How to get various types used in a C# project with Roslyn

Question

I am analyzing about converting an existing C# library to java. To start with I need to know what are the types / built-in keywords used in the existing C# library. I mean, for example

public class CSharpClass
{
int i;
float j;
Console.Writeline(String.Concat("A","B"));
}

In this class the types/Keywords used are,

1. public
2. int
3. float
4. Console
5. String

My Questions are,

1. Is there any way to do this. I hope I can do this with Roslyn. But we can get “LocalDeclarationStatementSyntax” for variables. But how to parse “Console” and “Concat”. Is that “Sytax walker” that parses all the tokens in a class is the only option?
2. Also how to get all the classes from a project file with Roslyn?

Answer 1

You need to semantics as well -- syntax is just the text you see and that's exactly what you get, nothing more, nothing less. Get a Compilation for your project, then you can call GetSemanticModel where you give it a tree, and then from there you can call GetTypeInfo or GetSymbolInfo (as appropriate, search online for the difference between these two) to get type information.

As far as getting the Compilation , if you're writing a command line tool you probably want to use MSBuildWorkspace to load your project. If you're analyzing the projects open in Visual Studio, use VisualStudioWorkspace , etc.