How to implement Custom UserStore (or custom authentication) in ASP.NET Core (not older versions!)

Question

I am trying to build new website with ASP.NET Core 1 (May 2016), and I need to implement different kind of sign-in procedures (not with SQL Server).

So I am trying implement MyOwnUserStore, where I want to override login procedures, but when I start the application the result is this exception:

InvalidOperationException: Unable to resolve service for type 'Microsoft.EntityFrameworkCore.DbContext' while attempting to activate 'LoginWebApp04.Services.MyOwnUserStore'.

My code is simple, new class:

public class MyOwnUserStore : UserStore<ApplicationUser>
{
    public MyOwnUserStore(DbContext context, IdentityErrorDescriber describer = null)
        : base(context, describer)
    {
    }

    ...
}

and modification of Startup.cs:

public void ConfigureServices(IServiceCollection services)
{
    // Add framework services.
    services.AddDbContext<ApplicationDbContext>(options => options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

    var idt = services.AddIdentity<ApplicationUser, IdentityRole>();
    idt.AddUserStore<MyOwnUserStore>();  // <-------------------------- HERE
    idt.AddEntityFrameworkStores<ApplicationDbContext>();
    idt.AddDefaultTokenProviders();

    services.AddMvc();

    // Add application services.
    services.AddTransient<IEmailSender, AuthMessageSender>();
    services.AddTransient<ISmsSender, AuthMessageSender>();
}

I have changed nothing else in my new project, and the project is created as ASP.NET Core Web Application with authentication = individual user accounts.

So what I need to do more to make the first run of my app without exception?

I have tried many examples from internet but all I have found are outdated.

Answer 1

The DI framework doesn't know what to resolve for the user store. Change DbContext in the constructor to ApplicationDbContext

public class MyOwnUserStore : UserStore<ApplicationUser> {
    public MyOwnUserStore(ApplicationDbContext context, IdentityErrorDescriber describer = null)
        : base(context, describer) {
    }
    ...
}

Change the order of when you add the user store. You need to add entity framework stored before adding user store.

public void ConfigureServices(IServiceCollection services) {
    // Add framework services.
    services.AddDbContext<ApplicationDbContext>(options => 
        options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

    services
        .AddIdentity<ApplicationUser, IdentityRole>()
        .AddEntityFrameworkStores<ApplicationDbContext>()
        .AddUserStore<MyOwnUserStore>()  // <----MOVED AFTER ADDING EF STORES
        .AddDefaultTokenProviders();

    services.AddMvc();

    // Add application services.
    services.AddTransient<IEmailSender, AuthMessageSender>();
    services.AddTransient<ISmsSender, AuthMessageSender>();
}