MVC 5 EF6 中的多对多关系

Question

我正在使用 MVC 5 和 EF 6。

我的代码中有 3 个表：“Leads”、“Phones”、“LeadStatus”和一个连接表“LeadPhones”。 我想在索引视图中显示以下属性：

Leads.FullName
LeadStatus.Status
Phones.PhoneID

我应该如何配置 LeadController？

public partial class Leads
{
    public Leads()
    {
        this.LeadPhones = new HashSet<LeadPhones>();
    }

    [Key]
    public int LeadID { get; set; }
    public string Title { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string FullName { get { return NamePrefix + " " + FirstName + " " + LastName; } }
    public int LeadStatusID { get; set; } 

    public virtual LeadStatus LeadStatus { get; set; }
    public virtual ICollection<LeadPhones> LeadPhones { get; set; }
}

和

public partial class Phones
{
    public Phones()
    {
        this.AccountPhones = new HashSet<AccountPhones>();
        this.ContactPhones = new HashSet<ContactPhones>();
        this.EmployeePhones = new HashSet<EmployeePhones>();
        this.LeadPhones = new HashSet<LeadPhones>();
    }

    [Key]
    public int PhoneID { get; set; }           
    public string PhoneNo { get; set; }

    public virtual ICollection<LeadPhones> LeadPhones { get; set; }
}

和

public partial class LeadPhones
{
    [Key]
    public int LeadPhoneID { get; set; }
    public int LeadID { get; set; }
    public int PhoneID { get; set; }

    public virtual Leads Leads { get; set; }
    public virtual Phones Phones { get; set; }
}

和

public partial class LeadStatus
{
    public LeadStatus()
    {
        this.Leads = new HashSet<Leads>();
    }

    [Key]
    public int LeadStatusID { get; set; }
    public string Status { get; set; }

    public virtual ICollection<Leads> Leads { get; set; }
}

以下不起作用：

    public ActionResult Index()
    {            
        var leads = db.Leads.Include(l => l.LeadStatus).Include(l => l.LeadPhones);                       

        return View(leads);
    }

主要问题是“PhoneNo”。我怎么能从联结表中得到它？

Answer 1

从 LeadPhones 表中删除 LeadPhoneID 列 -- 这不是必需的，只会给您带来问题。删除您的课程中对 LeadPhones 的所有引用。将虚拟财产引导至电话（而非 LeadPhone）。 LeadPhones 对 Leads（不是 LeadPhones）拥有虚拟财产。

完成此操作后，您应该能够：

var leads = db.Leads.Include(l => l.LeadStatus).Include(l => l.Phones);

public partial class Lead
{
    public Lead()
    {
        this.Phones = new HashSet<Phone>();
    }

    [Key]
    public int LeadID { get; set; }
    public string Title { get; set; }
    public string FirstName { get; set; }
    public string LastName { get; set; }
    public string FullName { get { return NamePrefix + " " + FirstName + " " + LastName; } }
    public int LeadStatusID { get; set; } 

    public virtual LeadStatus LeadStatus { get; set; }
    public virtual ICollection<Phone> Phones { get; set; }
} 

public partial class Phone
{
    public Phone()
    {
        this.AccountPhones = new HashSet<AccountPhones>();
        this.ContactPhones = new HashSet<ContactPhones>();
        this.EmployeePhones = new HashSet<EmployeePhones>();
        this.Leads = new HashSet<Lead>();
    }

    [Key]
    public int PhoneID { get; set; }           
    public string PhoneNo { get; set; }

    public virtual ICollection<Lead> Leads { get; set; }
}   
public partial class LeadStatus
{
    public LeadStatus()
    {
        this.Leads = new HashSet<Lead>();
    }

    [Key]
    public int LeadStatusID { get; set; }
    public string Status { get; set; }

    public virtual ICollection<Lead> Leads { get; set; }
}

我还更正了您的多个课程。领先与领先。该类描述了单个潜在客户，因此应将其称为 Lead 而不是 Leads。电话与电话。