Using Neo4jUserManager - asp.net-mvc

Question

I'm new at Neo4j and I'm going to use neo4j.AspNet.Identity for my authentication and authorization. I'm using neo4jUserManager and also neo4jUserStore.But when I run the application, in Neo4jUserManager create method I'll face with NullExceptionReference and I don't know why? Can Anybody help me?
Below is my code
public class Neo4jUserManager : UserManager<ApplicationUser>
{
public Neo4jUserManager(IUserStore<ApplicationUser> store)
: base(store)
{
}
public async Task SetLastLogin()
{
// Store.FindByIdAsync()
}
public static Neo4jUserManager Create(IdentityFactoryOptions<Neo4jUserManager> options, IOwinContext context)
{
var graphClientWrapper = context.Get<GraphClientWrapper>();
var manager = new Neo4jUserManager(new Neo4jUserStore<ApplicationUser>(graphClientWrapper.GraphClient));
// Configure validation logic for usernames
// manager.UserValidator = new UserValidator<Neo4jUser>(manager)
// {
// AllowOnlyAlphanumericUserNames = false,
// RequireUniqueEmail = true
// };
manager.PasswordValidator = new PasswordValidator
{
RequiredLength = 6,
RequireNonLetterOrDigit = true,
RequireDigit = true,
RequireLowercase = true,
RequireUppercase = true
};
// Configure user lockout defaults
manager.UserLockoutEnabledByDefault = false;
manager.DefaultAccountLockoutTimeSpan = TimeSpan.FromMinutes(5);
manager.MaxFailedAccessAttemptsBeforeLockout = 5;
// Register two factor authentication providers. This application uses Phone and Emails as a step of receiving a code for verifying the user
// You can write your own provider and plug it in here.
// manager.RegisterTwoFactorProvider("Phone Code", new PhoneNumberTokenProvider<Neo4jUser>
// {
// MessageFormat = "Your security code is {0}"
// });
// manager.RegisterTwoFactorProvider("Email Code", new EmailTokenProvider<Neo4jUser>
// {
// Subject = "Security Code",
// BodyFormat = "Your security code is {0}"
// });
// manager.EmailService = new EmailService();
// manager.SmsService = new SmsService();
var dataProtectionProvider = options.DataProtectionProvider;
if (dataProtectionProvider != null)
{
manager.UserTokenProvider =
new DataProtectorTokenProvider<ApplicationUser>(dataProtectionProvider.Create("ASP.NET Identity"));
}
return manager;
}
}

Answer 1

To setup the graphClientWrapper, you can do this:
var gc = new GraphClient(new Uri("http://localhost.:7474/db/data"));
gc.Connect();
var graphClientWrapper = new GraphClientWrapper(gc);
var manager = new Neo4jUserManager(new Neo4jUserStore<ApplicationUser>(graphClientWrapper.GraphClient));
Also, as a side I would read up on how to use Owin. It should have been obvious to you that you're trying to pull from an IOwinContext object, and that if you're getting null you should investigate how to set that up. I imagine less than 5 minutes on Google would have helped you. OR just looking at what calls that method would have shown you how the EntityFramework was being setup in the template you're modifying.