="100" Width="300" />
            <Grid Height="100" Name="contentHolder" Width="250">
                <Rectangle Name="dialog" Stroke="Gray" Fill="White" RadiusX="10" RadiusY="10" Height="100" Width="250" />
            </Grid>
        </StackPanel>
    </Grid>
</UserControl>

问题在于WinForm窗体上的控件无法呈现，而WPF只是在控件上消除了它们。屏幕。

The trouble is that the Controls on the WinForm Form do not render and the WPF just obliterates them on the screen.

元素主机的创建方式如下：

The element host is created like:

dialogHost = new ElementHost(); 
dialogHost.Child = dialog;
dialogHost.BackColorTransparent = true;
dialogHost.BringToFront();  
dialogHost.Show();

我应该做些什么吗？我不是吗？

Is there something I should be doing and Im not?

是否存在有关对Winforms显示透明的WPF控制的已知问题？

Are there known issues about showing transparent WPF controls over Winforms?

是否有任何有用的文章？

Any articals that may help?

注意：此问题与此问题

推荐答案

我认为您遇到了空域问题。 AFAIK，因为ElementHost拥有领空，所以您不能混合使用WPF透明度和ElementHost透明度。

I think you're running into an airspace issue. AFAIK, you can't mix WPF transparency and ElementHost transparency since the ElementHost owns the airspace.

链接中有一小段关于创建非矩形Hwnd来承载WPF的信息。

There's a short blurb in the link about creating non-rectangular hwnds to host WPF content, and that may get you farther.

也许您可以考虑将更多WinForms应用程序迁移到WPF？

Perhaps you can consider migrating more of the WinForms app to WPF?

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