/// <summary>
/// Unhooks an <see cref="AsynchronousEventHandler{T}"/> from this <see cref="AsynchronousEvent{T}"/>.
/// </summary>
/// <param name="handler"> The <see cref="AsynchronousEventHandler{T}"/> to unhook. </param>
public void Unhook(AsynchronousEventHandler <T> handler)
{
if (handler == null)
{
throw new ArgumentNullException(nameof(handler));
}
lock (_lock)
{
Delegate -= handler;
}
}
/// <summary>
/// Unhooks an <see cref="AsynchronousEventHandler{T}"/> from this <see cref="AsynchronousEvent{T}"/>.
/// </summary>
/// <param name="handler"> The <see cref="AsynchronousEventHandler{T}"/> to unhook. </param>
public void Unhook(AsynchronousEventHandler <TEventArgs> handler)
{
if (handler == null)
{
throw new ArgumentNullException(nameof(handler));
}
lock (this)
{
var currentHandlers = _handlers;
var newHandlers = currentHandlers.Remove(handler);
if (currentHandlers == newHandlers)
{
throw new ArgumentException($"The event handler {handler} was never hooked to this event.");
}
_handlers = newHandlers;
}
}
/// <summary>
/// Hooks an <see cref="AsynchronousEventHandler{T}"/> up to this <see cref="AsynchronousEvent{T}"/>.
/// </summary>
/// <param name="handler"> The <see cref="AsynchronousEventHandler{T}"/> to hook up. </param>
public void Hook(AsynchronousEventHandler <TEventArgs> handler)
{
if (handler == null)
{
throw new ArgumentNullException(nameof(handler));
}
lock (this)
{
var currentHandlers = _handlers;
var newHandlers = currentHandlers.Add(handler);
if (currentHandlers == newHandlers)
{
throw new ArgumentException($"The event handler {handler} is already hooked to this event. Did you hook it up twice by mistake?");
}
_handlers = newHandlers;
}
}
