How to use Reflection to Invoke an Overloaded Method in .NET

Question

Is there a way to Invoke an overloaded method using reflection in .NET (2.0). I have an application that dynamically instantiates classes that have been derived from a common base class. For compatibility purposes, this base class contains 2 methods of the same name, one with parameters, and one without. I need to call the parameterless method via the Invoke method. Right now, all I get is an error telling me that I'm trying to call an ambiguous method.

Yes, I could just cast the object as an instance of my base class and call the method I need. Eventually that will happen, but right now, internal complications will not allow it.

Any help would be great! Thanks.

Answer 1

You have to specify which method you want:

class SomeType 
{
    void Foo(int size, string bar) { }
    void Foo() { }
}

SomeType obj = new SomeType();
// call with int and string arguments
obj.GetType()
    .GetMethod("Foo", new Type[] { typeof(int), typeof(string) })
    .Invoke(obj, new object[] { 42, "Hello" });
// call without arguments
obj.GetType()
    .GetMethod("Foo", new Type[0])
    .Invoke(obj, new object[0]);