类型或名称空间名称“ AzureAD”在名称空间“ Microsoft.AspNetCore.Authentication”中不存在

Question

I have an issue after following an example project from the following link https://azure.microsoft.com/en-gb/resources/samples/active-directory-aspnetcore-webapp-openidconnect-v2/ . It doesn't build at all and complains of the following 2 errors,

i) error CS0234: The type or namespace name 'AzureAD' does not exist in the namespace 'Microsoft.AspNetCore.Authentication' (are you missing an assembly reference?)

ii) error CS0234: The type or namespace name 'HttpsPolicy' does not exist in the namespace 'Microsoft.AspNetCore' (are you missing an assembly reference?) 1>Done building project "WebApp-OpenIDConnect-DotNet.csproj" -- FAILED.

I have followed some suggestions from elsewhere, which involved running "dotnet restore" on the project, but this hasn't worked.

Have any idea on what I need to do here?

---

File in question is below. This is "Startup.cs" taken from https://azure.microsoft.com/en-gb/resources/samples/active-directory-aspnetcore-webapp-openidconnect-v2/ .

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Authentication;
using Microsoft.AspNetCore.Authentication.AzureAD.UI;
using Microsoft.AspNetCore.Authorization;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Mvc.Authorization;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;

namespace active_directory_aspnetcore_webapp_openidconnect_v2_master
{
    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.Configure<CookiePolicyOptions>(options =>
            {
                // This lambda determines whether user consent for non-essential cookies is needed for a given request.
                options.CheckConsentNeeded = context => true;
                options.MinimumSameSitePolicy = SameSiteMode.None;
            });

            services.AddAuthentication(AzureADDefaults.AuthenticationScheme)
                .AddAzureAD(options => Configuration.Bind("AzureAd", options));

            services.AddMvc(options =>
            {
                var policy = new AuthorizationPolicyBuilder()
                    .RequireAuthenticatedUser()
                    .Build();
                options.Filters.Add(new AuthorizeFilter(policy));
            })
            .SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseStaticFiles();
            app.UseCookiePolicy();

            app.UseAuthentication();

            app.UseMvc(routes =>
            {
                routes.MapRoute(
                    name: "default",
                    template: "{controller=Home}/{action=Index}/{id?}");
            });
        }
    }
}

Answer 1

So it turned out the documentation was outdated and that the project required references to some of the missing libraries, which was easily done in the end. To resolve the issue I did the following,

i) Right click on "Dependencies" and click on "Manage NuGet packages...".
ii) Click on "Browse" and search for "Microsoft.AspNetCore.Authentication.AzureAD.UI" and install this library.
iii) Click on the "Installed" tab and update the existing libraries.

Rebuild your solution. It is also worth noting that the namespace value in both "HomeController.cs" and "AccountController.cs" should match each other. So for example they both should be "namespace WebApp_OpenIDConnect_DotNet.Controllers". There was a conflict with one of my files as it referenced "namespace active_directory_aspnetcore_webapp_openidconnect_v2_master.Controllers", which caused a compile error.

Answer 2

Install following packages with nuget:

install-package Microsoft.AspNetCore.DataProtection install-package Microsoft.AspNetCore.Antiforgery install-package Microsoft.AspNetCore.Authentication.Core install-package Microsoft.AspNetCore.Authentication.Cookies install-package Microsoft.AspNetCore.Authentication.JwtBearer install-package Microsoft.AspNetCore.Authentication.OAuth install-package Microsoft.AspNetCore.Authentication.OpenIdConnect install-package Microsoft.AspNetCore.Authentication install-package Microsoft.AspNetCore.Authorization.Policy install-package Microsoft.AspNetCore.Authorization install-package Microsoft.AspNetCore.Cors install-package Microsoft.AspNetCore.Diagnostics.Abstractions install-package Microsoft.AspNetCore.Html.Abstractions install-package Microsoft.AspNetCore.JsonPatch install-package Microsoft.AspNetCore.Localization install-package Microsoft.Extensions.Localization.Abstractions install-package Microsoft.AspNetCore.Localization install-package Microsoft.AspNetCore.Mvc.Abstractions install-package Microsoft.AspNetCore.Routing.Abstractions install-package Microsoft.AspNetCore.Mvc.Abstractions install-package Microsoft.AspNetCore.Mvc.Analyzers install-package Microsoft.AspNetCore.ResponseCaching.Abstractions install-package Microsoft.AspNetCore.Routing install-package Microsoft.Extensions.DependencyInjection install-package Microsoft.AspNetCore.Mvc.Core install-package Microsoft.AspNetCore.Mvc.ApiExplorer install-package Microsoft.AspNetCore.Mvc.Cors install-package Microsoft.Extensions.Localization install-package Microsoft.AspNetCore.Mvc.DataAnnotations install-package Microsoft.AspNetCore.Mvc.Formatters.Json install-package Microsoft.AspNetCore.Razor.Language install-package Microsoft.CodeAnalysis.Razor install-package Microsoft.AspNetCore.Mvc.Razor.Extensions install-package Microsoft.AspNetCore.Mvc.ViewFeatures install-package Microsoft.AspNetCore.Razor install-package Microsoft.AspNetCore.Razor.Runtime install-package Microsoft.Extensions.Caching.Abstractions install-package Microsoft.Extensions.Caching.Memory install-package Microsoft.Extensions.FileProviders.Composite install-package Microsoft.AspNetCore.Mvc.Razor install-package Microsoft.AspNetCore.Mvc.Localization install-package Microsoft.AspNetCore.Mvc.RazorPages install-package Microsoft.AspNetCore.Mvc.TagHelpers install-package Microsoft.AspNetCore.Razor.Design install-package Microsoft.AspNetCore.Mvc install-package Microsoft.AspNetCore.Authentication.AzureAD.UI

And optionally this: install-package Microsoft.NET.Sdk.Razor