dotnet sln add command inconsistent behaviour in .NET SDK 9.0.2xx

[davidsekar]

Describe the bug

There is an inconsistency while adding csproj to a solution file. This behaviour started after dotnet CLI moved to .NET SDK 9.0.2xx

To Reproduce

• Create a console application named "My.Name.Dot"
  This creates a solution within "C:\Users\User.Name\source\repos\My.Name.Dot" and the project is placed within "C:\Users\User.Name\source\repos\My.Name.Dot\My.Name.Dot\My.Name.Dot.csproj"

• Just for testing remove My.Name.Dot.csproj from the solution
  dotnet sln "My.Name.Dot.sln" remove "C:\Users\User.Name\source\repos\My.Name.Dot\My.Name.Dot\My.Name.Dot.csproj"
  and re-add with following command
  dotnet sln "My.Name.Dot.sln" add "C:\Users\User.Name\source\repos\My.Name.Dot\My.Name.Dot\My.Name.Dot.csproj"
  The project gets added to solution as expected

• Now copy the csproj folder outside of this solution under "C:\Users\User.Name\source\repos\My.Name.Dot1\My.Name.Dot1.csproj"
  Now try to add this csproj to the solution as follows

dotnet sln "My.Name.Dot.sln" add "C:\Users\User.Name\source\repos\My.Name.Dot1\My.Name.Dot1.csproj"

This strangely throws an exception

Exceptions (if any)

Names cannot:

• contain any of the following characters: / ? : \ * " < > |
• contain control characters
• be system reserved names, including 'CON', 'AUX', 'PRN', 'COM1' or 'LPT2'
• be '.' or '..' (Parameter 'name')

Further technical details

dotnet --info
.NET SDK:
Version: 9.0.200
Commit: 90e8b20
Workload version: 9.0.200-manifests.c4f6226a
MSBuild version: 17.13.8+cbc39bea8

Runtime Environment:
OS Name: Windows
OS Version: 10.0.22631
OS Platform: Windows
RID: win-x64
Base Path: C:\Program Files\dotnet\sdk\9.0.200\

[baronfel]

Thanks for reporting this. We believe this is part of #46456, which will be released in the March update to the .NET SDK.

[davidsekar]

I have gone through your earlier PR which addresses the relative path.
#46456

This issue is for an absolute path. Can you please confirm if the absolute path outside of solution folder gets resolved properly?

[baronfel]

cc @edvilme for question about the fix^