C# 实体框架HasForeignKey不工作

我在EF 6.2中遇到了HasForeignKey的一个奇怪行为

类别寄售有两个属性客户和发件人：

public class Consignment
{
    public Consignment()
    {
        Sender = new Sender();
        Customer = new Customer();
    }

    public string OrderNo { get; set; }

    public Customer Customer { get; set; }
    public Sender Sender { get; set; }

    public int CustomerId { get; set; }
}

CustomerId是客户的外键。实体配置如下：

    public class ConsignmentEntityConfiguration : EntityTypeConfiguration<Consignment>
{
    public ConsignmentEntityConfiguration()
    {
        HasKey(s => s.OrderNo);

        HasRequired(x => x.Customer)
            .WithMany()
            .HasForeignKey(x => x.CustomerId);

        HasRequired(x => x.Sender)
            .WithMany()
            .Map(x => x.MapKey("SenderId"));
    }
}

public class SenderEntityConfiguration : EntityTypeConfiguration<Sender>
{
    public SenderEntityConfiguration()
    {
        HasKey(x => x.Number);
    }
}

public class CustomerEntityConfiguration : EntityTypeConfiguration<Customer>
{
    public CustomerEntityConfiguration()
    {
        HasKey(x => x.Id);
    }
}

当我在新的测试项目（使用简单的类）中重新创建相同的模型时，HasForeignKey按预期工作

我在最初的项目中遗漏了什么？类非常简单，我检查了所有配置，原始项目和测试项目看起来一样，但工作方式不同

稍微简化的课程：

public class Sender
{
    public string Number { get; set; }
    public string Code { get; set; }
    public string Name { get; set; }
}
public class Customer
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
    public string Phone { get; set; }
    public string MobilePhone { get; set; }
}

---

您可以尝试添加客户

public virtual ICollection<Consignment> Consignments { get; set; }

---

试过了，没用。还有一个问题更多的是关于“什么会以这种方式影响外键的简单行为”，而不是如何修复它。它在具有类似上下文的其他项目中工作得非常好。

public class Sender
{
    public string Number { get; set; }
    public string Code { get; set; }
    public string Name { get; set; }
}
public class Customer
{
    public int Id { get; set; }
    public string Name { get; set; }
    public string Email { get; set; }
    public string Phone { get; set; }
    public string MobilePhone { get; set; }
}

public virtual ICollection<Consignment> Consignments { get; set; }

HasRequired(x => x.Customer)
            .WithMany(x=>x.Consignments)
            .HasForeignKey(x => x.CustomerId);