[英]How to get table using relationships in Entity Framework
I am using EF Core 2.1 and i'm trying to get Profile from Authentication but every time i get it i found it null and i don't now where is the problem. 我正在使用EF Core 2.1,并且我尝试从身份验证获取配置文件,但是每次获取它时,我都发现它为null,现在不是问题所在了。 And for authentication i can get profiles.
对于身份验证,我可以获取配置文件。
Entities: 实体:
[Table("USER_AUTHENTICATION")]
public class Authentication
{
public int ID { get; set; }
//...some code
[ForeignKey("ProfileID")]
public Profile Profile { get; set; }
public virtual int ProfileID { get; set; }
}
[Table("USER_PROFILE")]
public class Profile
{
public Profile()
{
Authentication = new HashSet<Authentication>();
}
public int ID { get; set; }
//... some code
public virtual ICollection<Authentication> Authentication { get; set; }
}
DataContext 数据上下文
public DataContext(DbContextOptions<DataContext> options) : base(options) { }
public DbSet<Authentication> Authentications { get; set; }
public DbSet<Profile> Profiles { get; set; }
public Profile GetById(int currentUserId)
{
var user = _context.Authentications.Find(currentUserId);
Console.WriteLine(user.Profile); //<--- here is the probelm null//
return _context.Profiles.Find(user.ProfileID);
}
How can i use relations with correct way 我如何以正确的方式使用关系
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