Question

我有两个班级，其中Plan的列表为PlanTask，如下所示。但是，当它最初制作时，外键的属性没有从PlanTask转到Plan。但是现在我需要Plan上的PlanTask ID。我的问题在于，由于这两者之间存在多对多的关系，Entity Framework创建了一个外键列。但是由于我没有访问该列的属性，我无法访问该ID。所以我的问题是，我可以以某种方式访问自动生成的列，或者我可以编辑我的类，以便我不删除已存在的数据。

安排：

public class Plan
{
    public int PlanId { get; set; }
    [DisplayName("Navn")]
    public string Name { get; set; }
    public IList<PlanTask> Tasks { get; set; }
    public bool IsActive { get; set; }
    public ICollection<Department> Departments { get; set; }
    public bool IsCompleted { get; set; }
    public PlanStages Stage { get; set; }
    public DateTime? ApprovedDate { get; set; }
    [DisplayName("Ejer")]
    public User Owner { get; set; }
    [DisplayName("Ejer e-mail")]
    public string OwnerMail { get; set; }
}

PlanTask：

public class PlanTask
{
    public int PlanTaskId { get; set; }
    public bool IsActive { get; set; }

    [DisplayName("Beskrivelse/Årsag")]
    [Required(ErrorMessage = "Indtast venligst en beskrivelse/årsag")]
    public string Description { get; set; }

    [DisplayName("Løsning")]
    public string Solution { get; set; }

    [DisplayName("Ansvarlig e-Mail")]
    [Required(ErrorMessage = "Indtast venligst den ansvarliges mail")]
    public string ManagerMail { get; set; }

    [DisplayName("Ansvarlig navn")]
    [Required(ErrorMessage = "Indtast venligst den ansvarliges navn")]
    public string ManagerName { get; set; }

    [DisplayName("Videresend til navn")]
    public string ForwardName { get; set; }

    [DisplayName("Videresend til e-Mail")]
    public string ForwardMail { get; set; }

    [DisplayName("Dato udført")]
    [DataType(DataType.Date)]
    [DisplayFormat(DataFormatString = "{0:yyyy-MM-dd}", ApplyFormatInEditMode = true)]
    public DateTime? DateCompleted { get; set; }

    [DisplayName("Deadline for udførelse")]
    public DateTime? Deadline { get; set; }

    [DisplayName("Dato der er fulgt op")]
    public DateTime? FollowupDate { get; set; }

    [DisplayName("Påmindelses dato")]
    public DateTime? ReminderDate { get; set; }

    [DisplayName("Vedhæft fil")]
    public string FileName { get; set; }
}

的DataContext：

public class DataContext : IdentityDbContext<User>
{
    public DataContext() : base("DefaultConnection")
    {

    }
    protected override void OnModelCreating(DbModelBuilder modelBuilder)
    {
        modelBuilder.Entity<User>().ToTable("AspNetUsers");
        modelBuilder.Entity<IdentityUserRole>().ToTable("AspNetUserRoles");
        modelBuilder.Entity<IdentityUserLogin>().ToTable("AspNetUserLogins");
        modelBuilder.Entity<IdentityUserClaim>().ToTable("AspNetUserClaims");
        modelBuilder.Entity<IdentityRole>().ToTable("AspNetRoles");


        modelBuilder.Entity<IdentityUserLogin>().HasKey<string>(l => l.UserId);
        modelBuilder.Entity<IdentityRole>().HasKey<string>(r => r.Id);
        modelBuilder.Entity<IdentityUserRole>().HasKey(r => new { r.RoleId, r.UserId });


        modelBuilder.Entity<User>()
            .HasMany(x => x.Departments)
            .WithMany(c => c.Users);

        modelBuilder.Entity<Department>()
            .HasMany(x => x.Users)
            .WithMany(c => c.Departments);


        base.OnModelCreating(modelBuilder);


    }

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

    public DbSet<Template> Templates { get; set; }
    public DbSet<Section> Sections { get; set; }
    public DbSet<Question> Questions { get; set; }
    public DbSet<SubmittedSheet> SubmittedSheets { get; set; }
    public DbSet<SubmittedQuestion> SubmittedQuestions { get; set; }
    public DbSet<Department> Departments { get; set; }
    public DbSet<Role> WorkRoles { get; set; }
    public DbSet<Actionplan> Plans { get; set; }
    public DbSet<ActionPlanTask> PlanTasks { get; set; }


    //public DbSet<User> Users { get; set; }
}

Answer 1

或者我可以编辑我的课程，以便我不会删除已经存在的数据。

是。只需添加

TransactionVerificationException.ContractConstraintRejection

并确保它与生成的列的名称完全匹配。您可以使用属性。

稍微小心地测试它，但是当你正确地执行它然后执行添加迁移时，新的迁移应该是空的。

访问实体框架自动生成的FK列

1 个答案: