MVC5 中的 MVC4 到 MVC5 ICollection？

Question

以前我在编写 MVC4 应用程序，这些是我的类：Ticket、Category、Department、Depot 和 User（现在是 IdentityModels.cs 中的身份用户）

类之间的关系如下：

一对多用户到票（一个用户可以打开很多票）

一对多类别到工单（一张工单可以有一个类别）

部门到用户一对一（一个用户只能有一个部门）

一对一 Depot 到用户（一个用户只能拥有一个 Depot）

我的问题是因为我已经从 MVC4 升级到 MVC5，MVC5 用户必须从 IdentityUser 派生，所以我必须删除我的 User.cs 并将代码放入我的 ApplicationUser : IdentityUser 类（如下所示）

这样做之后，我的 public virtual ICollection<User> Users { get; set; } 或 public virtual User User { get; set; } 类将出现错误，因为它们没有引用任何东西（因为我已经删除了我的 User 类）。

找不到类型或命名空间名称“用户”（您是否缺少 using 指令或程序集引用？）

我需要将该代码更改为什么，以便它引用我的ApplicationUser : IdentityUser 类？

IdentityModels.cs（包括派生自 Identity User 的新用户类）

   public class ApplicationUser : IdentityUser
    {
        public async Task<ClaimsIdentity> 
            GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
        {
            var userIdentity = await manager
                .CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
            return userIdentity;
        }
    public bool IsAdministrator { get; set; }
    [StringLength(50, MinimumLength = 1)]

    public string LastName { get; set; }
    [StringLength(50, MinimumLength = 1, ErrorMessage = "First name cannot be longer than 50 characters.")]

    [Column("FirstName")]
    public string FirstMidName { get; set; }

    public string FullName
    {
        get { return FirstMidName + " " + LastName; }
    }
    [DataType(DataType.Date)]
    [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
    public DateTime EnrollmentDate { get; set; }
    public int DepartmentID { get; set; }
    [ForeignKey("DepartmentID")]
    public virtual Department Department { get; set; }
    public int DepotID { get; set; }
    [ForeignKey("DepotID")]
    public virtual Depot Depot { get; set; }
    public virtual ICollection<Ticket> Tickets { get; set; }
}


public class ApplicationRole : IdentityRole
{
    public ApplicationRole() : base() { }
    public ApplicationRole(string name) : base(name) { }
    public string Description { get; set; }

}


public class ApplicationDbContext : IdentityDbContext<ApplicationUser>
{
    public ApplicationDbContext()
        : base("DefaultConnection", throwIfV1Schema: false)
    {
    }


    public DbSet<Ticket> Tickets { get; set; }
    public DbSet<Category> Categories { get; set; }
    public DbSet<Department> Departments { get; set; }
    public DbSet<Depot> Depots { get; set; }

    static ApplicationDbContext()
    {
        Database.SetInitializer<ApplicationDbContext>(new ApplicationDbInitializer());
    }

    public static ApplicationDbContext Create()
    {
        return new ApplicationDbContext();
    }
}

仓库.cs

public class Depot
{
    public int DepotID { get; set; }
    [StringLength(50, MinimumLength = 1)]
    public string DepotName { get; set; }
    public virtual ICollection<User> Users { get; set; } <--Error
}

Department.cs

public class Department
{

    public int DepartmentID { get; set; }

    [StringLength(50, MinimumLength = 1)]
    public string DepartmentName { get; set; }

    public virtual ICollection<User> Users { get; set; } <--Error
}

Ticket.cs

public class Ticket
{
    public int? TicketID { get; set; }
    [Required(ErrorMessage = "Please enter the description")]
    public string Issue { get; set; }
    [Display(Name = "Administrator")]
    [Required(ErrorMessage = "Please select the Administrator")]
    public int IssuedTo { get; set; }
    public int Author { get; set; }

    [DisplayFormat(NullDisplayText = "No Priority")]
    public Priority Priority { get; set; }
    [ForeignKey("CategoryID")]
    public virtual Category Category { get; set; }
    public int CategoryID { get; set; }
    public int UserID { get; set; }
    [ForeignKey("UserID")]
    public virtual User User { get; set; } <--Error
}

解决方案中未包含旧的 user.cs 文件

public class User
{
    public int UserID { get; set; }

    public bool IsAdministrator { get; set; }
    [StringLength(50, MinimumLength = 1)]
    public string LastName { get; set; }
    [StringLength(50, MinimumLength = 1, ErrorMessage = "First name cannot be longer than 50 characters.")]

    [Column("FirstName")]
    public string FirstMidName { get; set; }

    public string FullName
    {
        get { return FirstMidName +" "+ LastName; }
    }
    [DataType(DataType.Date)]
    [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
    public DateTime EnrollmentDate { get; set; }

    public int DepartmentID { get; set; }
    [ForeignKey("DepartmentID")]
    public virtual Department Department { get; set; }
    public int DepotID { get; set; }
    [ForeignKey("DepotID")]
    public virtual Depot Depot { get; set; }
    public virtual ICollection<Ticket> Tickets { get; set; }


}

Configuration.cs的开始（种子方法）

internal sealed class Configuration : DbMigrationsConfiguration<RecreationalServicesTicketingSystem.DAL.IssueContext>
{
    public Configuration()
    {
        AutomaticMigrationsEnabled = false;
    }

    protected override void Seed(RecreationalServicesTicketingSystem.DAL.IssueContext context)
    {

Answer 1

您基本上是在重新创建实体之间的关系/导航。

仓库.cs

public class Depot {
    //....code removed for brevity
    public virtual ICollection<ApplicationUser> Users { get; set; } // fixed
}

Department.cs

public class Department {
    //....code removed for brevity
    public virtual ICollection<ApplicationUser> Users { get; set; } // fixed
}

Ticket.cs

public class Ticket {
    //....code removed for brevity
    public string UserID { get; set; } // fixed
    [ForeignKey("UserID")]
    public virtual ApplicationUser User { get; set; } // fixed
}