Question

I have two tables having 1 to 1 relationship. One table called Person and second is PersonDetails. PesonId is in PersonDetails table as FK.

I can query individual tables like

public static Person GetPersonById(int personId)
{
    using (var context = new REntities())
    {
    return context.Person.Where(p => p.PersonId == personId).First();
    }
}

It is being used in consuming code like:

Person personInfo = PersonService.GetPersonById(personId);

and same with PersonDetail on its PK i.e. PersonDetailId

But when I have to fetch data from two tables then I am not understanding that what how would I do this and what would be the best way to return data to presentation layer.

Following would be the code to get Person and relate PersonDetails records:

from personData in context.person.Include("PersonDetail")
                                  where personData.PersonId == personId
                                  select personData;

What is personData here?
How can I iterate over it and get each item in client code?

Thanks.

Answer 1

When you get your Person object, you can include the PersonDetails object as well within the query like this…

using (var context = new REntities())
{
  return context.Person.Include("PersonDetail").Where(p => p.PersonId == personId).First();
}

Now on the presentation side, when you get the Person object, iterate through each item of person detail like this…

from p in personInfo.PersonDetails
select p; // here p is the person detail object

Hope it helps.