使用EF6代碼優先，參考相同的屬性名稱

Question

如何將Customer類中的ShippingAddressId和BillingAddressId屬性引用到Address類，該類具有名爲AddressId的不同關鍵字？

運行更新的數據庫-verbose導致錯誤：

Unable to determine the principal end of an association between the types 'Project1.Customer' and 'Project1.Address'. The principal end of this association must be explicitly configured using either the relationship fluent API or data annotations.

public class Customer 
{ 
    public int CustomerId { get; set; } 
    public string FirstName { get; set; } 
    public string LastName { get; set; } 
    public string Email { get; set; } 
    public int ShippingAddressId { get; set; } 
    public int BillingAddressId { get; set; } 
} 

public class Address 
{ 
    public int AddressId { get; set; } 
    public string Line1 { get; set; } 
    public string Line2 { get; set; } 
    public string City { get; set; } 
    public string StateProvince { get; set; } 
    public string Zip{ get; set; } 
    public string Country { get; set; } 

    public virtual Customer Customer { get; set; } 
} 

Answer 1

public class Customer 
{ 
    public int CustomerId { get; set; } 
    public string FirstName { get; set; } 
    public string LastName { get; set; } 
    public string Email { get; set; } 

    public virtual Address ShippingAddress { get; set; } 
    public int ShippingAddressId { get; set; } 

    public virtual Address BillingAddress { get; set; } 
    public int BillingAddressId { get; set; } 
} 

public class Address 
{ 
    public int AddressId { get; set; } 
    public string Line1 { get; set; } 
    public string Line2 { get; set; } 
    public string City { get; set; } 
    public string StateProvince { get; set; } 
    public string Zip { get; set; } 
    public string Country { get; set; } 

    public ICollection<Customer> CustomersWhereShipping { get; set; } 
    public ICollection<Customer> CustomersWhereBilling { get; set; } 
} 

您ALSE必須自定義邏輯添加到您的DbContext：

protected override void OnModelCreating(DbModelBuilder modelBuilder) 
{ 
    modelBuilder.Entity<Customer>() 
     .HasRequired<Address>(c => c.BillingAddress) 
     .WithMany(a => a.CustomersWhereBilling) 
     .HasForeignKey(c => c.BillingAddressId); 

    modelBuilder.Entity<Customer>() 
     .HasRequired<Address>(c => c.ShippingAddress) 
     .WithMany(a => a.CustomersWhereShipping) 
     .HasForeignKey(c => c.ShippingAddressId); 
}