/// <summary>
/// Create sequence of read operations to load data up to a specified offset.
/// </summary>
/// <typeparam name="TResultItem"></typeparam>
/// <param name="pagedBackingStoreCollection"></param>
/// <param name="offset"></param>
/// <returns></returns>
public static IDisposable CreateReadsUpTo <TResultItem>(this IPagedBackingStoreCollection <TResultItem> pagedBackingStoreCollection, int offset)
{
return(pagedBackingStoreCollection.CreateOffsetsUpTo(offset).
Select(o => pagedBackingStoreCollection.ChangeSetProvider.CreateReadRequest(o)).ToObservable().
SelectMany(pr => pagedBackingStoreCollection.ChangeSetProvider.ReadPageObservable(pr)).
Subscribe());
}