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[WIP] Remove mono support for .NET Framework applications #52091

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[WIP] Remove mono support for .NET Framework applications #52091

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4 changes: 0 additions & 4 deletions src/Tasks/Microsoft.NET.Build.Tasks/targets/Microsoft.NET.Sdk.targets
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Expand Up @@ -1441,10 +1441,6 @@ Copyright (c) .NET Foundation. All rights reserved.
<RunCommand Condition="'$(RunCommand)' == ''">$(TargetPath)</RunCommand>
<RunArguments Condition="'$(RunArguments)' == ''">$(StartArguments)</RunArguments>
</PropertyGroup>
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Copilot AI Dec 17, 2025

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After removing mono support, when users try to run .NET Framework applications on non-Windows platforms, the RunCommand property will be empty, which will cause a generic error message. Consider adding a PropertyGroup block that sets a more helpful error message or detection for this unsupported scenario. The current implementation will result in the error from RunCommand.ThrowUnableToRunError, but it would be more user-friendly to have a specific message explaining that .NET Framework applications can only be run on Windows and suggesting alternatives like upgrading to .NET or using Windows.

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</PropertyGroup>
</PropertyGroup>
<PropertyGroup Condition="'$([MSBuild]::IsOSPlatform(`Windows`))' != 'true' and '$(RunCommand)' == '' and '$(RunCommandErrorMessage)' == ''">
<RunCommandErrorMessage>.NET Framework applications can only be run on Windows. To run this application, use a Windows machine or upgrade to .NET.</RunCommandErrorMessage>
</PropertyGroup>

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<PropertyGroup Condition="$([MSBuild]::IsOSUnixLike())">
<RunCommand Condition="'$(RunCommand)' == ''">mono</RunCommand>
<RunArguments Condition="'$(RunArguments)' == ''">&quot;$(TargetPath)&quot; $(StartArguments)</RunArguments>
</PropertyGroup>
</When>
</Choose>

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