如何在 Blazor B2C 应用程序启动期间禁用身份验证？

问题描述

我使用 B2C 登录创建了一个 ASP.NET 5 Blazor 服务器应用程序。以下是启动代码。当我运行应用程序时，我看到一个 B2C 登录页面出现。如何在启动过程中防止身份验证？我希望用户仅通过单击顶部菜单中的登录链接来登录。

    {
        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.
        // For more information on how to configure your application,visit https://go.microsoft.com/fwlink/?LinkID=398940
        public void ConfigureServices(IServiceCollection services)
        {
            services.AddAuthentication(OpenIdConnectDefaults.AuthenticationScheme)
                .AddMicrosoftIdentityWebApp(Configuration.GetSection("AzureAdB2C"));

            services.AddControllersWithViews()
                .AddMicrosoftIdentityUI();

            services.AddAuthorization(options =>
            {
                // By default,all incoming requests will be authorized according to the default policy
                options.FallbackPolicy = options.DefaultPolicy;
            });

            services.AddRazorPages();
            services.AddServerSideBlazor()
                .AddMicrosoftIdentityConsentHandler();

            services.AddSingleton<WeatherForecastService>();
        }

        // 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("/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.UseStaticFiles();

            app.UseRouting();

            app.UseAuthentication();
            app.UseAuthorization();

            app.UseEndpoints(endpoints =>
            {
                endpoints.MapControllers();
                endpoints.MapBlazorHub();
                endpoints.MapFallbackToPage("/_Host");
            });
        }
    }

解决方法

我测试了您的代码，看起来 options.FallbackPolicy = options.DefaultPolicy; 导致了自动重定向。将其注释掉并尝试一下，它应该可以工作。我还创建了一个 ASP .NET Core 5 Blazor Server 应用程序并测试了这段代码。在评论上面提到的那行之后，我确实得到了可供用户点击的登录按钮。

services.AddControllersWithViews()
                .AddMicrosoftIdentityUI();

            services.AddAuthorization(options =>
            {
                // By default,all incoming requests will be authorized according to the default policy
                //options.FallbackPolicy = options.DefaultPolicy;
            });