在EF 5定义导航属性，代码首先迁移

Question

见我的模型

public class UsersContext : DbContext 
     { 
      public UsersContext() 
       : base("DefaultConnection") 
      { 
      } 

      public DbSet<UserProfile> UserProfiles { get; set; } 
      public DbSet<Files> Files { get; set; } 
     } 

     [Table("UserProfile")] 
     public class UserProfile 
     { 
      [Key] 
      [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] 
      public int UserId { get; set; } 
      public string UserName { get; set; } 
     } 

    [Table("Files")] 
    public class Files 
    { 
     [Key] 
     [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] 
     [Display(Name = "FileID")] 
     public int FileID { get; set; } 

     [Required] 
     [ForeignKey("UserId")] // this is what I have tried 
     [Display(Name = "For User")] 
     public int UserId { get; set; } 

     [Display(Name = "Description")] 
     public string Desc { get; set; } 

     [Required] 
     [Display(Name = "Document Upload")] 
     public string DocumentPath { get; set; } 
    } 

我想是定义在文件表中的用户ID的外键。我该怎么做。我尝试使用[ForeignKey]属性。但它在PCM中执行update-database -verbose时给我这个错误。

错误 - 导航属性'UserId'不是 类型'文件'的声明属性。验证它是否未被明确地从 模型中排除，并且它是有效的导航属性。

Answer 1

[Table("Files")] 
public class Files 
{ 
    [Key] 
    [DatabaseGeneratedAttribute(DatabaseGeneratedOption.Identity)] 
    [Display(Name = "FileID")] 
    public int FileID { get; set; } 

    [Required] 

    [Display(Name = "For User")] 
    public int UserId { get; set; } 


    [Display(Name = "Description")] 
    public string Desc { get; set; } 

    [Required] 
    [Display(Name = "Document Upload")] 
    public string DocumentPath { get; set; } 

    [ForeignKey("UserId")] // this is what I have tried 
    public virtual UserProfile UserProfile { get; set; } 
}