如何在ASP.NET MVC中使用实体框架在父表中创建外键并将其分配给子表

Question

I'm developing a website using asp.net mvc with entity framework. I have an existing database and the relationship is shown below.

Parent table:

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

    public int AddressId { get; set; }

    public virtual Addresses Address { get; set; }

    //Other properties...
}

Child table:

 public class Addresses
 {
    [Key, ForeignKey("Account")]
    public int AddressId { get; set; }

    public virtual Accounts Account { get; set; }

    //Other properties...
 }

//Create user logic:

public void CreateUser(UserModel model)
{
        Addresses newAddress = new Addresses()
        {
            ShippingFirstName = "1",
            ShippingLastName = "1",
            ShippingAddress = "1",
            ShippingAddress2 = "1",
            ShippingCity = "1",
            ShippingState = "1",
            ShippingZip = "1",
            ShippingCountry = "1",
            ShippingPhone = "1",
        };

        Accounts newAccount = new Accounts
        {
            UserFirstName = "a",
            UserLastName = "a",
            UserEmail = model.UserEmail,
            UserPassword = model.UserPassword,
            AddressId = 1,
            UserType = "User",
            Address = newAddress
        };
        context.Accounts.Add(newAccount);
        context.SaveChanges();
}

When I create the new user using the CreateUser function, the AddressId(primary key) in the Addresses table is the same as the AccountId(primary key, identity column) in the Accounts table after the data is inserted into the database, which means that entity framework uses the UserId as the foreign key and assigns it to the Addresses table. However, in my database, the foreign key is the AddressId in the Accounts table and points to the AddressId in the Addresses table.

Question:

1. Am I setting up the relationship in the entity class correctly?

2. How can I tell entity framework that it should use the AddressId in Accounts table as the foreign key, and assigns it to the AddressId in the Addresses table after context.Accounts.Add(newAccount) and context.SaveChanges()?

3. How should I generate the foreign key(AddressId) in the Accounts table?

Answer 1

[ForeignKey("Account")] makes AddressId take Accounts 's primary key, which is UserId .

Split that:

public class Addresses
{
    [Key]
    public int AddressId { get; set; }

    [ForeignKey("Account")]            // Not necessary
    public int AccountId { get; set; } // Necessary

    public virtual Accounts Account { get; set; }

    // Other properties...
}

You should set the primary key in an entity:

public void CreateUser(UserModel model)
{
    Addresses newAddress = new Addresses()
    {
        ShippingFirstName = "1",
        ShippingLastName = "1",
        ShippingAddress = "1",
        ShippingAddress2 = "1",
        ShippingCity = "1",
        ShippingState = "1",
        ShippingZip = "1",
        ShippingCountry = "1",
        ShippingPhone = "1",
        AddressId = 1 // Set primary key
    };

    // ...
}