Retrieving the MethodInfo of of the correct overload of a generic method

Question

I have this type that contains two overloads of a generic method. I like to retrieve one of the overloads (with the Func parameter) using reflection. T

Answer 1

You need to specify a concrete type using MethodInfo.MakeGenericMethod.

However, I should point out, that getting the right type to invoke MakeGenericMethod on is not easy when you have an overloaded generic method.

Here is an example:

var method = typeof(Foo)
                 .GetMethods()
                 .Where(x => x.Name == "Bar")
                 .Where(x => x.IsGenericMethod)
                 .Where(x => x.GetGenericArguments().Length == 1)
                 .Where(x => x.GetParameters().Length == 1)
                 .Where(x => 
                     x.GetParameters()[0].ParameterType == 
                     typeof(Action<>).MakeGenericType(x.GetGenericArguments()[0])
                 )
                 .Single();

 method = method.MakeGenericMethod(new Type[] { typeof(int) });

 Foo foo = new Foo();
 method.Invoke(foo, new Func[] { () => return 42; });