/// <summary>
/// Raises the specified event.
/// </summary>
/// <param name="addAction">The action pointing to the add accessor.</param>
/// <param name="removeAction">The action pointing to the remove accessor.</param>
/// <param name="eventArgs">The <see cref="EventArgs"/> instance containing the event data.</param>
/// <returns>The value returned from the event subscriber(s), if any.</returns>
public object Raise(Action addAction, Action removeAction, EventArgs eventArgs)
{
EventAccessorPair accessorPair = _eventAccessorExtractor.FindEventAccessor(addAction, removeAction);
object sender = accessorPair.TargetInstance;
return(Raise(accessorPair, new[] { sender, eventArgs }));
}
private object Raise(EventAccessorPair accessorPair, object[] arguments)
{
EventSurrogate surrogate;
if (!_events.TryGetValue(accessorPair, out surrogate))
{
throw new ArgumentException("Could not find event surrogate for add/remove accessor pair");
}
return(surrogate.Raise(arguments.ToArray()));
}
/// <summary>
/// Intercepts the specified void event method.
/// </summary>
/// <typeparam name="TEventHandler">The type of the event handler.</typeparam>
/// <param name="arguments">The arguments provided in the original method call.</param>
/// <param name="invokedMethod">The invoked method.</param>
/// <param name="addMethod">The add accessor method.</param>
/// <param name="removeMethod">The remove accessor method.</param>
/// <returns>
/// A result that specifies whether the method was intercepted.
/// </returns>
private InterceptorResult InterceptVoidEventMethod <TEventHandler>(object[] arguments, MethodBase invokedMethod,
MethodBase addMethod, MethodBase removeMethod) where TEventHandler : class
{
object targetInstance = invokedMethod.IsStatic ? null : arguments[0];
var key = new EventAccessorPair(targetInstance, addMethod, removeMethod);
EventSurrogate surrogate = _events.GetOrAdd(key, _ => new EventSurrogate <TEventHandler>());
Delegate subscriber = (Delegate)(invokedMethod.IsStatic ? arguments[0] : arguments[1]);
if (invokedMethod == addMethod)
{
surrogate.Subscribe(subscriber);
}
else
{
surrogate.Unsubscribe(subscriber);
}
// Invoke the original event accessors too.
return(new InterceptorResult(false));
}
/// <summary>
/// Raises the specified event.
/// </summary>
/// <param name="addAction">The action pointing to the add accessor.</param>
/// <param name="removeAction">The action pointing to the remove accessor.</param>
/// <param name="arguments">The arguments.</param>
/// <returns>
/// The value returned from the event subscriber(s), if any.
/// </returns>
public object Raise(Action addAction, Action removeAction, object[] arguments)
{
EventAccessorPair accessorPair = _eventAccessorExtractor.FindEventAccessor(addAction, removeAction);
return(Raise(accessorPair, arguments));
}
