private static async Task <PaginatedItem <TResponse> > GetDataAsync <TDbContext, TEntity, TResponse>(
IEfQueryRepository <TDbContext, TEntity> repo,
Criterion criterion,
Expression <Func <TEntity, TResponse> > selector,
Expression <Func <TEntity, bool> > filter = null,
params Expression <Func <TEntity, object> >[] includeProperties)
where TDbContext : DbContext
where TEntity : class, IEntity
{
if (criterion.PageSize < 1 || criterion.PageSize > criterion.DefaultPagingOption.PageSize)
{
criterion.SetPageSize(criterion.DefaultPagingOption.PageSize);
}
var queryable = repo.Queryable();
if (includeProperties != null && includeProperties.Count() > 0)
{
queryable = includeProperties.Aggregate(
queryable,
(current, include) => current.Include(include));
}
if (filter != null)
{
queryable = queryable.Where(filter);
}
if (!string.IsNullOrWhiteSpace(criterion.SortBy))
{
var isDesc = string.Equals(criterion.SortOrder, "desc", StringComparison.OrdinalIgnoreCase) ? true : false;
queryable = queryable.OrderByPropertyName(criterion.SortBy, isDesc);
}
var results = await queryable
.Skip(criterion.CurrentPage *criterion.PageSize)
.Take(criterion.PageSize)
.AsNoTracking()
.Select(selector)
.ToListAsync();
var totalRecord = await queryable.CountAsync();
var totalPages = (int)Math.Ceiling((double)totalRecord / criterion.PageSize);
if (criterion.CurrentPage > totalPages)
{
criterion.SetCurrentPage(totalPages);
}
return(new PaginatedItem <TResponse>(totalRecord, totalPages, results));
}