How to find code where a method is being invoked?

Question

Is it possbile to search for and locate code where ANY class's method is being invoked, irrespective of where the method lives? 

In the example below, I want to find the code where the foo.Do("Hello", 50); method is located.

class Foo 
{ 
     public Foo() {}
     public Do(string s, int n){ ... }
}
class Bar 
{ 
    public void SomeMethod(Foo foo)
    {
        foo.Do("Hello", 50);  
    }
}     

Answer 1

Hi,

Method calls are parsed into a SyntaxNode of type InvocationExpressionSyntax. You can create a Syntax Walker that traverse the tree and aggregate the nodes of that type. Such walker could look similar to the following:

class InvocationWalker : SyntaxWalker
    {
        public readonly List<InvocationExpressionSyntax> InvocationExpressions = new List<InvocationExpressionSyntax>();
        public override void VisitInvocationExpression(InvocationExpressionSyntax node)
        {
            InvocationExpressions.Add(node);
            base.VisitInvocationExpression(node);
        }
    }

Thanks,

Mohammed

Answer 2

Mohammed's answer is one approach.  However, if you are using the "Roslyn.Services.dll" (and add a "using Roslyn.Services;"), you will also find that the ISymbol type has an extension method named FindReferences that will do the searching for you and return the results.

Hope this helps.

---

-- Kevin Pilch-Bisson [e-mail]

Answer 3

Thanks, I get it now.