不能得到一对一的相关对象

Question

我有实体：

public class User 
    { 
     public int UserId { get; set; } 
     public string UserName { get; set; } 
     public string Email { get; set; } 
     ... 
     public virtual Profile Profile { get; set; } 
     ... 
public class Profile 
    { 
     public int UserId { get; set; } 
     public string FirstName { get; set; } 
     public string LastName { get; set; } 

当我试图让用户我得到错误：

System.Data.Edm.EdmEntityType: : EntityType 'Profile' has no key defined. Define the key for this EntityType. 

当我改变实体：

public class User 
    { 
     [Key] 
     public int UserId { get; set; } 
     public string UserName { get; set; } 
     public string Email { get; set; } 
     ... 
     public virtual Profile Profile { get; set; } 
     ... 
public class Profile 
    { 
     [Key] 
     public int UserId { get; set; } 
     public string FirstName { get; set; } 
     public string LastName { get; set; } 

我收到错误：

{"Invalid column name 'Profile_UserId'."} 

我在做什么错？

Answer 1

根据http://blog.bennymichielsen.be/2011/06/02/entity-framework-4-1-one-to-one-mapping/它可以工作：

public class User 
{ 
     [Key] 
     public int UserId { get; set; } 
     public string UserName { get; set; } 
     public string Email { get; set; } 
     public virtual Profile Profile { get; set; } 
} 

public class Profile 
{ 
     [Key] 
     public int UserId { get; set; } 
     public string FirstName { get; set; } 
     public string LastName { get; set; } 
     [Required] 
     public virtual User User { get; set;} 
}