ASP.NET Applicationuser ICollection实体插入UserId为null

Question

I have ApplicationUser class and with a ICollection like below:

public class ApplicationUser : IdentityUser
{
    public virtual ICollection<Info> Infos { get; set; }           

    public async Task<ClaimsIdentity> GenerateUserIdentityAsync(UserManager<ApplicationUser> manager)
    {            
        var userIdentity = await manager.CreateIdentityAsync(this, DefaultAuthenticationTypes.ApplicationCookie);
        return userIdentity;
    }        
}

And Info Class:

public partial class Info
{
    public int Id { get; set; }

    [Required]
    [StringLength(128)]
    public string UserId { get; set; }

    [Required]
    public string Address { get; set; }

    public virtual ApplicationUser AspNetUser { get; set; }
}

And when I create a applicationuser like this:

IList<Info> infos = new List<Info>() { new Info() { Address = "testAddr"} };
var user = new ApplicationUser { UserName = model.Email, Email = model.Email, Addresses = a };
var result = await UserManager.CreateAsync(user, model.Password);

This will occur validation error:UserId is required.Is any thing I missed?

Answer 1

In your Infos class, the UserId property doesn't relate to the navigation property AspNetUser at all, this is why it is failing. You either need to name them correctly:

[Required]
[StringLength(128)]
public string UserId { get; set; }

public virtual ApplicationUser User { get; set; }

Or you can add a ForeignKey attribute:

[Required]
[StringLength(128)]
public string UserId { get; set; }

[ForeignKey("UserId")]
public virtual ApplicationUser AspNetUser { get; set; }

Answer 2

From what I understand from your code , you need to store multiple address associated to a user. Your UserId property is decorated with [Required] attribute therefore you will need to store UserId along with Address , the main problem is that UserId will be auto generated after you do UserManager.CreateAsync . So what I suggest is that you assign the list of address after user has been successfully created.

`var user = new ApplicationUser { UserName = model.Email, Email = model.Email,Addresses =a };
var result = await UserManager.CreateAsync(user, model.Password);
if(result.Succeeded)
{
     //assign list of address to user
     IList<Info> infos = new List<Info>() { new Info() { Address ="testAddr",UserId = User.Identity.GetUserId()} }
     dbcontext.SaveChanges()
     //login here
}`

Hope it helps. :-)

Answer 3

Do you want UserId to be auto-incremented? Because right now it is not set anywhere. You receive this error because you defined that this field is required:

 [Required]
 [StringLength(128)]
 public string UserId { get; set; }