The remove contextual keyword (C# Reference)

The remove contextual keyword is used to define a custom event accessor that is invoked when client code unsubscribes from your event. If you supply a custom remove accessor, you must also supply an add accessor.

The following example shows an event with custom add and remove accessors. For the full example, see How to implement interface events.

class Events : IDrawingObject
{
    event EventHandler PreDrawEvent;

    event EventHandler IDrawingObject.OnDraw
    {
        add => PreDrawEvent += value;
        remove => PreDrawEvent -= value;
    }
}

You don't typically need to provide your own custom event accessors. The automatically generated accessors when you declare an event are sufficient for most scenarios. Beginning with C# 14, you can declare partial events. The implementing declaration of a partial event must declare the add and remove handlers.

See also

• Events