Graphics's dpi not refreshing at runtime in c#

Asked Mar 29 '21 at 10:52

Active Mar 29 '21 at 12:04

Viewed 126 times

I am always checking Graphics.FromHwnd(IntPtr.Zero).DpiX value and scaling my component with this value. But when I change my scale rate on "Windows Display Settings" while the application is running, Graphics still looks same. Dpi value could not updated at runtime.

Scaling is 100% at the beginning > Application has been started > DpiX is 98 > Scaling changed to 150% > DpiX is still 98, but it should be 144.

Is there any way to find current dpi or scale rate?

edited Mar 29 '21 at 12:04

asked Mar 29 '21 at 10:52

Görkem Hacıoğlu

You handle is always IntPtr.Zero. I think you want to get the handle number from the control object like this.Handle which would be the form handle. – jdweng Mar 29 '21 at 11:09
Still same with this.Handle – Görkem Hacıoğlu Mar 29 '21 at 11:25
The control you are using to view the image probably isn't getting refresh. – jdweng Mar 29 '21 at 11:35
Yes, that's the problem. I refreshed the control but nothing changed. I don't want to restart the app to get updated dpi. – Görkem Hacıoğlu Mar 29 '21 at 11:56
Need to see the code where you adding image to the control. – jdweng Mar 29 '21 at 12:40
@jdweng `Graphics.FromHwnd(IntPtr.Zero)` means getting the Windows Desktop Graphics. – huang May 23 '21 at 16:36
@JokeHuang : Where does it say the you can pass a zero pointer to the method? – jdweng May 23 '21 at 17:42
@jdweng https://stackoverflow.com/a/37075887/3907561 – huang May 23 '21 at 17:52

Graphics's dpi not refreshing at runtime in c#

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