Entity Framework returning distinct records after join

Question

Consider we have these two entities and one custom object :

    public class  Entiy1
{
    public int Id { get; set; }
    public int DestinationId { get; set;          


        

Answer 1

Using LINQ extensions, I'm more of a fan of them:

var results = entityList1
            .GroupBy(e => e.DestinationId)
            .Select(e => e.First())
            .Join(entityList2, e1 => e1.DestinationId, e2 => e2.DestinationId, (e1, e2) => 
                new EntityDTO
                {
                    DestinationId = e1.DestinationId,
                    DestinationName = e2.DestinationName,
                    JobTitle = e1.JobTitle,
                    Name = e1.Name
                });

Same thing as Gert's anwser really. You can use Distinct but, you would have to inherit from IEquatible and implement the Equals method and override the GetHashCode method to get it to work.