EF Core 10.0: Support for Complex Types without using Owned Entities

EF Core 10.0 introduces a new approach for mapping complex types in a Entity. Prior to EF Core 10.0, we can manage complex types using Owned Entities.

With EF Core 10.0, we now have a new method ComplexProperty() and in this post let's have a look at the newer approach and possibly do a comparison.

Consider the following.

public class Customer
{
    public int Id { get; set; }
 
    public string Name { get; set; }
 
    public required Address ShippingAddress { get; set; }
 
    public required Address BillingAddress { get; set; }
}
 
public class Address
{
    public required string Street { get; set; }
 
    public required string City { get; set; }
 
    public required string State { get; set; }
 
    public required string PostalCode { get; set; }
}

Now let's see how we can map ShippingAddress and BillingAddress, using Owned Entities vs ComplexProperty.

public class MyDbContext : DbContext
{
    public DbSet<Customer> Customers { get; set; }
 
    protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        optionsBuilder
            .UseSqlServer("<ConnectionString>");
    }
 
    override protected void OnModelCreating(ModelBuilder modelBuilder)
    {
        modelBuilder
            .Entity<Customer>(x =>
            {
                // Using Owned Entity Types
                x.OwnsOne(x => x.ShippingAddress);
 
                // Using Complex Types (new in EF Core 10)
                x.ComplexProperty(x => x.BillingAddress);
            });
    }
}

Owned Entity vs ComplexProperty

You can basically do all the customizations as we used to do in Owned Entities. 

For an example, map the properties to different column names, I can do this.

override protected void OnModelCreating(ModelBuilder modelBuilder)
{
    modelBuilder
        .Entity<Customer>(x =>
        {
            // Using Owned Entity Types
            x.OwnsOne(x => x.ShippingAddress, y =>
            {
                // Map the properties to different column names
                y.Property(p => p.Street).HasColumnName("ShippingStreet");
            });
 
            // Using Complex Types(new in EF Core 10)
            x.ComplexProperty(x => x.BillingAddress, y =>
            {
                // Map the properties to different column names
                y.Property(p => p.Street).HasColumnName("BillingStreet");
            });
        });
}

From EF Core 10.0 onwards, ComplexProperty() would be more recommended approach for managing complex types.

Read more:
   EF Core 10.0: Complex Types

Hope this helps.

Happy Coding.

Regards,

Jaliya