c# – EF多重关系

所以我有一个客户.客户可以有多个地址,但至少有一个.其中一个地址也将被设置为主要地址(必需).我尝试了各种映射,但到目前为止,我在构建或种子数据库时遇到错误.

顾客：

public class Customer
{
    public int CustomerId { get; set;}
    public String CustomerName { get; set; }
    public int PrimaryAddressId { get; set; }
    public virtual CustomerAddress PrimaryAddress { get; set; }
    public virtual ICollection<CustomerAddress> CustomerAddresses { get; set; }    
}

地址：

public class CustomerAddress : Address
{
    public int CustomerAddressId { get; set; }
    public int CustomerId { get; set; }
    public virtual Customer Customer { get; set; }
}

这部分映射工作正常.它位于CustomerAddress上.

this.HasRequired(c => c.Customer)
            .WithMany(d => d.CustomerAddresses)
            .HasForeignKey(c => c.CustomerId);

但是如何指定在Customer中设置PrimaryAddress的正确映射？或者这是错误的方法？

谢谢

编辑 – 使用Arnolds和LueTM的答案：

此代码现在正在运行.

顾客：

public class Customer
{
    public int CustomerId { get; set;}
    public String CustomerName { get; set; }
    // public int PrimaryAddressId { get; set; } created in mapping
    public virtual CustomerAddress PrimaryAddress { get; set; }
    public virtual ICollection<CustomerAddress> CustomerAddresses { get; set; }    
}

地址：

public class CustomerAddress : Address
{
    public int CustomerAddressId { get; set; }
    public int CustomerId { get; set; }
    public virtual Customer Customer { get; set; }
}

客户映射：

modelBuilder.Entity<Customer>
            .HasOptional(c => c.PrimaryAddress)
            .WithOptionalDependent().Map(m => m.MapKey("PrimaryAddressId"));

        modelBuilder.Entity<Customer>
            .HasMany(c => c.CustomerAddresses)
            .WithRequired(c => c.Customer)
            .HasForeignKey(c => c.CustomerId)
            .WillCascadeOnDelete(false);

我使用存储库来确保首先创建一个新地址,保存,然后再设置为主地址并再次保存.存储库确保主要是“必需的”.