Question

can anyone help?, i am stuck with a linq query..

basically i have a standard linq query that returns fields, 1 field (insurances) is actually another linq query like so

   // original from this in etc not included to keep msg short>
    select new Models.Custom.House.Insurance()
               {
                   Id = v.IdHouse,
                   Insurances = from gt in GroupHouseTariffs
                                join  i in InsuranceGroup
                                    on new { gt.IdTariff, gt.IdGroup}
                                       equals
                                       new { i.IdTariff, i.IdGroup}
                                select new
                                       {
                                           InsuranceId = i.Id,
                                           Price = i.Price
                                       }

basically insurance is injected into the insurance property from Models.Custom.House, it works as i can see it in my debug … i have 4 records in the insurance .. insurance is defined like this in House which is basically an Iqueryable of another small class..

       public IQueryable<Insurance> Insurances { get; set;}

So i tried to write an extension method, like so

    public static IQueryable<House> WithInsuranceId(this IQueryable<House> qry, int insuranceId)
    {
        return from h in qry
               where h.Insurance .. // BUT here is the problem i don't see my properties, I see plenty of linq methods

    }

I should be able to see insuranceId and do this , no?

    return from h in qry
               where h.Insurance.InsuranceId == 1;

Here is the class (its very small)

    public class Insurance
    {
        public int? InsuranceId { get; set; }
        public float? price{ get; set; }
    }

Maybe there is some sort of special lambda i need to know about 🙂 ?

Any help really appreciated, thank you.

Answer 1

Are there typos in the sample you posted?

I noticed the following:

// No object name specified, Price has a capital P
select new
{
    InsuranceId = i.Id,
    Price = i.Price
}

// Price has a small p
public class Insurance
{
    public int? InsuranceId { get; set; }
    public float? price{ get; set; }
}

Now, your actual query looks wrong to me as well.

House.Insurance has a property called ID and a property called Insurances, which is a collection. Yet your query states:

 return from h in qry
           where h.Insurance.InsuranceId == 1;

Do you mean:

return from h in qry
           where h.Insurance.Id == 1 select h;

Or:

return from h in qry
           where h.Insurance.Insurances.Contains(i => i.InsuranceID ==1) select h;