“FromSql”操作的结果中不存在所需的“CustomerId”列

Question

错误信息很明确：

''FromSql' 操作的结果中不存在所需的列 'CustomerId'

但不知何故，我真的没想到有一个 CustomerId？

错误发生在这里：

contacts = db.Contacts.FromSql("SIP_API_MONDIA_Contacts_sel").ToList();
addresses = db.Addresses.FromSql("SIP_API_MONDIA_Address_sel").ToList();

控制器：

  public IList<Customer> GetAllCustomers()
        {
            //Initialize the objects
            IList<Customer> customers = null;
            IList<Contacts> contacts = null;
            IList<Addresses> addresses = null;

            //Fetch the data from stored procedures
            customers = db.Customers.FromSql("SomeProcName").ToList();
            contacts = db.Contacts.FromSql("SomeProcName").ToList();
            addresses = db.Addresses.FromSql("SomeProcName").ToList();

            //Loop through customers and add the contact and addresses when required
            foreach(var item in customers)
            {
                item.Contacts = contacts.Where(x => x.Customer == item.Id).ToList();
                item.Addresses = addresses.Where(x => x.Customer == item.Id).ToList();
            }
            return customers;
        }

该模型：

public class Customer
    {
        public Guid Id { get; set; }
        public string Code { get; set; }
        public string Name { get; set; }
        public string VatCode { get; set; }
        public string ChamberOfCommerceCode { get; set; }
        public DateTime Modified { get; set; }
        public DateTime Created { get; set; }
        public string LanguageCode { get; set; }
        public decimal Discount { get; set; }
        public string CustomerManager { get; set; }
        public Guid PriceList { get; set; }
        public Guid PaymentCondition { get; set; }
       // public bool VatLiable { get; set; }
        public bool IsBlocked { get; set; }
        public bool IsProspect { get; set; }
        public bool IsSuspect { get; set; }
        public string Website { get; set; }
        public string DashboardUrl { get; set; }
        public string Email { get; set; }
        public string Phone { get; set; }
        public string Fax { get; set; }
        //     public ICollection<FreeFields> FreeFields { get; set; }
        //      public Dictionary<string, string> UknownElements { get; set; }
        public ICollection<Contacts> Contacts { get; set; }
        public ICollection<Addresses> Addresses { get; set; }
    }

    public class FreeFields
    {
        public string Key { get; set; }
        public string Value { get; set; }
    }

    public class Contacts
    {
        public Guid Id { get; set; }
        public string FirstName { get; set; }
        public string MiddleName { get; set; }
        public string LastName { get; set; }
        public string Initials { get; set; }
        public string Function { get; set; }    
        public Guid Customer { get; set; }
        public string Email { get; set; }
        public string Phone { get; set; }
        public string Mobile { get; set; }
        public string LanguageCode { get; set; }
        public bool IsMainContact { get; set; }
        public string Gender { get; set; }
        public string Username { get; set; }
    }
    public class Addresses
    {
        public Guid Id { get; set; }
        public string AddressLine1 { get; set; }
        public string AddressLine2 { get; set; }
        public string AddressLine3 { get; set; }
        public string Postcode { get; set; }
        public string City { get; set; }
        public string Country { get; set; }
        public string CountryCode { get; set; }
        public string Type { get; set; }
        public Guid Customer { get; set; }// This Property should be GUID instead of String..
        public bool IsMainAddress { get; set; }
        public string Route { get; set; }
        public string State { get; set; }
    }

我不完全确定“CustomerId”的错误意味着什么存储过程返回模型的 100% 准确值。

编辑以添加 sql 结果集 && DbContext 的打印 scrn：

public class IsahContext : DbContext
    {
        public  IsahContext()
        {

        }

        public IsahContext(DbContextOptions<IsahContext> options)
            : base(options)
        {
        }

        protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
        {
            if (!optionsBuilder.IsConfigured)
            {
                optionsBuilder.UseSqlServer(Setting.ConnectionString);
            }
        }

        protected override void OnModelCreating(ModelBuilder modelBuilder)
        {
        }

        //Entities will come here 
        public DbSet<Customer> Customers { get; set; }
        public DbSet<Addresses> Addresses { get; set; }
        public DbSet<Contacts> Contacts { get; set; }

    }

Answer 1

CustomerId是由 引入的一对多关系的外键的约定名称

public ICollection<Contacts> Contacts { get; set; }
public ICollection<Addresses> Addresses { get; set; }

类的集合导航属性 Customer。

虽然相关类Contacts和Addresses包含一个 property Guid Customer，但由于其名称，它不被识别为外键，因此它属于无外键属性类别。EF Core 假定有一个名为 的影子属性（和列）CustomerId。影子属性约定解释为：

当发现关系但在依赖实体类中找不到外键属性时，可以按照约定创建影子属性。在这种情况下，将引入影子外键属性。影子外键属性将被命名<navigation property name><principal key property name>（指向主体实体的依赖实体上的导航用于命名）。如果主键属性名称包含导航属性的名称，则名称将为<principal key property name>。如果依赖实体上没有导航属性，则使用主体类型名称来代替它。

为了将Customer属性映射为 FK，您应该使用foreignkey属性：

您可以使用数据注释来配置应将哪个属性用作给定关系的外键属性。这通常是在未按惯例发现外键属性时完成的。

提示
注释[ForeignKey]可以放置在关系中的任一导航属性上。它不需要继续依赖实体类中的导航属性。

例如（因为您在依赖实体中没有导航属性）：

[ForeignKey(nameof(Contacts.Customer))]
public ICollection<Contacts> Contacts { get; set; }

[ForeignKey(nameof(Addresses.Customer))]
public ICollection<Addresses> Addresses { get; set; }

或流畅的API：

modelBuilder.Entity<Customer>()
    .HasMany(customer => customer.Contacts)
    .WithOne() // no nav property
    .HasForeignKey(contact => contact.Customer); // the FK property

modelBuilder.Entity<Customer>()
    .HasMany(customer => customer.Addresses)
    .WithOne() // no nav property
    .HasForeignKey(address => address.Customer); // the FK property