ASP.NET Core & EntityFramework Core: Left (Outer) Join in Linq

Question

I am trying to get a left join working in Linq using ASP.NET Core and EntityFramework Core.

Simple situation with two tables:

Person (id, firstname, lastnam

Answer 1

You not doing left join, the linq which you are using is basically creating a inner join. For left join in linq use into keyword

[HttpGet]
public IActionResult Get()
{
    var result = from person in _dbContext.Person
                    join detail in _dbContext.PersonDetails on person.Id equals detail.PersonId  
                    into Details
                    from defaultVal in Details.DefaultIfEmpty()
                    select new
                    {
                        id = person.Id,
                        firstname = person.Firstname,
                        lastname = person.Lastname,
                        detailText = defaultVal.DetailText
                    };
   return Ok(result);
}