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W/ LINQ return 1 product per location

Posted on 2013-11-12
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Last Modified: 2016-03-15
I have a map with products at locations.

Right now, I'm returning many products for each location.

However, I want to return a single product for each location.

This is my LINQ code.



		if (!String.IsNullOrEmpty(lystId))
		{
			//Only products in a lyst
			lystDistinct = (from l in dc.Lysts
								join mp in dc.MemberProductLysts on l.LystId equals mp.LystId
								join p in dc.Products on mp.ProductId equals p.ProductId
								join t in dc.Tags on p.TagId equals t.TagId
								join a in dc.Addresses on t.AddressId equals a.AddressId
								where l.LystId == new Guid(lystId)
								select a.AddressId).Distinct().ToList();
		}
		else
		{
			//All of the members products
			lystDistinct = (from l in dc.Lysts
								join mp in dc.MemberProductLysts on l.LystId equals mp.LystId
								join p in dc.Products on mp.ProductId equals p.ProductId
								join t in dc.Tags on p.TagId equals t.TagId
								join a in dc.Addresses on t.AddressId equals a.AddressId
								where l.MemberId == new Guid(System.Web.Security.Membership.GetUser().ProviderUserKey.ToString())
								select a.AddressId).Distinct().ToList();
		}

		var locationList = (from p in dc.Products
							join t in dc.Tags on p.TagId equals t.TagId
							join a in dc.Addresses on t.AddressId equals a.AddressId
							join pi in dc.ProductImages on p.ProductId equals pi.ProductId
							join i in dc.Images on pi.ImageId equals i.ImageId
							where lystDistinct.Contains(a.AddressId)
							where p.IsActive == true
							where t.IsActive == true
							// where t.IsPaying == true
							where t.RegionId == member.RegionId
							orderby dc.Random()
							select new { a.Latitude, a.Longitude, brandName = t.Name, productName = p.Name, i.FileName }).Distinct();

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Question by:Rob Gaudet
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4 Comments
 
LVL 96

Expert Comment

by:Bob Learned
ID: 39644565
It sounds like you need the First operator, but I can't see where to add that.  You would need to find the correct sequence to apply that to.
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Author Comment

by:Rob Gaudet
ID: 39648023
I was thinking the same thing, such as in a subquery of some kind.
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LVL 96

Accepted Solution

by:
Bob Learned earned 500 total points
ID: 39648084
Is location based on a record in Address?

       join a in dc.Addresses on t.AddressId equals a.AddressId

I would think that you might be able to use a group by expression, with a FirstOrDefault operator:

var sessions =  
    from m in this.members                     
    join s in 
    (
        from se in this.sessions
        group se by se.Name into g
        select new {Name = g.Key, SessionEndTime = g.FirstOrDefault()}
    )   
    on m.Name equals s.Name                    
    select new { MemberName = m.Name, SessionTime = s.SessionEndTime}

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Author Comment

by:Rob Gaudet
ID: 39648102
That makes sense. I will give it a try.
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