public static async Task <IPagedResult <T> > PaginateAsync <T>(this IQueryable <T> queryable, IPagedQueryImpl <T> pagedQuery)
{
if (queryable == null)
{
throw new ArgumentNullException(nameof(queryable));
}
if (pagedQuery == null)
{
throw new ArgumentNullException(nameof(pagedQuery));
}
var pageNo = pagedQuery.CurrentPage;
if (pageNo < 1)
{
pageNo = 1;
}
var resultsPerPage = pagedQuery.ResultsPerPage;
if (resultsPerPage < 1)
{
resultsPerPage = 10;
}
queryable = pagedQuery.Apply(queryable);
if (await queryable.AnyAsync() == false)
{
return(new PagedResult <T>(new PagedResult(pageNo, resultsPerPage, 0, 0), null));
}
var resultCount = await queryable.CountAsync();
var paginationData = new PagedResult(pageNo, resultsPerPage, (int)Math.Ceiling(1d * resultCount / resultsPerPage), resultCount);
var items = await queryable.Skip(resultsPerPage *(pageNo - 1)).Take(resultsPerPage).ToListAsync();
return(new PagedResult <T>(paginationData, items));
}
internal static Task <IPagedResult <T> > PaginateClientsideAsync <T>(this ICollection <T> collection, IPagedQueryImpl <T> pagedQuery)
{
if (collection == null)
{
throw new ArgumentNullException(nameof(collection));
}
if (pagedQuery == null)
{
throw new ArgumentNullException(nameof(pagedQuery));
}
var pageNo = pagedQuery.CurrentPage;
if (pageNo < 1)
{
pageNo = 1;
}
var resultsPerPage = pagedQuery.ResultsPerPage;
if (resultsPerPage < 1)
{
resultsPerPage = 10;
}
var items = pagedQuery.Apply(collection.AsQueryable());
if (items.Any() == false)
{
return(Task.FromResult <IPagedResult <T> >(new PagedResult <T>(new PagedResult(pageNo, resultsPerPage, 0, 0), null)));
}
var resultCount = items.Count();
var paginationData = new PagedResult(pageNo, resultsPerPage, (int)Math.Ceiling(1d * resultCount / resultsPerPage), resultCount);
items = items.Skip(resultsPerPage * (pageNo - 1)).Take(resultsPerPage);
return(Task.FromResult <IPagedResult <T> >(new PagedResult <T>(paginationData, items)));
}