SubscribeAsync(IAsyncObservable<T>, Func<T, StreamSequenceToken, Task>, StreamSequenceToken)
staticextension
public static Task<StreamSubscriptionHandle<T>> SubscribeAsync<T>(this IAsyncObservable<T> obs, Func<T, StreamSequenceToken, Task> onNextAsync, StreamSequenceToken token) Subscribe a consumer to this observable using delegates. This method is a helper for the IAsyncObservable.SubscribeAsync allowing the subscribing class to inline the handler methods instead of requiring an instance of IAsyncObserver.
Parameters
obsIAsyncObservable<T>- The Observable object.
onNextAsyncFunc<T, StreamSequenceToken, Task>- Delegate that is called for IAsyncObserver.OnNextAsync.
tokenStreamSequenceToken- The stream sequence to be used as an offset to start the subscription from.
Returns
A promise for a StreamSubscriptionHandle that represents the subscription. The consumer may unsubscribe by using this handle. The subscription remains active for as long as it is not explicitly unsubscribed.
Exceptions
System.ArgumentException- Thrown if the supplied stream filter function is not suitable. Usually this is because it is not a static method.