C#: How can I use delegate to find a function on an object and call it

Question

I would like to have a function like this:

Event.Call<Interface>(objectWithThatInterface, (x) => x.MethodOnObject);

So the method will be called on this object. But I have no idea how to do this. Maybe something with delegates?

Answer 1

It seems to me that this is very simply achieved with this:

public static class Event
{
    public static void Call<T>(T instance, Action<T> method) where T : Interface
    {
        method(instance);
    }
}

I have purposely avoided putting in any error checking to keep the code simple, but it should probably throw null reference exceptions if either of the parameters are null .

Answer 2

You could try something like this:

Implement event class:

class Event
{
    public static void Call<TInstance>(TInstance instance, Action<TInstance> action)
        where TInstance : IInterface
    {
        // invoke your instance
        action(instance);
    }
}

Implement concrete class:

class ConcreteObject
    : IInterface
{
    public void MethodOnObject()
    {
         Console.WriteLine("Called MethodOnObject()");
    }
}

Implement interface:

interface IInterface
{
    void MethodOnObject();
}

Usage:

IInterface objectWithThatInterface = new ConcreteObject();

Event.Call<IInterface>(objectWithThatInterface, x => x.MethodOnObject());

Hope it helps