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LINQ: Need to do a Join on ManufacturerId

Posted on 2014-12-11
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Last Modified: 2016-02-16
I have DealerManufacturers and each Manufacturer has a Bool property. I need the Count of DealerManufacturer which have that property as true.

public class Manufacturer
{
  public virtual id { get; set; }
  public virtual IsServiceable { get { return id != 45; } }
}

public class DealerManufacturer
{
        public virtual int DealerId  { get; set; }
        public virtual int ManufacturerId  { get; set; }
 }

I have numerous an IList<DealerManufacturers> in the model and need a count of those which are IsServiceable is TRUE

model.DealerManufacturers

Thanks.
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Comment
Question by:newbieweb
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6 Comments
 
LVL 62

Expert Comment

by:Fernando Soto
ID: 40494423
Hi newbieweb;

Something like this should give you the count.

IList<DealerManufacturers> dmList = ....;
IList<Manufacturer> mList = ....;

var serviceable = (from dm in dmList
                   from m in mList
                   where dm.DealerId == m.id && m.IsServiceable == true
                   select dm).Count();

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Author Comment

by:newbieweb
ID: 40494431
Sorry, I forgot to say. I only use the Fluent LINQ API...
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LVL 62

Accepted Solution

by:
Fernando Soto earned 500 total points
ID: 40494491
var serviceableCount = dmList.Join(mList, 
                       dm => dm.DealerId, 
                       m => m.id,
                       (dm, m) => m.m.IsServiceable == true).Count();

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Author Comment

by:newbieweb
ID: 40494606
I ended up using a different syntax and two queries. Is this inferior to yours? I could not get yours to work:

            IList<Manufacturer> newSaleManufacturers = DefaultRepository.FindByQuery(new FindManufacturersQuery()).Where(x => x.IsServiceable && x.IsNewSale).ToList();

            bool sellsNew = newSaleManufacturers.Where(x => model.DealerManufacturers.Select(y => y.ManufacturerId).Contains(x.Id)).Count() > 0;
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LVL 62

Expert Comment

by:Fernando Soto
ID: 40496349
Can you post how you implemented the solution I posted please.
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Author Closing Comment

by:newbieweb
ID: 40507179
Sorry, no time. Your post helped.

Thanks.
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