Question

I have a .dll file and in there, there’s a method called A. When I call that method I’d like to call a method of my own, method B. So my question is, is it possible to call method B immediately when method A is finished?

Offcourse I can call method A and after that call method B manually. But I was wondering is there a manner to do this automatically, maybe with an event? So when method A is finished the event gets fired somehow and method A is called.

Edit:
I don’t have control over the .dll. So I cannot change anything in method A.

Answer 1

If you don’t have control over the dll, write a wrapper class

public class WrapAnotherClass : AnotherClass
{
    public EventHandler DoSomethingFinished;

    public new void DoSomething()
    {
        base.DoSomething();

        var temp = DoSomethingFinished;
        if (temp != null)
        {
            temp(this, EventArgs.Empty);
        }
    }
}

public class AnotherClass
{
    public void DoSomething()
    {
        Console.WriteLine("Do something!");
    }
}