`dotnet run file.cs` / file-based app - environment variables available in directives

[hammypants]

TL;DR:

I want to be able to do something like this:

#:project $(REPO_PATH)/path/to/project/Foo.csproj

This better enables these "file-based apps" to fit more of a "script" workflow across machines or users.

I note that in the XML based project files, this can already be done.

Example:

<ProjectReference Include="$(HOME)/some/folder/in/home/Foo.csproj" />

And that in the dotnet run file document these directives map to their equivalent csproj equivalents.

An aside: it's... very difficult, let's say, to do any real research on this feature due to not having a consistent, unambiguous name for the feature. I made an attempt to look for duplicates of this kind of request, or other issues where it might have been mentioned, but an overwhelming majority of items that show up have nothing to do with file-based apps, because dotnet run is quite the loaded command now. I did the same to see if this was already available somehow, too.

[baronfel]

Probably a dupe of #49286, which is a PR in-progress at #51108.

[hammypants]

Probably a dupe of #49286, which is a PR in-progress at #51108.

I think so, yeah.

I'll close this, but I hope my feedback in the aside is taken to heart. :)