[BUG] error : The expression "[System.Version]::Parse('')" cannot be evaluated. Version string portion was too short or too long.

[ruffin--]

Describe the bug
Installed via nuget into Framework 4.8.1 project. Appeared to say this version should be 4.8.1 compatible.

Issues on installation. On reboot, project no longer opens.

<package id="coverlet.collector" version="6.0.4" targetFramework="net481" developmentDependency="true" />

To Reproduce
Install via nuget into XUnit project running Framework 4.8.1.

Expected behavior
App still builds.

Actual behavior

In Solution output window on solution load:

C:\Projects\MyApp\MyApp.csproj : error  : The expression "[System.Version]::Parse('')" cannot be evaluated. Version string portion was too short or too long.  C:\Projects\MyApp\packages\coverlet.collector.6.0.4\build\netstandard2.0\coverlet.collector.targets

Configuration (please complete the following information):
Please provide more information on your .NET configuration:

• Which coverlet package and version was used?
  • 6.0.4
  • Also occurs with 3.2.0
• Which version of .NET is the code running on?
  • 4.8.1
• What OS and version, and what distro if applicable?
  • Microsoft Windows [Version 10.0.26120.6760]
• What is the architecture (x64, x86, ARM, ARM64)?
  • x64
• Do you know whether it is specific to that configuration?
  • I do not.

Additional context
Add any other context about the problem here.

❗ Please also read Known Issues ✅

[ruffin--]

Looks like it might be here?

  <PropertyGroup>
    <_CoverletSdkNETCoreSdkVersion>$(NETCoreSdkVersion)</_CoverletSdkNETCoreSdkVersion>
    <_CoverletSdkNETCoreSdkVersion Condition="$(_CoverletSdkNETCoreSdkVersion.Contains('-'))">$(_CoverletSdkNETCoreSdkVersion.Split('-')[0])</_CoverletSdkNETCoreSdkVersion>
    <_CoverletSdkMinVersionWithDependencyTarget>6.0.100</_CoverletSdkMinVersionWithDependencyTarget>
    <_CoverletSourceRootTargetName>CoverletGetPathMap</_CoverletSourceRootTargetName>
    <_CoverletSourceRootTargetName Condition="'$([System.Version]::Parse($(_CoverletSdkNETCoreSdkVersion)).CompareTo($([System.Version]::Parse($(_CoverletSdkMinVersionWithDependencyTarget)))))' &gt;= '0' ">InitializeSourceRootMappedPaths</_CoverletSourceRootTargetName>
  </PropertyGroup>

Looks like there can only be one of two outcomes: Condition is true or it's false. I'm not sure if it likes true or false directly, so assuming optimistic (true) is what we might want for now and doing this as a hack:

    <!-- _CoverletSourceRootTargetName Condition="'$([System.Version]::Parse($(_CoverletSdkNETCoreSdkVersion)).CompareTo($([System.Version]::Parse($(_CoverletSdkMinVersionWithDependencyTarget)))))' &gt;= '0' ">InitializeSourceRootMappedPaths</_CoverletSourceRootTargetName -->
    <_CoverletSourceRootTargetName Condition="''==''">InitializeSourceRootMappedPaths</_CoverletSourceRootTargetName>

That does seem to let it continue. (Not offering as a fix, I don't think, but to say I'm more confident that's where the issue is.) /shrug

[Bertk]

Coverlet is a cross platform code coverage framework for .NET, with support for line, branch and method coverage. It works with .NET Framework on Windows and .NET Core on all supported platforms.

Thank you for this information. coverlet supports .NET framework but it requires a .NET Core runtime for test execution.
Please provide more information.

• .NET Core SDK
• Visual Studio Version (Microsoft.NET.Test.Sdk, xunit version)