/// <summary>
/// Removes the range of <paramref name="keys"/> from the <paramref name="cache" />.
/// </summary>
/// <param name="cache">The cache to use.</param>
/// <param name="keys">The keys to remove.</param>
/// <param name="scheduler">Scheduler to perform the remove action on.</param>
/// <returns>
/// An observable stream that returns an observable stream of either [true] or [false] for every key provided by the <paramref name="keys"/> variable
/// and whether it was successfully found and removed.. or not.
/// </returns>
/// <remarks>
/// The returned observable stream of [true] or [false] has the same order as the <paramref name="keys"/> provided.
/// </remarks>
public static IObservable <bool> RemoveRange <TKey, TValue>(this IObservableCache <TKey, TValue> cache, IEnumerable <TKey> keys, IScheduler scheduler = null)
{
if (cache == null)
{
throw new ArgumentNullException(nameof(cache));
}
if (keys == null)
{
throw new ArgumentNullException(nameof(keys));
}
var keysAsList = keys.ToList();
if (keysAsList.Count == 0)
{
return(scheduler != null
? Observable.Empty <bool>(scheduler)
: Observable.Empty <bool>());
}
return(cache.RemoveRange(keysAsList.AsObservable(scheduler), scheduler));
}