Detect when register to the property change event

Question

I have a Property Change event and I want to know when register to it.

Here my event in class1:

 public event PropertyChangedEventHandler PropertyChanged;

Here my register in class2 (MyObj is an instance of a Class1):

 MyObj.PropertyChanged += MyObj_PropertyChanged;

When the registration is happening, I want to run a specific function (from class1), how can I do it?

I could not find any way to do so...

Answer 1

Use this syntax to declare event:

class MyClass
{
    private EventHandler myEvent;

    private void OnEventHandlerRegistered()
    {
        Console.WriteLine("Event handler registered.");
    }

    public event EventHandler MyEvent
    {
        add 
        {
            myEvent += value;
            OnEventHandlerRegistered();
        }
        remove
        {
            myEvent -= value;
        }
    }
}