public static Page <T> GetPage <T>(this Microsoft.EntityFrameworkCore.DbSet <T> List, int page_index, int page_size, Func <T, object> order_by_selector)
where T : class
{
var res = List.OrderBy(order_by_selector)
.Skip(page_index * page_size)
.Take(page_size)
.ToArray();
if (res == null || res.Length == 0)
{
return(null);
}
var tot_items = List.Count();
var tot_pages = tot_items / page_size;
if (tot_items < page_size)
{
tot_pages = 1;
}
return(new Page <T>()
{
Index = page_index, Items = res, TotalPages = tot_pages
});
}