Question

我有以下简化类：

public class Customer
{
   public int Id {get; set;}
   public string FirstName {get; set;}
   public string LastName {get; set;}
   public List<Account> Accounts {get; set;}
}

public class Account
{ 
   public int Id {get; set;}
   public Customer Customer {get; set;}
   public int CustomerId {get; set;}
   public string AccountNumber {get; set;}
   public double AccountBalance {get; set;}
   public int? SupercededAccountId {get; set;}
}

因此，使用帐户类我需要访问取代帐户，这只是另一个帐户。我以超级账户的ID形式记录了被取消的账户。虽然我意识到这是丑陋和错误的，但我已经在Account类中添加了一个方法来检索我需要的帐户：

public Account SupercededAccount()
{
    if (SupercededAccountId != null)
    {
       using (DataContext db = new DataContext())
       {
          Account supercededAccount = db.Accounts.Find(SupercededAccountId);
          return supercededAccount;
        }
     }
     else return null;               
}

我不仅需要在帐户视图中访问已取代的Account对象，还需要访问报告和后台任务，因此我希望以某种方式成为Model类的一部分。获取我需要的超级账户价值的正确方法是什么？

Answer 1

为已取代的帐户

创建导航器

public class Account
{ 
   [Key]
   public int Id {get; set;}

   [ForgienKey("Customer")]
   public int CustomerId {get;set;}
   //navigator to customer
   public virtual Customer Customer {get; set;}
   public string AccountNumber {get; set;}
   public double AccountBalance {get; set;}

   [ForgienKey("SupercededAccount")]
   public int? SupercededAccountId {get; set;}

   public virtual Account SupercededAccount {get;set;}
}

public class Customer
{
   [Key]
   public int Id {get; set;}
   public string FirstName {get; set;}
   public string LastName {get; set;}

   public virtual ICollection<Account> Accounts {get; set;}
}

MVC - 实体框架 - 这属于哪里？

1 个答案: