public PagedViewModel(PageCounter counter, IQueryable <T> allItems)
{
Counter = counter ?? throw new ArgumentNullException(nameof(counter));
ItemsInThePage = null == allItems
? Array.Empty <T>().AsQueryable()
: SlicePage(allItems, Counter);
}
public PagedViewModel <T> Paginate <T>(IQueryable <T> allItems, PageRequest request)
{
if (request == null)
{
throw new ArgumentNullException(nameof(request));
}
var counter = new PageCounter((uint)request.PageNumber
, (byte)request.PageSize
, (uint)(allItems?.Count() ?? 0));
var vm = new PagedViewModel <T>(counter, allItems);
return(vm);
}
IQueryable <T> SlicePage(IQueryable <T> allItems, PageCounter page) => allItems.Skip((int)(page.Size * (page.Number - 1))).Take(page.Size);