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how manage pagination ef core

By Vivacious VendaceVivacious Vendace on Aug 01, 2020 
public static class PaginationService
{

    public static async Task<Pagination<T>> GetPagination<T>(IQueryable<T> query, int page, string orderBy, bool orderByDesc, int pageSize) where T : class
    {
        Pagination<T> pagination = new Pagination<T>
        {
            TotalItems = query.Count(),
            PageSize = pageSize,
            CurrentPage = page,
            OrderBy = orderBy,
            OrderByDesc = orderByDesc
        };

        int skip = (page - 1) * pageSize;
        var props = typeof(T).GetProperties();
        var orderByProperty = props.FirstOrDefault(n => n.GetCustomAttribute<SortableAttribute>()?.OrderBy == orderBy);


         if (orderByProperty == null)
        {
            throw new Exception($"Field: '{orderBy}' is not sortable");
        }

        if (orderByDesc)
        {
            pagination.Result = await query
                .OrderByDescending(x => orderByProperty.GetValue(x))
                .Skip(skip)
                .Take(pageSize)
                .ToListAsync();

            return pagination;
        }
        pagination.Result = await query
            .OrderBy(x => orderByProperty.GetValue(x))
            .Skip(skip)
            .Take(pageSize)
            .ToListAsync();

        return pagination;
    }
}

Source: stackoverflow.com

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