Adding and Removing Anonymous Event Handler

Question

I was wondering if this actually worked ?

private void RegisterKeyChanged(T item) 
{
    item.OnKeyChanged += (o, k) => ChangeItemKey((T)o, k);
}

private         


        

Answer 1

For anyone interested, you can add and remove an anonymous event handler like this

public class Musician
{
    public void TuneGuitar()
    {
        Metronome metronome = new Metronome();

        EventHandler handler = null;
        handler = (sender, args) =>
        {
            // Tune guitar
            // ...

            // Unsubscribe from tick event when guitar sound is perfect
            metronome.Tick -= handler;
        };

        // Attach event handler
        metronome.Tick += handler;
    }
}

public class Metronome
{
    event EventHandler Tick;
}

UPDATE: In C# 7.0 we have supports for local functions so the TuneGuitar method can now be written as:

public void TuneGuitar()
{
    Metronome metronome = new Metronome();

    void handler(object sender, EventArgs args)
    {
        // Tune guitar
        // ...

        // Unsubscribe from tick event when guitar sound is perfect
        metronome.Tick -= handler;
    };

    // Attach event handler
    metronome.Tick += handler;
}