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Thank you @j-loscos, works like a charm. I slightly adjusted your solution to include some new-lines (and removed the unnecessary restore at the end).

  <Target Name="DisableWarnings" BeforeTargets="CoreCompile">
    <ItemGroup>
      <AutoGeneratedFiles Include="**/*.Designer.cs" />
    </ItemGroup>
    <WriteLinesToFile File="%(AutoGeneratedFiles.FullPath)"
        Condition="!$([System.IO.File]::ReadAllText(%(AutoGeneratedFiles.FullPath)).StartsWith(&quot;#pragma warning&quot;))"
        Lines="$([System.String]::Concat(&quot;#pragma warning disable 1591&quot;,$([System.Environment]::NewLine),$([System.Environment]::NewLine),$([System.IO.File]::ReadAllText(%(AutoGeneratedFiles.FullPath)))))"
        Overwrite="true"
        Encoding="Unicode" />
  </Target>

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Posted by: Christoph

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