Question

This compiles but the second method is flagged as “Function is recursive on all paths.” and calling it results in a StackOverflowException. Intellisense (w/ ReSharper) supplied Invoke as a property.

public class Class1
{
    public void MyMethod(string value)
    {
        Console.WriteLine(value);
    }

    public void MyMethod(Func<string> getValue)
    {
        MyMethod(getValue.Invoke);
    }
}

Changing it to this works as expected:

    public void MyMethod(Func<string> getValue)
    {
        MyMethod(getValue.Invoke());
    }

What’s going on here? Is this just Intellisense weirdness or is there actually an Invoke property?

Answer 1

It’s the Invoke method – but being converted via method group conversion… which is then recursing. See if this makes it any clearer – it’s the equivalent code:

public void MyMethod(Func<string> getValue)
{
    Func<string> func = getValue.Invoke;
    MyMethod(func); // Eek, recursive!
}

(I’ll assume for the moment that you’re familiar with method group conversion as one way of obtaining a delegate instance. Let me know if you’re not and I’ll go into more details.)