Roslyn - Find out if called method calls method

Question

I'm trying to learn how to use Roslyn and I keep hitting roadblocks that take a lot of thought to figure out how to get around. At the moment, focusing on experimenting to understand what's possible.

void Method1(){}
void Method2()
{
    Method1();
}
void Method3()
{
    Method2();
}

If I want to check if Method2 calls Method1, It's easy because I just look at it's syntax tree. As I understand it, If I'm looking at Method3 though and I want to find Method2, I should use the semantic tree because Method2 may be in a different file/namespace/etc.

My question is if I have only the IMethodSymbol of Method2, is there any way to find out if Method2 calls Method1?

Thanks for any help

Answer 1

If I understand you correctly, you know how to get from MethodDeclarationSyntax for Method3 to IMethodSymbol for Method2 and from MethodDeclarationSyntax for Method2 to Method1, but you don't know how to get from IMethodSymbol for Method2 to MethodDeclarationSyntax to Method2.

To do that, you can use DeclaringSyntaxReferences:

var method2Syntax = symbol.DeclaringSyntaxReferences.Single().GetSyntax();