EF6 include with join not including.

Question

I\'m well aware this is an issue with a clear solution in more simple situations, but i have implemented something that i think doing it otherwise or changing it completely due

Answer 1

Include never works if you project to an (anonymous or named) type. Think of it, in which class should EF include the child collection?

The include will work if you do

var query = from mission in context.Missions.Include("AssignedAgents")
    join client in context.Clients on mission.ClientId equals client.Id
    select mission

Then EF will have Mission objects for which it can load AssignedAgents collections.

If you don't want to get the full objects you can get the same effect by incorporating AssignedAgents as a property in the anonymous type:

var query = from mission in context.Missions
    join client in context.Clients on mission.ClientId equals client.Id
    select new
        {
            mission,
            client.Name,
            client.Office,
            client.Id,
            Agents = mission.AssignedAgents
        };