在过去3天里尝试解决该问题后，因此，我寻求您的帮助。我已经从stackoverflow讨论了许多相关的问题，除了它们是不同的.Net Core版本。

我最近将网站从ASP.NET CORE 2.2升级到ASP.NET CORE 3.0，但是现在我在该网站上继续收到HTTP Error 502.5 - Process Failure。您可以在http://www.esnapup.com上看到该页面。

这是Startup.cs的样子：

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.AddAuthentication(IISServerDefaults.AuthenticationScheme);
        services.AddDbContext<AppDbContext>();
        services.AddTransient<IProductRepository,ProductRepository>();
        services.AddTransient<ICategoryRepository,CategoryRepository>();
        services.AddTransient<IFeedRepository,FeedRepository>();
        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.AddDistributedMemoryCache();

        services.AddSession(options =>
        {
            // Set a short timeout for easy testing.
            options.IdleTimeout = TimeSpan.FromSeconds(10);
            options.Cookie.HttpOnly = true;
            // Make the session cookie essential
            options.Cookie.IsEssential = true;

        });
        MvcOptions mvcOptions = new MvcOptions();
        mvcOptions.EnableEndpointRouting = false;
        services.AddMvc();
        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.EnvironmentName == "Development")
        {
            app.UseDeveloperExceptionPage();
            app.UseStatusCodePages();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            //app.UseExceptionHandler("/Raffaello/Index");
            // 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.UseSession();
        //app.UseCookiePolicy();
        app.UseRouting();
        app.UseAuthentication();
        app.UseEndpoints(routes =>
        {
            routes.MapControllerRoute(
            name: "Details",pattern: "{controller}/{Details}/{id?}",new { controller = "Product",action = "Details" },new { id = @"w+" });
            routes.MapControllerRoute(
             name: "Detail",pattern: "{controller}/{index}/{Detail}/{id?}",action = "Detail",level = "index" },new { id = @"w+" });
            routes.MapControllerRoute(
              name: "default",pattern: "{controller=Home}/{action=Index}/{id?}");
            routes.MapRazorPages();

        });
        //app.UseSitemapMiddleware();
    }

Program.cs页面如下：

using microsoft.AspNetCore.Hosting;
using microsoft.Extensions.Hosting;

namespace snapupMVC
   {
public class Program
{
    public static void Main(string[] args)
    {
        CreateHostBuilder(args).Build().Run();
    }

    public static IHostBuilder CreateHostBuilder(string[] args) =>
Host.CreateDefaultBuilder(args)
    .ConfigureWebHostDefaults(webBuilder =>
    {
        webBuilder.UseSetting(
                WebHostDefaults.PreventHostingStartupKey,"true")
            .UseStartup<Startup>();
    });
}
}

这是我的.csproj代码：

   <?xml version="1.0" encoding="utf-8"?>
   <Project ToolsVersion="Current" 
     xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
    <PropertyGroup>

600     真正     假     假     MvcControllerEmptyScaffolder     根/控制器     1440     假     CustomProfile          真正   

请帮助我解决问题。

谢谢