Question

i have this simple class:

public class JDEItemLotAvailability
    {
        public string Code { get; set; }
        public int ShortCode { get; set; }
        public string Description { get; set; }
        public string PrimaryUnitCode { get; set; }
        public string BranchPlant { get; set; }
        public string Location { get; set; }
        public string Lot { get; set; }
        public int AvailableQuantity { get; set; }
    }

This DAL method in my BLL returns a list of them:

var returnedLotList = _JDE8dal.GetLotAvailabilityAsList(_lot);

I want to do the following in the returned list and i want to do it in the most “elegant” LINQ way.

I want to check if among the list there is a record that matches specific criteria. I have thought of something like this:

  var query =
      returnedLotList.Where(l => l.AvailableQuantity != 0 && l.BranchPlant == _mcu && l.Location == _locn)
                               .OrderByDescending(l => l.AvailableQuantity);

BUT i want to say that if the above query does not return results i want to take the first of the rest of the list entries.

How can i do that?

Answer 1

You can just use DefaultIfEmpty

//your first query, unaltered
var query =
      returnedLotList.Where(l => l.AvailableQuantity != 0 && l.BranchPlant == _mcu && l.Location == _locn)
                               .OrderByDescending(l => l.AvailableQuantity);

var query2 = query.DefaultIfEmpty(returnedLotList.Take(1));