find out whether event handler is registered

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Event

public event EventHandler MyEvent;

Method

public bool IsRegistered(Delegate handler)
{
    return MyEvent != null && MyEvent.GetInvocationList().Contains(handler);
}

Using

var obj = new MyClass();

Console.WriteLine(obj.IsRegistered((EventHandler)MyEventHandler));

obj.MyEvent += MyEventHandler;

Console.WriteLine(obj.IsRegistered((EventHandler)MyEventHandler));

obj.MyEvent -= MyEventHandler;

Console.WriteLine(obj.IsRegistered((EventHandler)MyEventHandler));

Event handler

private static void MyEventHandler(object sender, EventArgs e)
{
            
}

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