'No database provider has been configured for

.Net Core 1.0.0 - SDK Preview 2 (x64)

.Net Core 1.0.0 - VS "15" Preview 2 (x64)

.Net Core 1.0.0 - Runtime (x64)

So, we updated an RC1 app to the latest versions above. After many hours of switching references, it's running. However, when logging in (AccountController/Login), I am getting an error at:

public class AccountController : BaseController
{
    public UserManager<ApplicationUser> UserManager { get; private set; }
    public SignInManager<ApplicationUser> SignInManager { get; private set; }
    private readonly IEmailSender EmailSender;

    public AccountController(UserManager<ApplicationUser> userManager, SignInManager<ApplicationUser> signInManager, IEmailSender emailSender)
    {
        UserManager = userManager;
        SignInManager = signInManager;
        EmailSender = emailSender;
    }

    // GET: /Account/Login
    [HttpGet]
    [AllowAnonymous]
    public IActionResult Login(string returnUrl = null)
    {
        ViewBag.ReturnUrl = returnUrl;
        return View();
    }

    //
    // POST: /Account/Login
    [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Login(ViewModels.Account.LoginViewModel model, string returnUrl = null)
    {
        if (ModelState.IsValid)
        {
            // Errs this next line
            var result = await SignInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, false); // <-- ERRS HERE '.PasswordSignInAsync'
            if (result.Succeeded)
                return RedirectToLocal(returnUrl);

            ModelState.AddModelError("", "Invalid email or password.");
            return View(model);
        }

        // If we got this far, something failed, redisplay form
        return View(model);
    }

It blows up with the following error message:

InvalidOperationException: No database provider has been configured for this DbContext. A provider can be configured by overriding the DbContext.OnConfiguring method or by using AddDbContext on the application service provider. If AddDbContext is used, then also ensure that your DbContext type accepts a DbContextOptions object in its constructor and passes it to the base constructor for DbContext.

Here is the Startup.cs:

public void ConfigureServices(IServiceCollection services)
    {
        services.Configure<AppSettings>(Configuration.GetSection("AppSettings"));

        // Add EF services to the services container.
        services.AddEntityFrameworkSqlServer()
           .AddDbContext<LogManagerContext>(options =>
              options.UseSqlServer(Configuration["Data:DefaultConnection:Connectionstring"]));

        services.AddSingleton(c => Configuration);

        // Add Identity services to the services container.
        services.AddIdentity<ApplicationUser, IdentityRole>()
            .AddEntityFrameworkStores<LogManagerContext>()
            .AddDefaultTokenProviders();


        // Add MVC services to the services container.
        services.AddMvc();

        services.AddTransient<IHttpContextAccessor, HttpContextAccessor>();

        //Add all SignalR related services to IoC. - Signal R not ready yet - Chad
        //services.AddSignalR();

        //Add InMemoryCache
        services.AddMemoryCache();

        services.AddSession(options =>
        {
            options.IdleTimeout = System.TimeSpan.FromHours(1);
            options.CookieName = ".LogManager";
        });

        // Uncomment the following line to add Web API servcies which makes it easier to port Web API 2 controllers.
        // You need to add Microsoft.AspNet.Mvc.WebApiCompatShim package to project.json
        // services.AddWebApiConventions();
        // Register application services.
        services.AddTransient<IEmailSender, AuthMessageSender>();

    }

    // Configure is called after ConfigureServices is called.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env, ILoggerFactory loggerFactory)
    {
        app.UseSession();

        // Configure the HTTP request pipeline.
        // Add the console logger.
        //loggerFactory.MinimumLevel = LogLevel.Information; - moved to appsettings.json -chad
        loggerFactory.AddConsole();
        loggerFactory.AddDebug();

        loggerFactory.AddNLog();

        // Add the following to the request pipeline only in development environment.
        if (env.IsDevelopment())
        {
            app.UseBrowserLink();
            app.UseDeveloperExceptionPage();
            //app.UseDatabaseErrorPage(DatabaseErrorPageOptions.ShowAll);
        }
        else
        {
            // Add Error handling middleware which catches all application specific errors and
            // sends the request to the following path or controller action.
            app.UseExceptionHandler("/Home/Error");
        }

        env.ConfigureNLog("NLog.config");

        // Add static files to the request pipeline.
        app.UseStaticFiles();

        // Add cookie-based authentication to the request pipeline.
        app.UseIdentity();

        //SignalR
        //app.UseSignalR();

        // Add MVC to the request pipeline.
        app.UseMvc(routes =>
        {
            routes.MapRoute(
             name: "default",
             template: "{controller}/{action}/{id?}",
             defaults: new { controller = "Home", action = "Index" }
             );

            // Uncomment the following line to add a route for porting Web API 2 controllers.
            // routes.MapWebApiRoute("DefaultApi", "api/{controller}/{id?}");
        });
    }

And here's the Context:

public class ApplicationUser : IdentityUser
{
    // Add Custom Profile Fields
    public string Name { get; set; }
}

public class LogManagerContext : IdentityDbContext<ApplicationUser>
{
    public DbSet<LogEvent> LogEvents { get; set; }
    public DbSet<Client> Clients { get; set; }
    public DbSet<LogEventsHistory> LogEventsHistory { get; set; }
    public DbSet<LogEventsLineHistory> LogEventsLineHistory { get; set; }
    public DbSet<LogRallyHistory> LogRallyHistory { get; set; }
    public DbSet<Flag> Flags { get; set; }
    protected override void OnModelCreating(ModelBuilder builder)
    {

        builder.Entity<LogEvent>().HasKey(x => x.LogId);
        builder.Entity<LogEvent>().ToTable("LogEvents");
        builder.Entity<Client>().HasKey(x => x.ClientId);
        builder.Entity<Client>().ToTable("Clients");
        builder.Entity<LogEventsHistory>().HasKey(x => x.HistoryId);
        builder.Entity<Flag>().HasKey(x => x.FlagId);
        builder.Entity<Flag>().ToTable("Flags");
        builder.Entity<LogRallyHistory>().HasKey(x => x.HistoryId);
        builder.Entity<LogEventsLineHistory>().HasKey(x => x.LineHistoryId);

        base.OnModelCreating(builder);
    }

回答1:

If AddDbContext is used, then also ensure that your DbContext type accepts a DbContextOptions object in its constructor and passes it to the base constructor for DbContext.

The error message says your DbContext(LogManagerContext ) needs a constructor which accepts a DbContextOptions. But i couldn't find such a constructor in your DbContext. So adding below constructor probably solves your problem.

    public LogManagerContext(DbContextOptions options) : base(options)
    {
    }

Edit for comment

If you don't register IHttpContextAccessor explicitly, use below code:

services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();

回答2:

I could resolve it by overriding Configuration in MyContext through adding connection string to the DbContextOptionsBuilder:

protected override void OnConfiguring(DbContextOptionsBuilder optionsBuilder)
    {
        if (!optionsBuilder.IsConfigured)
        {
            IConfigurationRoot configuration = new ConfigurationBuilder()
               .SetBasePath(Directory.GetCurrentDirectory())
               .AddJsonFile("appsettings.json")
               .Build();
            var connectionString = configuration.GetConnectionString("DbCoreConnectionString");
            optionsBuilder.UseSqlServer(connectionString);
        }
    }