Question

我有一个简单的模型，其中包含名为customer和address的类：

public class Customer : BusinessEntity
{
    public string FirstName { get; set; }

    public string LastName { get; set; }

    public DateTime? DateOfBirth { get; set; }

    public decimal? CreditLimit { get; set; }

    public virtual List<Address> Addresses { get; set; }

    public string Email { get; set; }
}

public class Address : BusinessEntity
{
    public string Street { get; set; }

    public string Floor { get; set; }

    public Customer Customer { get; set; }
}

我写了一个单元测试，用现有地址加载客户，修改该地址并调用更新。这是代码：

        Customer newCustomer = new Customer();

        newCustomer.FirstName = "Cosme";

        newCustomer.LastName = "Fulanito";

        newCustomer.Email = "anemail@mail.com";

        customerPersistence.Save(newCustomer);

        Customer existingCustomer = customerPersistence.FindByID(newCustomer.ID.Value);

        Assert.IsNotNull(existingCustomer, "Customer not found after saving");

        existingCustomer.LastName = "Fulanito Modified";

        existingCustomer.Addresses = new List<Address>();

        existingCustomer.Addresses.Add(new Address { Customer = existingCustomer, Floor = "21", Street = "Peron" });

        customerPersistence.Update(existingCustomer);

        Customer loadedCustomer = customerPersistence.FindByID(newCustomer.ID.Value);

        Assert.IsNotNull(loadedCustomer, "Customer not found after updating");

        Assert.IsTrue(loadedCustomer.LastName == existingCustomer.LastName, "Last name not updated");

        Assert.IsNotNull(loadedCustomer.Addresses, "Addresses collection is null");

        Assert.IsTrue(loadedCustomer.Addresses.Count > 0, "Addresses collection is empty");

        existingCustomer = customerPersistence.FindByID(newCustomer.ID.Value);

        Assert.IsNotNull(existingCustomer, "Customer not found after updating");

        existingCustomer.Addresses[0].Floor = "40";

        customerPersistence.Update(existingCustomer);

        Assert.IsTrue(loadedCustomer.Addresses[0].Floor == "40", "Address data not modified");

Context是对从DBContext继承的类的引用。我收到了这个错误：

来自'Address_Customer'AssociationSet的关系在 '删除'状态。给定多重约束，相应的 'Address_Customer_Source'也必须处于'已删除'状态。

我缺少什么？这是我在OnModelCreating方法中定义Customer和Address之间关系的方式的问题吗？我这样做：

modelBuilder.Entity<Address>()
            .HasRequired(p => p.Customer)
            .WithMany(p => p.Addresses)
            .Map(x => x.MapKey("CustomerID"))

谢谢Gonzalo

Answer 1

请将地址属性更改为ICollection。然后，在更新详细信息时，请检查EntityState是否已被deatched。如果它已分离，则必须将更新的对象（Customer和Address）附加到上下文中，并且必须告诉ObjectStateManager该对象已被修改。

实体框架POCO - 更新集合

1 个答案: