Error:

An unhandled exception occurred while processing the request. InvalidOperationException: Unable to resolve service for type 'Microsoft.AspNetCore.Identity.UserManager`1[Microsoft.AspNetCore.Identity.IdentityUser]' while attempting to activate 'TestApp_03_RazorPage_Identity.Areas.Identity.Pages.Account.RegisterModel'. Microsoft.Extensions.DependencyInjection.ActivatorUtilities.GetService(IServiceProvider sp, Type type, Type requiredBy, bool isDefaultParameterRequired)

detail: I am following microsoft example, still it is not working when i try to set up a ApplicationUser class. I seen similar post and nothing is working for me

Program.cs

var builder = WebApplication.CreateBuilder(args);
var connectionString = 
builder.Configuration.GetConnectionString("MyConnection");
builder.Services.AddDbContext<ApplicationDbContext>(options =>
        options.UseSqlServer(connectionString));

builder.Services.AddDatabaseDeveloperPageExceptionFilter();

builder.Services.AddIdentity<ApplicationUser, IdentityRole>()
        .AddEntityFrameworkStores<ApplicationDbContext>();

builder.Services.AddRazorPages();

ApplicationUser.cs

public class ApplicationUser : IdentityUser
{
    public string FullName { get; set; }
}

ApplicationDbContext.cs

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

_LoginPartial.cshtml

@using Microsoft.AspNetCore.Identity
@inject SignInManager<ApplicationUser> SignInManager
@inject UserManager<ApplicationUser> UserManager

RegisterModel

public class RegisterModel : PageModel
{
    private readonly SignInManager<ApplicationUser> _signInManager;
    private readonly UserManager<ApplicationUser> _userManager;
    private readonly IUserStore<IdentityUser> _userStore;
    private readonly IUserEmailStore<IdentityUser> _emailStore;
    private readonly ILogger<RegisterModel> _logger;
    private readonly IEmailSender _emailSender;

CodePudding user response：

If you extends IdentityUser, you need to use ApplicationUser:

private readonly IUserStore<ApplicationUser> _userStore;
private readonly IUserEmailStore<ApplicationUser> _emailStore;

instead of:

private readonly IUserStore<IdentityUser> _userStore;
private readonly IUserEmailStore<IdentityUser> _emailStore;