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

If you need to do the Left joins then you have to use into and DefaultIfEmpty() as shown below.

var result = from person in _dbContext.Person
             join detail in _dbContext.PersonDetails on person.Id equals detail.PersonId into Details
             from m in Details.DefaultIfEmpty()
               select new
                {
                    id = person.Id,
                    firstname = person.Firstname,
                    lastname = person.Lastname,
                    detailText = m.DetailText
                };

You can learn more about it : Left Outer Join in LINQ to Entities