public TImplementationDelegate MapForAttachment([CanBeNull] EventHandler <TAbstraction> handler, [NotNull] Func <EventHandler <TAbstraction>, TImplementationDelegate> convertDelegate)
{
if (handler == null)
{
return(null);
}
if (convertDelegate == null)
{
throw new ArgumentNullException(nameof(convertDelegate));
}
if (!_lookup.TryGetValue(handler, out var ctx))
{
ctx = new AbstractionEventHandlerContext <TImplementationDelegate>(convertDelegate(handler));
_lookup.Add(handler, ctx);
}
ctx.Count++;
return(ctx.Handler);
}
public EventHandler <TImplementation> MapForAttachment([CanBeNull] EventHandler <TAbstraction> handler, [NotNull] Func <TImplementation, TAbstraction> toInterface)
{
if (toInterface == null)
{
throw new ArgumentNullException(nameof(toInterface));
}
if (handler == null)
{
return(null);
}
if (!_lookup.TryGetValue(handler, out var ctx))
{
ctx = new AbstractionEventHandlerContext <EventHandler <TImplementation> >((sender, args) => handler(sender, toInterface(args)));
_lookup.Add(handler, ctx);
}
ctx.Count++;
return(ctx.Handler);
}