S3264 — Events should be invoked

Why is this an issue?

Events that are not invoked anywhere are dead code, and there’s no good reason to keep them in the source.

Noncompliant code example

class UninvokedEventSample
{
    private event Action<object, EventArgs> Happened; // Noncompliant

    public void RegisterEventHandler(Action<object, EventArgs> handler)
    {
        Happened += handler; // we register some event handlers
    }

    public void RaiseEvent()
    {
        if (Happened != null)
        {
            // Happened(this, null); // the event is never triggered, because this line is commented out.
        }
    }
}