Win11 Scaling Issues with .NET 4 WinForms Application

Question

A WinForms application developed in .NET 4 is experiencing display issues when running on Windows 11 with a zoom level of 125%. The application does not properly support DPI scaling due to limitations in .NET 4. Attempts to use the Windows API function SetProcessDPIAware have not resolved the problem. What solutions are available to address these scaling issues?

Answer 1

Hi @The Master , Welcome to Microsoft Q&A,

Since .NET 4 has very limited built-in support for DPI scaling, common techniques (such as calling SetProcessDPIAware) will not produce the expected results.

For earlier .NET you can use the manifest to add support for DPI, but the support is limited, it is recommended that you upgrade to 4.7+.

<application xmlns="urn:schemas-microsoft-com:asm.v3">
  <windowsSettings>
    <dpiAwareness>PerMonitorV2</dpiAwareness>
  </windowsSettings>
</application>

Best Regards,

Jiale

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