c# - 无法获得一对一的相关对象

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; }

当我尝试获取用户时出现错误：

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

当我将实体更改为：

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; }

我得到错误：

{"Invalid column name 'Profile_UserId'."}

我究竟做错了什么？

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;}
}