owned_types.cs

using System.Linq;
using Microsoft.EntityFrameworkCore;
using Microsoft.VisualStudio.TestTools.UnitTesting;

namespace PropertyManagementSync.Tests
{
  [TestClass]
  public class OwnedTypeTests
  {
    [Owned]
    public class EmailObject
    {
      public string Value { get; protected set; }

      public EmailObject(string value)
      {
        Value = value;
      }
    }
    
    class Entity
    {
      public int Id { get; set; }
      public EmailObject Email { get; set; }
    }
    
    class TestContext : DbContext 
    {
      public DbSet<Entity> Entities { get; set; }
      
      protected override void OnModelCreating(ModelBuilder modelBuilder)
      {
        base.OnModelCreating(modelBuilder);

        modelBuilder.Entity<Entity>()
                    .OwnsOne(e => e.Email,
                             email => email.Property(m => m.Value).HasColumnName("Email"));
      }
    }
    
    [TestMethod]
    public void Test()
    {
      using var context = new TestContext();
      context.Database.EnsureDeleted();
      context.Database.EnsureCreated();
      var e = new Entity
      {
        Email = new EmailObject("[email protected]")
      };

      context.Entities.Add(e);
      context.SaveChanges();
      
      
      using var ctx2 = new TestContext();

      Entity entity = context.Entities.First();
      Assert.AreEqual("[email protected]", entity.Email.Value);
    }
  }
}