实体框架 - 重用复杂类型

Question

我在Code First Entity框架中有一个实体,目前看起来像这样:

public class Entity
{
    // snip ...

    public string OriginalDepartment { get; set; }
    public string OriginalQueue { get; set; }

    public string CurrentDepartment { get; set; }
    public string CurrentQueue { get; set; }
}

我想为这些类型创建复杂类型,如下所示:

public class Location
{
    public string Department { get; set; }
    public string Queue { get; set; }
}

我想在Current和Original中使用相同的类型:

public Location Original { get; set; }
public Location Current { get; set; }

这是可能的,或者我需要创建两个复杂类型CurrentLocation和OriginalLocation？

public class OriginalLocation
{
    public string Department { get; set; }
    public string Queue { get; set; }
}

public class CurrentLocation
{
     public string Department { get; set; }
     public string Queue { get; set; }
}

Answer 1

它支持开箱即用,您不需要创建两个复杂类型.

您还可以使用模型构建器明确配置复杂类型

modelBuilder.ComplexType<Location>();

要自定义列名称,应从父实体配置配置它们

public class Location
{
    public string Department { get; set; }
    public string Queue { get; set; }
}

public class MyEntity
{
    public int Id { get; set; }
    public Location Original { get; set; }
    public Location Current { get; set; }
}

public class MyDbContext : DbContext
{
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.ComplexType<Location>();

        modelBuilder.Entity<MyEntity>().Property(x => x.Current.Queue).HasColumnName("myCustomColumnName");
    }
}

这将映射MyEntity.Current.Queue到myCustomName列