check if object has method with signature of delegate

Question

How can I check if a object has a method with the same signature of a specific delegate

    public delegate T GetSomething<T>(int aParameter);
    public static void Method<T>(object o, GetSomething<T> gs)
    {
        //check if 'o' has a method with the signature of 'gs'
    }

Answer 1

// You may want to tweak the GetMethods for private, static, etc...
foreach (var method in o.GetType().GetMethods(BindingFlags.Public))
{
    var del = Delegate.CreateDelegate(gs.GetType(), method, false);
    if (del != null)
    {
        Console.WriteLine("o has a method that matches the delegate type");
    }
}

Answer 2

You can do that by locating all methods in the type having the same return type, and the same sequence of types in the parameters:

var matchingMethods = o.GetType().GetMethods().Where(mi => 
    mi.ReturnType == gs.Method.ReturnType
    && mi.GetParameters().Select(pi => pi.ParameterType)
       .SequenceEqual(gs.Method.GetParameters().Select(pi => pi.ParameterType)));