How to implement this in WinForm C#(Not WPF)

[rikka0w0]

I'm trying to implement this in C#, I simply replaced the handle of a WPF window with my WinForm, the blur can appear, but all those control texts becomes transparent.

Will there be any solution for this?

[riverar]

Change the TransparencyKey on the form to, say, Colors.Fuchsia and should resolve that.

[rikka0w0]

@riverar I have solved this by setting the TransparencyKey to a rarely used color on my WinForm, but another problem arised. I tried to draw a semi-transparent ellipse on my form, with the color of the TransparencyKey and alpha is set to 50%, but I get a solid shape instead of a semi-transparent one. Can you help me with this problem? Thanks so much~

[MarceSosa22]

hi i dont speak english but i will try.

I implemented in visual basic.net C #, I get the result of the image, is there a way to apply the blur only to a panel? or leave the blur in a certain area of ​​the form?

[MarceSosa22]

I clarify, the transparentkey of the form only accepts black color, it does not apply the blur with another color. my problem is the text boxes, the rest is tolerable. As you can see in the previous image, the text box is lost with the white background.

[riverar]

@marcesosa22 This composition trick does not support child hwnds (so you can't pass in a panel handle). Instead, you can set the Panel background color to Fuschia, then set the Form's TransparencyKey to Fushcia.

This:

Produces:

[riverar]

@rikka0w0

https://user-images.githubusercontent.com/475132/104390709-2afde300-54f3-11eb-8a47-8c895993a6c5.mp4

You can fiddle with the opacity via GradientColor, you can't do this at the winforms level. https://github.com/riverar/sample-win32-acrylicblur/blob/master/MainWindow.xaml.cs#L74