切换到 .net core 3 端点路由后，身份 UI 不再工作

在很难让我的区域显示端点路由之后，我设法在这个自我回答的线程中修复它（尽管不是以非常令人满意的方式）：从 2.2 迁移到 3.0 后出现问题，默认工作但无法访问区域，是否有办法调试端点分辨率？ https://stackoverflow.com/questions/58250609/issue-after-migrating-from-2-2-to-3-0-default-works-but-cant-access-area-is-t

然而，身份用户界面根本不显示给我，我在挑战时被重定向到正确的网址，但页面是空白的。我添加了身份 UI 块包，并且从 mvc 路由更改为端点路由，我没有更改任何可能会破坏它的内容。

我似乎也没有做太多不同于默认项目的事情，即使我像我在黑客中所做的那样添加一条路线，身份也在那里工作。

由于问题经常隐藏在线路周围而不是线路上，所以我发布了整个启动文件。

常规（默认）控制器可以工作。 管理区域有效（其中一个页面没有身份验证，我可以访问它） 任何其他管理区域页面将我重定向到 /Identity/Account/Login?ReturnUrl=%2Fback （预期行为），但该页面以及我测试的任何其他 /Identity 页面在调试中运行并附加调试器时都是空白，没有错误。

非常感谢任何帮助，完整启动如下：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Identity;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.HttpsPolicy;
using Microsoft.AspNetCore.Mvc;
using Microsoft.EntityFrameworkCore;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using FranceMontgolfieres.Models;
using Microsoft.AspNetCore.Mvc.Infrastructure;
using Microsoft.Extensions.Hosting;
using Microsoft.AspNetCore.Diagnostics.HealthChecks;

namespace FranceMontgolfieres
{
    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.AddSingleton<IConfiguration>(Configuration);

            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
                .AddDbContext<FMContext>(options => options
                    .UseLazyLoadingProxies(true)
                    .UseSqlServer(Configuration.GetConnectionString("DefaultConnection")));

            services
                .AddDefaultIdentity<IdentityUser>()
                .AddRoles<IdentityRole>()
                .AddEntityFrameworkStores<FMContext>();

            services
                .AddMemoryCache();

            services.AddDistributedSqlServerCache(options =>
            {
                options.ConnectionString = Configuration.GetConnectionString("SessionConnection");
                options.SchemaName = "dbo";
                options.TableName = "SessionCache";
            });

            services.AddHttpContextAccessor();

            services
                .AddSession(options => options.IdleTimeout = TimeSpan.FromMinutes(30));

            services.AddControllersWithViews();
            services.AddRazorPages();
        }

        // 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();
                app.UseDatabaseErrorPage();
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                // The default HSTS value is 30 days. You may want to change this for production scenarios, see https://aka.ms/aspnetcore-hsts.
                app.UseHsts();
            }

            app.UseHttpsRedirection();
            app.UseRouting();
            app.UseStaticFiles();
            app.UseCookiePolicy();
            app.UseAuthentication();
            app.UseAuthorization();
            app.UseSession(); 

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapAreaControllerRoute("Back", "Back", "back/{controller=Home}/{action=Index}/{id?}");
                endpoints.MapControllerRoute("default","{controller=Home}/{action=Index}/{id?}");
            });
        }

        private async Task CreateRoles(IServiceProvider serviceProvider)
        {
            //initializing custom roles 
            var RoleManager = serviceProvider.GetRequiredService<RoleManager<IdentityRole>>();
            string[] roleNames = { "Admin", "Manager", "Member" };
            IdentityResult roleResult;

            foreach (var roleName in roleNames)
            {
                roleResult = await RoleManager.CreateAsync(new IdentityRole(roleName));
            }
        }
    }
}

身份 UI 是使用 Razor Pages 实现的。对于端点路由来映射这些，添加一个调用MapRazorPages在你的UseEndpoints打回来：

app.UseEndpoints(endpoints =>
{
    // ...
    endpoints.MapRazorPages();
});