PagedList and Async

Question

I\'m using PagedList in my Views, but my scaffolded Controller is generated with this kind of default Index Action:

public async Task Index()         


        

Answer 1

Is there a reasonable way to work with PagedList and async?

Yes. Doesn't come out of the box with EF. But, you can get PagedList.EntityFramework which exposes a ToPagedListAsync:

public class PagedListExtended : BasePagedList 
{
    private PagedListExtended() 
    {
    }

    public static async Task> Create(IQueryable superset, int pageNumber, int pageSize) 
    {
        var list = new PagedListExtended();
        await list.Init(superset, pageNumber, pageSize);
        return list;
    }

    async Task Init(IQueryable superset, int pageNumber, int pageSize)
    {
        if (pageNumber < 1)
              throw new ArgumentOutOfRangeException("pageNumber", pageNumber, "PageNumber cannot be below 1.");
        if (pageSize < 1)
             throw new ArgumentOutOfRangeException("pageSize", pageSize, "PageSize cannot be less than 1.");
        TotalItemCount = superset == null ? 0 : await superset.CountAsync();
        PageSize = pageSize;
        PageNumber = pageNumber;
        PageCount = TotalItemCount > 0 ? (int) Math.Ceiling(TotalItemCount/(double) PageSize) : 0;
        HasPreviousPage = PageNumber > 1;
        HasNextPage = PageNumber < PageCount;
        IsFirstPage = PageNumber == 1;
        IsLastPage = PageNumber >= PageCount;
        FirstItemOnPage = (PageNumber - 1)*PageSize + 1;
        var num = FirstItemOnPage + PageSize - 1;
        LastItemOnPage = num > TotalItemCount ? TotalItemCount : num;
        if (superset == null || TotalItemCount <= 0)
            return;
        Subset.AddRange(pageNumber == 1 ? await superset.Skip(0).Take(pageSize).ToListAsync() : await superset.Skip((pageNumber - 1)*pageSize).Take(pageSize).ToListAsync());
    }
}

public static class PagedListExtendedExtensions 
{
     public static async Task> ToPagedListAsync(this IQueryable superset, int pageNumber, int pageSize)
     {
         return await PagedListExtended.Create(superset, pageNumber, pageSize);
      }
}