Support multiple files in `dotnet run`

[jaredpar]

Consider the following directory layout:

- app\
  - file.cs
  - util.cs

When executing dotnet run file.cs the code inside file.cs should be able to use types / members in util.cs. Specifically:

// file.cs
Console.WriteLine(Util.GetMessage());

// util.cs
static class Util
{
  public static string GetMessage() => "Hello World";
}

When executing dotnet run file.cs this should execute and produce the output "Hello World".

[rpc-scandinavia]

Love this new feature.
What about something like this:

#:include util.cs

And the file is simply inserted/included either at the #:include util.cs statement position, or appended to the end as if everything was written in file.cs.

This will enable full control over which files are included in the build, and not just all files in the directory. Perhaps wildcards could be supported just as in .csproj files.

[devlead]

Love this new feature.
What about something like this:

#:include util.cs

And the file is simply inserted/included either at the #:include util.cs statement position, or appended to the end as if everything was written in file.cs.

This will enable full control over which files are included in the build, and not just all files in the directory. Perhaps wildcards could be supported just as in .csproj files.

💯
IMHO something like #:include file.cs indeed would make more sense, essentially it could be a short hand for

 <Compile Include = "file.cs"/>

where compile could be default, but possible to be overidden as second "argument".

[DamianEdwards]

We're moving support for multi-file out to .NET 11 so we can focus on making the single-file experience great in .NET 10.