MVC Adding Roles Error

Im trying to add roles but i keep getting the same error:

my startup.cs:

using Mastervisualidentity.Models;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.Hosting;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.EntityFrameworkCore;
using Microsoft.EntityFrameworkCore.Design;
using Microsoft.AspNetCore.Identity;
namespace Mastervisualidentity
{
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.AddIdentity(options =>
{
options.User.RequireUniqueEmail = false;
options.Password.RequireDigit = false;
options.Password.RequiredLength = 3;
options.Password.RequireNonAlphanumeric = false;
options.Password.RequiredUniqueChars = 0;
options.Password.RequireLowercase = false;
options.Password.RequireUppercase = false;
}).AddEntityFrameworkStores()
.AddDefaultTokenProviders().AddRoles();
services.AddDbContext(options =>
options.UseSqlServer(Configuration.GetConnectionString("Master")));
services.AddControllersWithViews();
services.AddRazorPages();
services.ConfigureApplicationCookie(config =>
{
config.Cookie.Name = "Login_Cookie1";
config.LoginPath = "/Account/Login";
});
services.AddAuthorization(options =>
{
options.AddPolicy("RequireAdministrator",
policy => policy.RequireRole("Administrator"));
});
}
// 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");
app.UseHsts();
}
app.UseHttpsRedirection();
app.UseStaticFiles();
app.UseRouting();
app.UseAuthentication();
app.UseAuthorization();
app.UseEndpoints(endpoints =>
{
endpoints.MapControllerRoute(
name: "default",
pattern: "{controller=Account}/{action=Index}/{id?}");
});
}
}
}

the error I keep getting:

System.InvalidOperationException: Unable to resolve service for type 'Microsoft.AspNetCore.Identity.RoleManager`1[Microsoft.AspNetCore.Identity.IdentityRole]' while attempting to activate 'Mastervisualidentity.Controllers.AccountController'.
at Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, Boolean isDefaultParameterRequired)
at lambda_method2(Closure , IServiceProvider , Object[] )
at Microsoft.AspNetCore.Mvc.Controllers.ControllerActivatorProvider.<>c__DisplayClass4_0.b__0(ControllerContext controllerContext)
at Microsoft.AspNetCore.Mvc.Controllers.ControllerFactoryProvider.<>c__DisplayClass5_0.g__CreateController|0(ControllerContext controllerContext)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ControllerActionInvoker.InvokeInnerFilterAsync()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|24_0(ResourceInvoker invoker, Task lastTask, State next, Scope scope, Object state, Boolean isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Rethrow(ResourceExecutedContextSealed context)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.Next(State& next, Scope& scope, Object& state, Boolean& isCompleted)
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.InvokeFilterPipelineAsync()
--- End of stack trace from previous location ---
at Microsoft.AspNetCore.Mvc.Infrastructure.ResourceInvoker.g__Awaited|17_0(ResourceInvoker invoker, Task task, IDisposable scope)
at Microsoft.AspNetCore.Routing.EndpointMiddleware.g__AwaitRequestTask|6_0(Endpoint endpoint, Task requestTask, ILogger logger)
at Microsoft.AspNetCore.Authorization.AuthorizationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Authentication.AuthenticationMiddleware.Invoke(HttpContext context)
at Microsoft.AspNetCore.Diagnostics.DeveloperExceptionPageMiddleware.Invoke(HttpContext context)

4 Replies

Know the answer? Post it — somebody with the same question will find it here.

osyris zosar5y ago
Alright i have finally solved it
for anyone that has the same problem:

in _loginPartial.cshtml
change:
@inject SignInManager SignInManager
@inject UserManager UserManager
to:
@inject SignInManager</* your custom Identityuser */> SignInManager
@inject UserManager</* your custom Identityuser */> UserManager
+1
Asma Khalid5y ago
Look into this https://bit.ly/2DiFZAb

Mark answer as accepted if helpful

Thanks & Regards,
Asma Khalid

For More Visit: www.asmak9.com or www.bytezaar.com
+1
osyris zosar5y ago
Yes offcourse:
public class AccountController : Controller
    {
        private UserManager Usermgr { get; }
        private SignInManager SignInmgr { get; }

        private readonly IdentityAppContext _context;
        private readonly RoleManager _rolemanager;


        public AccountController(UserManager userManager,
            SignInManager signInManager, IdentityAppContext context,
            RoleManager roleManager)
        {
            _rolemanager = roleManager;
            Usermgr = userManager;
            SignInmgr = signInManager;
            _context = context;
        }
+1
Kiran Mohanty5y ago
Can you please post AccountController constructor code?

One observation. You have not registered AppUser in Startup.cs.
services.AddIdentity()
.AddEntityFrameworkStores();
+1