Entity Framework linq join/association

Question

I'm trying to do a join/ association in entity framework using linq.

I have the following two tables:

Institution

id name country_code(same as iso3) etc...

Country

id name iso3

I have tried the following but i'm getting stuck at where to associate the objects with each other:

List<Institution> ins = _context.Institution
                                .Include(o => o.country)

thanks

It seems fine to me but try to log the generated SQL by using this _context.Database.Log = s => Debug.WriteLine(s). Also check the relation between your classes — alnaji, Jul 13 '16 at 09:27

score 2 · Answer 1 · edited May 23 '17 at 10:28

2

if iso3 and country_code is not bound with a foreign constraint you should use .Join for lambda expression. Check the link here

edited May 23 '17 at 10:28

Community

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answered Jul 13 '16 at 08:57

ilkerkaran

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score 1 · Answer 2 · answered Jul 13 '16 at 11:33

1

var ins = 
    _context.Institution
    .Join(_context.Country, 
          inst => inst.country_code,        
          ctry => ctry.iso3,   
         (inst, ctry) => new { Institution = inst, Country = ctry }).ToList();

answered Jul 13 '16 at 11:33

Ciro Corvino

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score 0 · Answer 3 · answered Jul 13 '16 at 10:15

0

Thanks for your help, I've added an extra column to the institution table called country_id, i'm sure there's probably a way I could have mapped the country_code of country to the institution entity, but I took the quick and easy way out.

Thanks again

answered Jul 13 '16 at 10:15

Karl O'Connor

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Entity Framework linq join/association

Institution

Country

3 Answers3