How to get Windows 10 display scaling value using C# (Note: not the DPI value)

Question

In the display settings of Windows 10, you can set the scaling ratio (for example: 125%, 150%). Please note that it is not the DPI value. How to get this value using C#.

Answer 1

For example with GetDpiForWindow

with a Manifest to get right results:

   <application xmlns="urn:schemas-microsoft-com:asm.v3">  
     <windowsSettings>  
       <dpiAware xmlns="http://schemas.microsoft.com/SMI/2005/WindowsSettings">true/PM</dpiAware>  
       <dpiAwareness xmlns="http://schemas.microsoft.com/SMI/2016/WindowsSettings">PerMonitor</dpiAwareness>  
      </windowsSettings>  
   </application>  

I get :
96 for 100%
120 for 125%
144 for 150%
etc...