public IDisposable Subscribe(IObserver <T> observer)
{
if (observer == null)
{
throw new ArgumentNullException(nameof(observer));
}
if (_error != null)
{
observer.OnError(_error);
return(Disposable.Nop);
}
if (_completed)
{
observer.OnCompleted();
return(Disposable.Nop);
}
Observers.Add(observer);
return(Delegate.Disposable(() =>
{
var observers = Observers;
// Could do the following to find the index of the
// the observer:
//
// var i = observers.FindIndex(o => o == observer);
//
// but it would require a closure allocation.
for (var i = 0; i < observers.Count; i++)
{
if (observers[i] == observer)
{
if (_shouldDeleteObserver)
{
observers[i] = null;
}
else
{
observers.RemoveAt(i);
}
break;
}
}
}));
}
public IDisposable Subscribe(IObserver <T> observer)
{
if (observer == null)
{
throw new ArgumentNullException(nameof(observer));
}
if (_error != null)
{
observer.OnError(_error);
return(Disposable.Nop);
}
if (_completed)
{
observer.OnCompleted();
return(Disposable.Nop);
}
Observers.Add(observer);
return(Delegate.Disposable(() => Observers.Remove(observer)));
}
/// <summary>
/// Subscribes an element handler and a completion handler to an
/// observable sequence.
/// </summary>
/// <typeparam name="T">Type of elements in <paramref name="source"/>.</typeparam>
/// <param name="source">Observable sequence to subscribe to.</param>
/// <param name="onNext">
/// Action to invoke for each element in <paramref name="source"/>.</param>
/// <param name="onError">
/// Action to invoke upon exceptional termination of the
/// <paramref name="source"/>.</param>
/// <param name="onCompleted">
/// Action to invoke upon graceful termination of <paramref name="source"/>.</param>
/// <returns>The subscription, which when disposed, will unsubscribe
/// from <paramref name="source"/>.</returns>
public static IDisposable Subscribe <T>(this IObservable <T> source, Action <T> onNext, Action <Exception>?onError = null, Action?onCompleted = null) =>
source == null
? throw new ArgumentNullException(nameof(source))
: source.Subscribe(Delegate.Observer(onNext, onError, onCompleted));
