c# - 更新实体框架5，一对一关系

Question

public class Card : EntityBase
{
    [Required]
    [MaxLength(16)]
    [RegularExpression("([0-9]+)", ErrorMessage = "Only number allowed")]
    public string Number { get; set; }

    public bool IsActive { get; set; }

    public Customer Customer { get; set; }
}

public class Customer : EntityBase
{
    public Customer()
    {
        Address = new Address();
    }

    [Required]
    [MaxLength(50)]
    public string Name { get; set; }

    public string PhoneNumber { get; set; }

    public Address Address { get; set; }

    [ForeignKey("Card")]
    public int Card_Id { get; set; }

    public Card Card { get; set; }
}

public class CustomerConfiguration : EntityTypeConfiguration<Customer>
{
    public CustomerConfiguration()
    {
        HasRequired(x => x.Card).WithMany().HasForeignKey(x => x.Card_Id);
    }
}

static void CreateCustomer()
    {
        using (var context = new BenzineFleetContext())
        {
            var card = var card = new Card
                           {
                               Number = "123456"
                           };
            context.Cards.Add(card);
            context.SaveChanges();
        }

        using (var context = new BenzineFleetContext())
        {
            var card = context.Cards.First(c => c.Number == "123456");

            var customer = new Customer { Name = "Rayz", Card = card };
            context.Customers.Add(customer);
            context.SaveChanges();
        }
    }

我想创建新客户并使用数据库中的卡，当我保存到数据库时，表 Customer 中的 Card_Id 存在，但表 Card 中的 Customer_Id 为空。如何更新表卡中的 Customer_Id？

对不起我的英语不好:(谢谢你的帮助:)

Answer 1

你有没有尝试过：

using (var context = new BenzineFleetContext())
{
    var card = context.Cards.First(c => c.Number == "123456");

    var customer = new Customer { Name = "Rayz", Card = card };
    card.Customer = customer;
    context.SaveChanges();
}