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C # WPF transparency over Winform controls

I have a WPF control that I would like to apply to a WinForms application. Therefore, I dutifully created an element node that can display 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>

The problem is that the controls in the WinForm form are not displayed, and WPF just erases them on the screen.

An element host is created as follows:

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

Is there something I have to do, but Im not?

Are there any known issues with transparent WPF control over Winforms?

Any article that might help?

Note. This question is related to this question.

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c # controls winforms transparency wpf
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4 answers

I think you are faced with a problem of airspace . AFAIK, you cannot mix WPF transparency and ElementHost transparency, since ElementHost owns airspace.

There is a short message in the link about creating non-rectangular hwnds to host WPF content, and this may help you in the future.

Perhaps you can consider migrating more WinForms applications to WPF?

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You should read the following: Black background before loading wpf controll when using ElementHost Just hide and show it (not cool, but it works)

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You've probably tried this already, but what about setting transparency in the user control?

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This seems like an airspace issue.

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