ASP.NET Core does not log me in

Question

EDIT: So After many failed attempts to figure out why this is not working I decided to create a project and choose to have user login implemented from there so it will configure everything for me. after that I just scraped the automated login/register code and replaced it with my own. everything works amazingly well. I am pretty sure in my original version I missed some needed parameter

I am trying to make a simple login function. but I cant seem to get it to work and it drives me crazy ..

so I do my shared folder under _layout.cshtml I have added this

 @inject SignInManager<IdentityUser> signInManager;
 and then just a little later inside my navbar I added this elements 

  <ul class="navbar-nav  ml-auto">
                        @if (signInManager.IsSignedIn(User)) {
                        <li class="nav-item">
                            <form method="post" asp-controller="User" asp-action="Logout">
                                <button type="submit" class="nav-link btn btn-link py-0" style="width:auto">
                                    Logout @User.Identity.Name
                                </button>
                            </form>
                        </li>
                        }
                        else {
                        <li class="nav-item">
                            <a class="nav-link text-dark" asp-area="" asp-controller="User" asp-action="Register">Register</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link text-dark" asp-area="" asp-controller="User" asp-action="Login">Login</a>
                        </li>
                        }
                    </ul>

and in my controller I added this I called this controller UserController.cs If I enter wrong login info . like wrong password or username it will tell me I that. so the connection with the database is no issue. but when I am send in my "Home" Index I am not logged it. as if it does not create a session I am not sure

   [HttpGet]
    public IActionResult Login()
    {
        return View();
    }
[HttpPost]
public async Task<IActionResult> Login(Login model)
{
    if (ModelState.IsValid)
    {
         
        var result = await signInManager.PasswordSignInAsync(model.UserName,model.Password,
            model.RememberMe,false);
        if (result.Succeeded)
        {
            //creates a temponary sign in session cookie. that cookie is going to be lost after the browser is closed
       
            return RedirectToAction("index", "home");
        }
        //if succeeded = false then ew llop through the error list

        
            ModelState.AddModelError(string.Empty,"Invalid Login");
      
    }

    return View(model);
}

Answer 1

Here is the whole working demo like below:

View(Login.cshtml):

@using Microsoft.AspNetCore.Identity
@model LoginViewModel
@inject SignInManager<IdentityUser> SignInManager

@{
    ViewData["Title"] = "Log in";
}

<h1>@ViewData["Title"].</h1>
<div class="row">
    <div class="col-md-8">
        <section>
            <form asp-controller="Account" asp-action="Login" asp-route-returnurl="@ViewData["ReturnUrl"]" method="post" class="form-horizontal" role="form">
                <h4>Use a local account to log in.</h4>
                <hr />
                <div asp-validation-summary="All" class="text-danger"></div>
                <div class="form-group">
                    <label asp-for="Email" class="col-md-2 control-label"></label>
                    <div class="col-md-10">
                        <input asp-for="Email" class="form-control" />
                        <span asp-validation-for="Email" class="text-danger"></span>
                    </div>
                </div>
                <div class="form-group">
                    <label asp-for="Password" class="col-md-2 control-label"></label>
                    <div class="col-md-10">
                        <input asp-for="Password" class="form-control" />
                        <span asp-validation-for="Password" class="text-danger"></span>
                    </div>
                </div>
                <div class="form-group">
                    <div class="col-md-offset-2 col-md-10">
                        <div class="checkbox">
                            <label asp-for="RememberMe">
                                <input asp-for="RememberMe" />
                                @Html.DisplayNameFor(m => m.RememberMe)
                            </label>
                        </div>
                    </div>
                </div>
                <div class="form-group">
                    <div class="col-md-offset-2 col-md-10">
                        <button type="submit" class="btn btn-default">Log in</button>
                    </div>
                </div>
                <p>
                    <a asp-action="Register" asp-route-returnurl="@ViewData["ReturnUrl"]">Register as a new user?</a>
                </p>
                <p>
                    <a asp-action="ForgotPassword">Forgot your password?</a>
                </p>
            </form>
        </section>
    </div>
    <div class="col-md-4">
        <section>
            <h4>Use another service to log in.</h4>
            <hr />
            @{
                var schemes = await SignInManager.GetExternalAuthenticationSchemesAsync();
                var loginProviders = schemes.ToList();
                if (loginProviders.Count == 0)
                {
                    <div>
                        <p>
                            There are no external authentication services configured. See <a href="http://go.microsoft.com/fwlink/?LinkID=532715">this article</a>
                            for details on setting up this ASP.NET application to support logging in via external services.
                        </p>
                    </div>
                }
                else
                {
                    <form asp-controller="Account" asp-action="ExternalLogin" asp-route-returnurl="@ViewData["ReturnUrl"]" method="post" class="form-horizontal" role="form">
                        <div>
                            <p>
                                @foreach (var provider in loginProviders)
                                {
                                    <button type="submit" class="btn btn-default" name="provider" value="@provider.Name" title="Log in using your @provider.Name account">@provider.Name</button>
                                }
                            </p>
                        </div>
                    </form>
                }
            }
        </section>
    </div>
</div>

@section Scripts {
    @{ await Html.RenderPartialAsync("_ValidationScriptsPartial"); }
}

Controller:

[Authorize]
public class AccountController : Controller
{
    private readonly UserManager<IdentityUser> _userManager;
    private readonly SignInManager<IdentityUser> _signInManager;

    public AccountController(
        UserManager<IdentityUser> userManager,
        SignInManager<IdentityUser> signInManager)
    {
        _userManager = userManager;
        _signInManager = signInManager;
    }
   
    // GET: /Account/Login
    [HttpGet]
    [AllowAnonymous]
    public IActionResult Login()
    {
        return View();
    }

    // POST: /Account/Login
    [HttpPost]
    [AllowAnonymous]
    [ValidateAntiForgeryToken]
    public async Task<IActionResult> Login(LoginViewModel model)
    {
        if (ModelState.IsValid)
        {
            var result = await _signInManager.PasswordSignInAsync(model.Email, model.Password, model.RememberMe, lockoutOnFailure: false);
            if (result.Succeeded)
            {
                return RedirectToAction("Index", "Home");
            }           
            else
            {
                ModelState.AddModelError(string.Empty, "Invalid login attempt.");
                return View(model);
            }
        }

        return View(model);
    }
}

DbContext:

public class ApplicationDbContext : IdentityDbContext
{
    public ApplicationDbContext(DbContextOptions options) : base(options) { }      
}

Startup.cs

public class Startup
{
    public Startup(IConfiguration configuration)
    {
        Configuration = configuration;
    }

    public IConfiguration Configuration { get; }

    // This method gets called by the runtime. Use this method to add services to the container.
    public void ConfigureServices(IServiceCollection services)
    {
        services.AddControllersWithViews();
        services.AddDbContext<ApplicationDbContext>(options =>
           options.UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));
        services.AddIdentityCore<IdentityUser>()
            .AddEntityFrameworkStores<ApplicationDbContext>()
            .AddSignInManager()
            .AddDefaultTokenProviders();

        services.AddAuthentication(o =>
        {
            o.DefaultScheme = IdentityConstants.ApplicationScheme;
            o.DefaultSignInScheme = IdentityConstants.ExternalScheme;
        })
        .AddIdentityCookies(o => { });
    }

    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IWebHostEnvironment env)
    {
        if (env.IsDevelopment())
        {
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
            app.UseHsts();
        }
        app.UseHttpsRedirection();
        app.UseStaticFiles();

        app.UseRouting();

        app.UseAuthentication();

        app.UseAuthorization();

        app.UseEndpoints(endpoints =>
        {
            endpoints.MapControllerRoute(
                name: "default",
                pattern: "{controller=Home}/{action=Index}/{id?}");
        });
    }
}

Result: