There is no registered service of type

Question

I am trying to make a new version of AuthenticationStateProvider so that I can use the data already in my db. I called it ServerAuthenticationStateProvider:

using Microsoft.AspNetCore.Components;
using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq;
using System.Security.Claims;
using System.Threading.Tasks;

namespace BadgerWatchWeb.Services
{
    public class ServerAuthenticationStateProvider :    AuthenticationStateProvider
{
    string UserId;
    string Password;
    bool IsAuthenticated = false;

    public void LoadUser(string _UserId, string _Password)
    {
        UserId = _UserId;
        Password = _Password;
    }

    public async Task LoadUserData()
    {
        var securityService = new SharedServiceLogic.Security();
        try
        {
            var passwordCheck = await securityService.ValidatePassword(UserId, Password);
            IsAuthenticated = passwordCheck == true ? true : false;
        } catch(Exception ex)
        {
            Console.WriteLine(ex);
        }


    }

    public override async Task<AuthenticationState> GetAuthenticationStateAsync()
    {
        var userService = new UserService();

        var identity = IsAuthenticated
            ? new ClaimsIdentity(await userService.GetClaims(UserId))
            : new ClaimsIdentity();

        var result = new AuthenticationState(new ClaimsPrincipal(identity));
        return result;
    }

}

}

My configure services looks like:

        public void ConfigureServices(IServiceCollection services)
    {
        services.AddRazorPages();
        services.AddServerSideBlazor();
        services.AddSingleton<UserService>();
        services.AddScoped<AuthenticationStateProvider, ServerAuthenticationStateProvider>();
        services.AddAuthorizationCore();
    }

I then inject @inject ServerAuthenticationStateProvider AuthenticationStateProvider into my razor view file.

When I run the code I get InvalidOperationException: Cannot provide a value for property 'AuthenticationStateProvider' on type 'BadgerWatchWeb.Pages.Index'. There is no registered service of type 'BadgerWatchWeb.Services.ServerAuthenticationStateProvider'.

Answer 1

You should replace

@inject ServerAuthenticationStateProvider AuthenticationStateProvider

with

@inject AuthenticationStateProvider AuthenticationStateProvider

because that is how you registered it.