Dynamically compile multiple files into assembly using Rosyln

Question

I've recently seen using CSharpCodeProvider is deprecated in .NET Core 5. I was wondering if there was a smart way to combine multiple files into one dll from which I can load up using Rosyln instead. I'd hate to have to stick with .NET Framework 4.7 as this is a big part of a program I'm working on.

My code used to be pretty much just this

string Files[] = Directory.GetFiles("xxxxx/bin/Debug/net5.0/Scripts", ".cs");
Parameters = new CompilerParameters(new string[1] {"xxxxx/bin/Debug/net5.0/Program.dll"}, "xxxxx/bin/Debug/net5.0/Scripts/Output/Scripts.dll");
return new CSharpCodeProvider().CompileAssemblyFromFile(Parameters, Files).CompiledAssembly;

What would be the most efficient way to do this in Rosyln?

Reference: https://github.com/dotnet/runtime/issues/18768#issuecomment-265381303 (PlatformNotSupportedException)

user_21698 · Answer

Nick Polyak has written a complete article on Code Project: Using Roslyn for Compiling Code into Separate Net Modules and Assembling them into a Dynamic Library and with complete source code available on GitHub.

While this might not be exactly what you are looking for, it should help you getting started with Roslyn concepts, how to create a CSharpCompilation from a SyntaxTree and emit it to a Stream.

Dynamically compile multiple files into assembly using Rosyln

1 Answers