public static IAsyncObservable <TSource> DistinctUntilChanged <TSource>(IAsyncObservable <TSource> source)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
return(Create <TSource>(observer => source.SubscribeSafeAsync(AsyncObserver.DistinctUntilChanged(observer))));
}
public static IAsyncObservable <TSource> DistinctUntilChanged <TSource, TKey>(IAsyncObservable <TSource> source, Func <TSource, Task <TKey> > keySelector)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (keySelector == null)
{
throw new ArgumentNullException(nameof(keySelector));
}
return(Create <TSource>(observer => source.SubscribeSafeAsync(AsyncObserver.DistinctUntilChanged(observer, keySelector))));
}