Ambiguity between method overloads with string and EventHandler parameters

I'm having some difficulty with an overloaded method. My signatures look like this:

void Register开发者_StackOverflow(object source, EventHandler mapped_handler)
void Register(object source, string mapped_property)

I'm trying to call the first one like this:

Register(someObject, (s, e) => { ... });

Visual Studio 2008 is giving me error CS1503: Argument '2': cannot convert from 'System.EventHandler' to 'string'.

What am I missing? I'm not really sure where the problem is. I have other non-overloaded methods which I can pass EventHandler lambdas to without a problem.

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That should be absolutely fine. Short but complete example:

using System;

public class Test
{
    static void Main(string[] args)
    {
        object o = new object();
        Register(o, (s, e) => {});
    }

    static void Register(object source, EventHandler handler)
    {
        Console.WriteLine("Handler");
    }

    static void Register(object source, string text)
    {
        Console.WriteLine("Text");
    }
}

If you could update your question with a similarly short but complete example which doesn't work, we may be able to help further. (My guess is that actually in the process of coming up with a short but complete example, you'll find the problem.)

The fact that your error message explicitly talks about EventHandler is somewhat suspicious - because the type of your argument isn't EventHandler, it's just a lambda expression which can be converted to EventHandler. Are you sure the error is on the calling line?

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You need to do:

Register(someObject, new EventHandler((s,e)=>{...}));

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Thanks for all the responses... turns out it was a problem in my method declarations. I had the type of the first parameter in my method signature specified wrong. I'll leave this question up for others who make silly mistakes like me.