Transparent border of windows form

Question

Hi , I need to make the border area of a windows form transparent . I have tried several approaches but failed to get the working one as mostly they are for the whole form not for the border area . pls suggest me the approach as I am not good in GDI .
This is what I am looking for . You can see the blurry effect on the border of the Windows form below (when hover on text files ) .

Answer 1

Hi,

I'm afraid it is hard to do with Winform itself. Need to draw semi-transparent border by yourself.

The Winform style you provided in picture is Aero style.
It was used in Win7 by default and has been deprecated.
Since you're drawing the non-client area, this requires the DWM api.

Currently DwmSetWindowAttribute DWMWA_BORDER_COLOR does not support ARGB.

DwmEnableBlurBehindWindow

Beginning with Windows 8, calling this function doesn't result in the blur effect, due to a style change in the way windows are rendered.

Best regards,

Minxin Yu

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