Please add support to load other files

[charring]

Is your feature request related to a problem? Please describe.

DRY code requires code reuse. I make extensive use of this in C# scripting.

Describe the solution you'd like

I've been using dotnet-script for several years for both unit testing code and for creating small utilities. Being able to load scripts (with "#load - see below) from other scripts is a core feature for keeping my code DRY. It would be a knock against "dotnet run" if a comparable syntax was not available.

I propose "#:load file.cs"

Additional context

It's just a preprocessor - not a change to the C# syntax. Just like the others being added.

https://github.com/dotnet-script/dotnet-script#consuming-a-script-package

[DamianEdwards]

We're only supporting single-file for .NET 10 but plan to tackle multi-file as soon as .NET 10 is done.

That's being tracked in #48174