Question

SubFoo is a subtype of Foo but only Bar displays the navigation property Bar. So

DB.Foos.Include('Bar')

generates

A specified Include path is not valid. The EntityType ‘Foo’ does not declare a navigation property with the name ‘Bar’.

What do I do? (besides obviously moving Bar to Foo)

Answer 1

One way is to project

var q = from f in DB.Foos
        let b = (f as SubFoo).Bar
        select new
        {
            Foo = f,
            Bar = b
        };
 return q.AsEnumerable().Select(q => q.Foo);