Question

我有一个名为 EnrollTrainee 的表格。我的EnrollTrainee模型类中有这些列：

[Key]
public int id { get; set; }

public int TraineeID { get; set; }      

public int TrainerID { ![enter image description here][1]get; set; }

public virtual CreateUsers user_userid { get; set; }

public virtual CreateUsers user_id { get; set; }

public DateTime dt { get; set; }

这两个列 TraineeID 和 TrainerID 将与表 CreateUser 中的 User_id 列进行映射。

这是 CreateUser 模型类

    public class CreateUsers
    {
    [Key]
      public int User_Userid { get; set; }

    [Required]
    [Display(Name="Enter User Name")]
    public string User_name { get; set; }

    [Required]
    [Remote("IsDomainIDExist", "Account", ErrorMessage = "Domain ID Already Exist")]
    [Display(Name = "Enter Domain ID")]
    public string User_username { get; set; }

    [Required]
    [DataType(DataType.Password)]
    [Display(Name = "Enter Password")]
    public string User_password { get; set; }

    [Required]
    [Display(Name = "Enter Department")]
    public string User_department { get; set; }

    [Required]
    [Remote("IsEmployeeIDExist", "Account", ErrorMessage = "Domain ID Already Exist")]
    [Display(Name = "Enter Employee ID")]
    public string User_employeeid { get; set; }

    [Required]
    [Display(Name="Select Role Type")]
    public int RoleID { get; set; }

    [Display(Name="Enable?")]
    public bool User_Enable { get; set; }

    [DataType(DataType.DateTime)]
    [Display(Name = "Date Time")]
    public DateTime dt { get; set; }

    public virtual RoleModel Role { get; set; }

 }

如何在EF CF中映射两个具有相同主键的外键？

Answer 1

这样的事情：

public class EnrollTrainee
{
    [Key]
    public int id { get; set; }

    public int TraineeID { get; set; }

    public virtual CreateUser Trainee { get; set; }

    public int TrainerID { get; set; }

    public virtual CreateUser Trainer { get; set; }

    public DateTime dt { get; set; }
}

internal class EnrollTraineeConfiguration:EntityTypeConfiguration<EnrollTrainee>
{
    public EnrollTraineeConfiguration()
    {
        ToTable("EnrollTrainee");
        Property(c => c.dt).HasColumnName("dt");
        Property(c => c.TraineeID).HasColumnName("TraineeID");
        Property(c => c.TrainerID).HasColumnName("TrainerID");
        HasKey(c => c.id);
        HasRequired(c => c.Trainee).WithMany().HasForeignKey(c=>c.TraineeId);
        HasRequired(c => c.Trainer).WithMany().HasForeignKey(c => c.TrainerId);
    }
}
public class Context: DbContext
{
     protected override void OnModelCreating(DbModelBuilder modelBuilder)
     {
          modelBuilder.Configurations.Add(new EnrollTraineeConfiguration());
          ......
     }
     ....
}

Answer 2

如果您使用的是MVC3或4，那么您可以使用Entity Framework映射来执行相同操作，这反过来将生成所需的类。您可以使用模型浏览器执行相同操作。

你需要做什么：

创建表格在表中创建PK和FK约束右键单击项目中解决方案资源管理器中的Model文件夹选择Add New Item，从“Data”类别中选择ADO.Net EF 4.x / 5.x. 单击确定它将打开一个向导，提供所需的参数，在路上选择它要求的表格。完成后，它将在.Edmx的上下文文件中创建一个.Edmx文件，我

如何在不同的表中映射具有相同主键的两个不同的外键？

2 个答案: