Get IdentityUser by ID using MVC 5 Identity

Question

When creating another model Testimonial I store the active user's Id as the Author which is a string looking like: 00b9c6aa-010c-4cbd-ac16-c72d05e7906a. In another view I want to display the name and other user information associated with that Id for each Testimonial. The view will contain information from many different users, not just the actively logged one. I cannot figure out how to get a user their information by Id.

How do I get the IdentityUser by Id?

All of the tables containing the users are default plus some additional columns. Within the table named AspNetUsers, I've got Id, FirstName, Email, etc. The Id is the key value and I would like to know how to (within the controller for Testimonial) retrieve the information for a given Id.

Answer 1

IdentityConfig.cs // Configure the application user manager used in this application. UserManager is defined in ASP.NET Identity and is used by the application.

public class ApplicationUserManager : UserManager<ApplicationUser>
{
    public ApplicationUserManager(IUserStore<ApplicationUser> store)
        : base(store)
    {
    }

    public static ApplicationUserManager Create(IdentityFactoryOptions<ApplicationUserManager> options, IOwinContext context)
    {
        var manager = new ApplicationUserManager(new UserStore<ApplicationUser>(context.Get<ApplicationDbContext>()));
        // Configure validation logic for usernames
        manager.UserValidator = new UserValidator<ApplicationUser>(manager)
        {
            AllowOnlyAlphanumericUserNames = false,
            RequireUniqueEmail = true
        };
        // Configure validation logic for passwords
        manager.PasswordValidator = new PasswordValidator
        {
            RequiredLength = 6,
            RequireNonLetterOrDigit = false,
            RequireDigit = false,
            RequireLowercase = false,
            RequireUppercase = false,
        };
        manager.EmailService = new EmailService();
        var dataProtectionProvider = options.DataProtectionProvider;
        if (dataProtectionProvider != null)
        {
            manager.UserTokenProvider = new DataProtectorTokenProvider<ApplicationUser>(dataProtectionProvider.Create("ASP.NET Identity"));
        }
        return manager;
    }
}
public class ApplicationSignInManager : SignInManager<ApplicationUser, string>
{
    public ApplicationSignInManager(ApplicationUserManager userManager, IAuthenticationManager authenticationManager) :
        base(userManager, authenticationManager) { }

    public override Task<ClaimsIdentity> CreateUserIdentityAsync(ApplicationUser user)
    {
        return user.GenerateUserIdentityAsync((ApplicationUserManager)UserManager);
    }

    public static ApplicationSignInManager Create(IdentityFactoryOptions<ApplicationSignInManager> options, IOwinContext context)
    {
        return new ApplicationSignInManager(context.GetUserManager<ApplicationUserManager>(), context.Authentication);
    }
}

In your controller define the following properties

    private ApplicationUserManager _userManager;
    public ApplicationUserManager UserManager
    {
        get
        {
            return _userManager ?? HttpContext.GetOwinContext().GetUserManager<ApplicationUserManager>();
        }
        private set
        {
            _userManager = value;
        }
    }
    private ApplicationSignInManager _signInManager;

    public ApplicationSignInManager SignInManager
    {
        get
        {
            return _signInManager ?? HttpContext.GetOwinContext().Get<ApplicationSignInManager>();
        }
        private set { _signInManager = value; }
    }

You can use the following method in the controller

var user = await UserManager.FindByIdAsync("00b9c6aa-010c-4cbd-ac16-c72d05e7906a");

You can get the logged in user like the following

var user = await UserManager.FindByIdAsync(await SignInManager.GetVerifiedUserIdAsync());