ASP.NET Core 2.1 会话

在ASP.NET Core 2.1中，我无法访问会话变量。

在调试过程中，我注意到每个请求中会话ID都会发生变化（HttpContex.Session.Id）。

我在会话配置中犯了错误吗？

Startup.cs

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(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.AddMvc().SetCompatibilityVersion(CompatibilityVersion.Version_2_1);
        
        // Adds a default in-memory implementation of IDistributedCache.
        services.AddDistributedMemoryCache();
        
        services.AddSession(options =>
        {
            // Set a short timeout for easy testing.
            options.IdleTimeout = TimeSpan.FromSeconds(1000);
            options.Cookie.HttpOnly = true;
        });
    }
    
    // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
    public void Configure(IApplicationBuilder app, IHostingEnvironment env)
    {
        app.UseSession();
        
        if (env.IsDevelopment())
        {
            app.UseBrowserLink();
            app.UseDeveloperExceptionPage();
        }
        else
        {
            app.UseExceptionHandler("/Home/Error");
            app.UseHsts();
        }
        
        app.UseHttpsRedirection();
        app.UseStaticFiles();
        app.UseCookiePolicy();
        
        app.UseMvc(routes =>
        {
            routes.MapRoute(
                name: "default",
                template: "{controller=Home}/{action=Index}/{id?}");
        });
    }
}

Program.cs

public class Program
{
    public static void Main(string[] args)
    {
        CreateWebHostBuilder(args).Build().Run();
    }
    
    public static IWebHostBuilder CreateWebHostBuilder(string[] args) =>
        WebHost.CreateDefaultBuilder(args)
            .UseStartup();
}

在调试过程中，我注意到每个请求的会话ID都会发生变化（HttpContex.Session.Id）。

using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using ucms6.Models;
namespace ucms6.Controllers
{
    public class HomeController : Controller
    {
        const string SessionKeyName = "_Name";
        const string SessionKeyYearsMember = "_YearsMember";
        const string SessionKeyDate = "_Date";
        
        public IActionResult Index()
        {
            // Requires using Microsoft.AspNetCore.Http;
            HttpContext.Session.SetString(SessionKeyName, "Rick");
            HttpContext.Session.SetInt32(SessionKeyYearsMember, 3);
            return RedirectToAction("SessionNameYears");
        }
        
        public IActionResult SessionNameYears()
        {
            var name = HttpContext.Session.GetString(SessionKeyName);
            var yearsMember = HttpContext.Session.GetInt32(SessionKeyYearsMember);
            return Content($"Name: \"{name}\",  Membership years: \"{yearsMember}\"");
        }
        
        public IActionResult About()
        {
            ViewData["Message"] = "Your application description page.";
            return View();
        }
    }
}