/// <summary>
/// Converts a .NET event conforming to the standard .NET event pattern into an observable
/// sequence, subscribing weakly.
/// </summary>
/// <typeparam name="TTarget">The type of target.</typeparam>
/// <typeparam name="TEventArgs">The type of the event args.</typeparam>
/// <param name="target">Object instance that exposes the event to convert.</param>
/// <param name="eventName">Name of the event to convert.</param>
/// <returns></returns>
public static IObservable <EventPattern <object, TEventArgs> > FromEventPattern <TTarget, TEventArgs>(
TTarget target,
string eventName)
where TEventArgs : EventArgs
{
Contract.Requires <ArgumentNullException>(target != null);
Contract.Requires <ArgumentNullException>(eventName != null);
return(Observable.Create <EventPattern <object, TEventArgs> >(observer =>
{
var handler = new Handler <TEventArgs>(observer);
WeakSubscriptionManager.Subscribe(target, eventName, handler);
return () => WeakSubscriptionManager.Unsubscribe(target, eventName, handler);
}).Publish().RefCount());
}
/// <summary>
/// Converts a .NET event conforming to the standard .NET event pattern into an observable
/// sequence, subscribing weakly.
/// </summary>
/// <typeparam name="TTarget">The type of target.</typeparam>
/// <typeparam name="TEventArgs">The type of the event args.</typeparam>
/// <param name="target">Object instance that exposes the event to convert.</param>
/// <param name="eventName">Name of the event to convert.</param>
/// <returns></returns>
public static IObservable <EventPattern <object, TEventArgs> > FromEventPattern <TTarget, TEventArgs>(
TTarget target,
string eventName)
where TEventArgs : EventArgs
{
_ = target ?? throw new ArgumentNullException(nameof(target));
_ = eventName ?? throw new ArgumentNullException(nameof(eventName));
return(Observable.Create <EventPattern <object, TEventArgs> >(observer =>
{
var handler = new Handler <TEventArgs>(observer);
WeakSubscriptionManager.Subscribe(target, eventName, handler);
return () => WeakSubscriptionManager.Unsubscribe(target, eventName, handler);
}).Publish().RefCount());
}
