/// <summary>
/// Updates a range of <paramref name="keyValuePairs"/>.
/// </summary>
/// <param name="cache">The cache to use.</param>
/// <param name="keyValuePairs">The key/value pairs that each contain the key to update and the value to update it with.</param>
/// <param name="throwIfExpired">If set to <c>true</c>, a <see cref="KeyHasExpiredException{TKey}"/> will be thrown if the <paramref name="keyValuePairs"/> has at least one expired item key upon subscription.</param>
/// <param name="scheduler">Scheduler to perform the update action on.</param>
/// <returns>
/// An observable stream that returns the updated <paramref name="keyValuePairs"/>.
/// </returns>
public static IObservable <KeyValuePair <TKey, TValue> > UpdateRange <TKey, TValue>(this IObservableCache <TKey, TValue> cache, IDictionary <TKey, TValue> keyValuePairs, bool throwIfExpired = true, IScheduler scheduler = null)
{
if (cache == null)
{
throw new ArgumentNullException(nameof(cache));
}
if (keyValuePairs == null)
{
throw new ArgumentNullException(nameof(keyValuePairs));
}
return(cache.UpdateRange(Observable.Return(keyValuePairs), throwIfExpired, scheduler));
}