Entityframework 6:如何将自定义类型映射到SQL表

public class MyEntity
{
    [Key]
    public int Id { get; set; }

    [Column("CustomTypeName")]
    public CustomType CustomProperty { get; set; }
}

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity<MyEntity>()
        .Property(e => e.CustomProperty)
        .HasColumnName("CustomTypeName");
}

public class CustomTypeConverter : ValueConverter<CustomType, string>
{
    public CustomTypeConverter()
        : base(v => v.ToString(), v => new CustomType(v))
    {
    }
}

protected override void OnModelCreating(DbModelBuilder modelBuilder)
{
    modelBuilder.Entity<MyEntity>()
        .Property(e => e.CustomProperty)
        .HasConversion(new CustomTypeConverter());
}

public class CustomType
{
    public string Value { get; set; }

    public CustomType(string value)
    {
        Value = value;
    }

    public override string ToString()
    {
        return Value;
    }
}

public class MyEntity
{
    [Key]
    public int Id { get; set; }

    public CustomType CustomProperty { get; set; }
}

public class MyDbContext : DbContext
{
    public DbSet<MyEntity> MyEntities { get; set; }

    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<MyEntity>()
            .Property(e => e.CustomProperty)
            .HasConversion(new CustomTypeConverter());
    }
}