实体框架种子上的空外键

Question

我试图弄清楚这里发生了什么。当我为数据库设定种子时，它生成的外键始终为空。我的模型很简单：

public class PnlTarget
{
    [Key]
    [DatabaseGenerated(DatabaseGeneratedOption.Identity)]
    public int PnlTargetId { get; set; }


    public ReferenceAsset Underlyer { get; set; }
    public decimal Target { get; set; }

    public virtual PnlSettings PnlSettings { get; set; }


}

public class PnlSettings
{
    [Key, DatabaseGenerated(DatabaseGeneratedOption.None)]
    public int PnlSettingsId { get; set; }

    public ColloquialType Type { get; set; }

    public virtual PnlTarget SPTSX60 { get; set; }
    public virtual PnlTarget SPTXLVPR { get; set; }
    public virtual PnlTarget STBANKX { get; set; }
    public virtual PnlTarget SX5E { get; set; }
    public virtual PnlTarget RTY { get; set; }
    public virtual PnlTarget SPX { get; set; }

    [DataType(DataType.DateTime)]
    public DateTime LastEdited { get; set; }

    public string LastEditedBy { get; set; }

}

所以它是一个1到0到很多的关系。当我用这样的东西播种时：

 PnlSettings vanillaAccelerator = new PnlSettings
        {
            PnlSettingsId = 1,
            Type = ColloquialType.VanillaAccelerator,
            RTY = new PnlTarget {Underlyer = ReferenceAsset.RTY, Target = (decimal) 0.004},
            SPX = new PnlTarget {Underlyer = ReferenceAsset.SPX, Target = (decimal) 0.004},
            SPTSX60 = new PnlTarget { Underlyer = ReferenceAsset.SPTSX60, Target = (decimal)0.004},
            SPTXLVPR = new PnlTarget { Underlyer = ReferenceAsset.SPTXLVPR, Target = (decimal)0.004},
            STBANKX = new PnlTarget { Underlyer = ReferenceAsset.STBANKX, Target = (decimal)0.004},
            SX5E = new PnlTarget { Underlyer = ReferenceAsset.SX5E, Target = (decimal)0.004},
            LastEdited = DateTime.Now,
            LastEditedBy = "SEED"
        };

我的外键属性始终为null，如此处所示。我尝试使用[ForeignKey]注释手动实现外键属性，但不幸的是它仍然生成了这个空列。这是为了吗？

谢谢！