WinForms and High DPI Monitors

.NET 4.0 WinForms High DPI

• Add an app.manifest file
• Modify the app.config file
• Application/Manifest property: app.manifest

.NET 4.0 WinForms and High DPI Monitors

The High DPI support for WinForms is a mess. Microsoft requires these modifications to the project:

1. In the project's app.config file insert these lines before the </configuration> line:

   <appSettings>
     <add key="EnableWindowsFormsHighDpiAutoResizing" value="true"/>
   </appSettings>

2. Add a new app.manifest file to your application's project (Ctrl+Shift+A) and then uncomment these lines:

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

3. Double click on the Properties entry in the solution and and select the Application tab. Set the Manifest to "app.manifest".
4. Never run Visual Studio with a Screen resolution other than 100%. That will screw up the forms editor. (You probably aren't doing that, but I mention it for completeness.)

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