/// <summary>
/// Deregisters an existing handler from this event.
/// </summary>
/// <param name="registrator"></param>
/// <param name="handler"></param>
/// <returns></returns>
public bool Deregister(object registrator, EventHandler <ArgumentsType> handler)
{
// Create the registration object to locate..
var registration = new EventHandlerRegistration <ArgumentsType>
{
Handler = handler,
Registrator = registrator
};
lock (this._registrationsLock)
{
// Attempt to locate the registration..
var registrationIndex = this._registrations.IndexOf(registration);
if (registrationIndex == -1)
{
return(false);
}
// Create clone of current registrations to manipulate..
var registrations = new List <EventHandlerRegistration <ArgumentsType> >(this._registrations.Count);
registrations.AddRange(this._registrations.Where((t, x) => x != registrationIndex));
// Update the registrations..
Interlocked.Exchange(ref this._registrations, registrations);
}
return(true);
}
/// <summary>
/// Registers a new handler to this event.
/// </summary>
/// <param name="registrator"></param>
/// <param name="handler"></param>
/// <param name="priority"></param>
public void Register(object registrator, EventHandler <ArgumentsType> handler, int priority)
{
// Ensure the priority is valid..
if (registrator != null && priority == 0)
{
throw new InvalidOperationException("Cannot register a new event with a priority of 0.");
}
// Create the new registration object..
var registration = new EventHandlerRegistration <ArgumentsType>
{
Handler = handler,
Priority = priority,
Registrator = registrator
};
lock (this._registrationsLock)
{
// Create clone of current registrations to manipulate..
var registrations = new List <EventHandlerRegistration <ArgumentsType> >(this._registrations.Count);
registrations.AddRange(this._registrations);
// Locate the proper priority position..
var insertIndex = registrations.Count;
for (var x = 0; x < registrations.Count; x++)
{
if (registrations[x].Priority > priority)
{
insertIndex = x;
break;
}
}
// Insert the new registration at the found index..
registrations.Insert(insertIndex, registration);
Interlocked.Exchange(ref this._registrations, registrations);
}
}
