What do you mean by "include them"? You don't need to include any C# files to compile. You just reference existing .dll modules in compiler arguments.
I meant I only need it for syntax highlighting. By having the declarations, my code editor (not an ide or compiler) can know which identifier is a type and whatnot. "include them" just meant having those files recognized by the editor.
I also don't need to see decompiled code or debugging/stepping into code, just the declaration of classes and functions, like what happens when you use "go to definition" in VS and it creates a temporary "header" file.
I was hoping for something like: if you use this command in VS or this program, it will automatically generate all the types and functions for you into a C# file. Because as I said, VS is already doing that, but the problems are it's temporary and I need to manually "go to definition" for each type.
Edit: Just checked out ILSpy, and it seems like the program is doing what I want. Is there a way to export all the definitions to a C# source file?