fix: пофиксил ошибку из-за того, что не изменил наследование пользователя на IdentityUser.

PhoneStore/Controllers/AccountController.cs

@@ -66,5 +66,13 @@ namespace PhoneStore.Controllers
             
             return View(model);
         }
+        
+        [HttpPost]
+        [ValidateAntiForgeryToken]
+        public async Task<IActionResult> LogOff()
+        {
+            await _accountService.LogOf();
+            return RedirectToAction("Index", "Phones");
+        }
     }
 }
\ No newline at end of file

PhoneStore/Models/MobileContext.cs

+using Microsoft.AspNetCore.Identity.EntityFrameworkCore;
 using Microsoft.EntityFrameworkCore;
 
 namespace PhoneStore.Models
 {
-    public class MobileContext : DbContext
+    public class MobileContext : IdentityDbContext<User, Role, int>
     {
         public DbSet<Phone> Phones { get; set; }
         public DbSet<Order> Orders { get; set; }

PhoneStore/Program.cs

@@ -24,7 +24,7 @@ namespace PhoneStore
             {
                 var userManager = services.GetRequiredService<UserManager<User>>();
                 RoleManager<Role> rolesManager = services.GetRequiredService<RoleManager<Role>>();
-                await AdminInitializer.SeedAdminUser(rolesManager, userManager);
+                await AdminInitializerService.SeedAdminUser(rolesManager, userManager);
             }
             catch (Exception ex)
             {

PhoneStore/Services/Abstractions/IAccountService.cs

@@ -8,6 +8,6 @@ namespace PhoneStore.Services.Abstractions
     {
         Task<IdentityResult> Register(RegisterViewModel model);
         Task<IdentityResult> LogIn(LoginViewModel model);
-        Task<IdentityResult> LogOf();
+        Task LogOf();
     }
 }
\ No newline at end of file

PhoneStore/Services/AccountService.cs

 using System.Collections.Generic;
 using System.Linq;
-using System.Security.Policy;
 using System.Threading.Tasks;
 using Microsoft.AspNetCore.Identity;
 using PhoneStore.Enums;
@@ -73,9 +72,7 @@ namespace PhoneStore.Services
             };
         }
 
-        public Task<IdentityResult> LogOf()
-        {
-            throw new System.NotImplementedException();
-        }
+        public async Task LogOf() 
+            => await _signInManager.SignOutAsync();
     }
 }
\ No newline at end of file

PhoneStore/Services/AdminInitializer.cs → PhoneStore/Services/AdminInitializerService.cs

@@ -4,7 +4,7 @@ using PhoneStore.Models;
 
 namespace PhoneStore.Services
 {
-    public class AdminInitializer
+    public class AdminInitializerService
     {
         public static async Task SeedAdminUser(
             RoleManager<Role> roleManager,

PhoneStore/Startup.cs

@@ -50,7 +50,7 @@ namespace PhoneStore
             app.UseStaticFiles();
 
             app.UseRouting();
-            
+            app.UseAuthorization().UseAuthentication();
             app.UseEndpoints(endpoints =>
             {
                 endpoints.MapControllerRoute(

PhoneStore/Views/Shared/_Layout.cshtml

@@ -29,6 +29,21 @@
                     </li>
                 </ul>
             </div>
+            <div class="login_group">
+                @if(User.Identity.IsAuthenticated)
+                {
+                    <p>@User.Identity.Name</p>
+                           
+                    <form method="post" asp-controller="Account" asp-action="LogOff">
+                        <input type="submit" value="Выход" />
+                    </form>
+                }
+                else
+                {
+                    <a asp-controller="Account" asp-action="Login">Вход</a>
+                    <a asp-controller="Account" asp-action="Register">Регистрация</a>
+                }
+            </div>
         </div>
     </nav>
 </header>

PhoneStore/appsettings.json

 {
   "ConnectionStrings": {
-    "DefaultConnection": "Server=localhost;Port=54320;database=lesson55;Username=postgres;Password=postgres;"
+    "DefaultConnection": "Server=localhost;Port=54320;database=lesson58;Username=postgres;Password=postgres;"
   },
   "Logging": {
     "LogLevel": {