Entity Framework: how to do correct “Include” on custom type

Question

Suppose we have 2 types, mapped to a Database via EF 4.

Schedule 1.....1 Visit

Also, we have third custom view type

public          


        

Answer 1

The error is spot on. Your trying to create an ObjectQuery (LINQ-Entities IQueryable), with a type (ScheduleView) which does not exist in your Model.

You can project into this type, sure - but not affect the query with it.

Will something like this work? (off the top of my head, untested)

var scheduleViews = (from s in ctx.Schedules
                     join v in ctx.Visits.Include("Patient") 
                     on v.ScheduleId equals s.ScheduleId
                     select new ScheduleView 
                     { 
                        Schedule = s, 
                        Visit = v 
                     }).ToList();

Your main problem is ObjectQuery is not translatable to a store expression. So do your include on the Visits entity set, not the IQueryable.

HTH