/// <summary>
/// Method invoked when (instead of) a new handler is removed from the target event.
/// </summary>
/// <param name="args">Context information.</param>
public override void OnRemoveHandler(EventInterceptionArgs args)
{
// Remove the handler from our own list.
if (RemoveHandler(args.Handler))
{
args.RemoveHandler(null);
}
// Remove the handler from the client.
DelegateReferenceKeeper.RemoveReference(args.Handler);
}
/// <summary>
/// Method invoked when (instead of) a new handler is added to the target event.
/// </summary>
/// <param name="args">Context information.</param>
public override void OnAddHandler(EventInterceptionArgs args)
{
// Add the handler to our own list.
if (AddHandler(args.Handler))
{
args.AddHandler(null);
}
// Register the handler to the client to prevent garbage collection of the handler.
DelegateReferenceKeeper.AddReference(args.Handler);
}
/// <summary>
/// Method invoked when (instead of) a new handler is removed from the target event.
/// </summary>
/// <param name="args">Context information.</param>
public override void OnRemoveHandler(EventInterceptionArgs args)
{
// Remove the handler from our own list.
if (RemoveHandler(args.Handler))
{
// If this is the last handler, remove the fake handler to ourselves from the target event.
args.RemoveHandler(null);
}
// Remove the handler from the client.
DelegateReferenceKeeper.RemoveReference(args.Handler);
}
/// <summary>
/// Method invoked when (instead of) a new handler is added to the target event.
/// </summary>
/// <param name="args">Context information.</param>
public override void OnAddHandler(EventInterceptionArgs args)
{
// Add the handler to our own list.
if (AddHandler(args.Handler))
{
// If it is the first handler we are adding, add a fake handler to ourselves to the target event.
// Whichever handler will add here will be passed to OnInvokeHandler, so it is safe and convenient to pass null.
args.AddHandler(null);
}
// Register the handler to the client to prevent garbage collection of the handler.
DelegateReferenceKeeper.AddReference(args.Handler);
}
