Using coverlet with. Net Framework generates an error: The expression "[System.Version]::Parse('')" canot be evaluated

Question

I wrote a very simple C# .Net Framework application and added some unit tests. Now, trying to check the coverage using coverlet. Getting error MSB4184.

The expression "[System.Version]::Parse('')" canot be evaluated. Version string portion was too short or too long. (parameter 'input' ).

Does anyone encounter such an error?

`[typename]::StaticMethod()` <-- is [tag:powershell] syntax, not C# - perhaps from your build script? — Mathias R. Jessen, Apr 12 '21 at 12:26
@MathiasR.Jessen that's also Msbuild syntax (hence the MSB error) , so it's the Msbuild script — pinkfloydx33, Apr 12 '21 at 12:42
It looks like you are passing an empty string in, so "Version string portion was too short" is completely accurate. — Ben Voigt, Apr 12 '21 at 14:47

score 5 · Answer 1 · answered Jan 26 '22 at 20:39

5

One way I got around this issue was by renaming (or deleting) the coverlet.collector directory in your $HOME\.nuget\packages directory. Close Visual Studio completely, then re-open your solution or project.

answered Jan 26 '22 at 20:39

Edward J. Stembler

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score 2 · Answer 2 · answered Jun 16 '21 at 07:06

Coverlet has some limitations. It only supports SDK-style projects and in some cases only .NET Core test projects. This is not an issue if you start a new test project in a solution because you can mix up project types.

But migration of an existing old test project to an SDK style .NET Core project could be necessary.

https://github.com/coverlet-coverage/coverlet#Quick-Start has more information about the requirements.

Using coverlet with. Net Framework generates an error: The expression "[System.Version]::Parse('')" canot be evaluated

2 Answers2