Asp.net mvc 3 EF延迟加载&；fluent API在表中创建附加字段

这是我的代码-首先，

附件

类：

    public class Attachment{
    (...)
          public int UserId { get; set; }
          public virtual User Author { get; set; }

          public int? BasicMedicalDataId { get; set; }
          public virtual BasicMedicalData MedicalData { get; set; }
    }

    public class BasicMedicalData{
    (..)
          public virtual ICollection<Attachment> Attachments { get; set; }
    }

以下是

BasicMedicalData

class：

    public class Attachment{
    (...)
          public int UserId { get; set; }
          public virtual User Author { get; set; }

          public int? BasicMedicalDataId { get; set; }
          public virtual BasicMedicalData MedicalData { get; set; }
    }

    public class BasicMedicalData{
    (..)
          public virtual ICollection<Attachment> Attachments { get; set; }
    }

它造成了奇怪的迁移：

    public override void Up()
    {
        CreateTable(
            "dbo.Attachments",
            c => new
                {
                    AttachmentId = c.Int(nullable: false, identity: true),
                    name = c.String(),
                    UserId = c.Int(nullable: false),
                    AddDate = c.DateTime(nullable: false),
                    BasicMedicalDataId = c.Int(),
                    del = c.Boolean(nullable: false),
                    BasicMedicalData_BasicMedicalDataId = c.Int(),
                })
            .PrimaryKey(t => t.AttachmentId)
            .ForeignKey("dbo.Users", t => t.UserId, cascadeDelete: true)
            .ForeignKey("dbo.PC_BasicMedicalData", t => t.BasicMedicalData_BasicMedicalDataId)
            .ForeignKey("dbo.PC_BasicMedicalData", t => t.BasicMedicalDataId)
            .Index(t => t.UserId)
            .Index(t => t.BasicMedicalData_BasicMedicalDataId)
            .Index(t => t.BasicMedicalDataId);
    }

问题就在这里-它在数据库

basicmedialdata\u basicmedialdataid

中创建了额外的字段，并在使用字段

basicmedialdataid

的延迟加载中忽略

当我将手动ID放入

BasicMedicalData\u BasicMedicalData

时，使用附件的延迟加载效果很好。但是我不能在这里用代码输入任何值，因为它不是

Attachments

属性

---

如何解决？为什么它会用不同的名称创建两个相同的字段？为什么使用字段

BasicMedicalDataId

的延迟加载不起作用？

您使用了

WithMany（）

重载，将关系配置为可选：许多在关系的另一侧没有导航属性，但在关系的另一侧确实有导航属性

试试这个：

   modelBuilder.Entity<Attachment>()
      //Attachment has an optional relationship with MedicalData
      .HasOptional(u => u.MedicalData)
       //It is many:optional with a navigation property named Attachments  
      .WithMany(d => d.Attachments)
      //The dependent's foreign key is BasicMedicalDataId    
      .HasForeignKey(u => u.BasicMedicalDataId);

modelBuilder.Entity