// @nuget: EntityFramework

// @nuget: Z.EntityFramework.Plus.EF6

​

using System;

using System.Collections.Generic;

using System.Linq;

using System.Data.Entity;

using Z.EntityFramework.Plus;

​

public class Program

{

    public static void Main()

    {

        // Seed

        using (var context = new EntityContext())

        {

            context.People.Add(new Person() { Name = "ZZZ", Diagnosis = new Diagnosis() { Name = "Projects" }});

            context.SaveChanges();

        }

        // Test

        using (var context = new EntityContext())

        {

            var list = context.People.IncludeOptimized(x => x.Diagnosis).ToList();

            FiddleHelper.WriteTable(list);

            FiddleHelper.WriteTable(list.Select(x => x.Diagnosis));

        }

    }

​

    public class EntityContext : DbContext

    {

        public EntityContext() : base(FiddleHelper.GetConnectionStringSqlServer())

        {

​

        }

        public DbSet<Person> People { get; set; }

        public DbSet<Diagnosis> Diagnosis { get; set; }

    }

    public class Person

    {

        public int PersonID { get; set; }

        public string Name { get; set; }

        public Diagnosis Diagnosis { get; set; }

    }

    public class Diagnosis

    {

        public int DiagnosisID { get; set; }

        public string Name { get; set; }

    }

}