如何在asp.net核心2.2.0版本中创建对象值的会话？

public void ConfigureServices(IServiceCollection services)
{
    services.AddSession(options =>
    {
        options.IdleTimeout = TimeSpan.FromMinutes(30);
        options.Cookie.HttpOnly = true;
        options.Cookie.IsEssential = true;
    });

    services.AddMvc();
}

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.UseSession(); // 添加会话中间件

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

public class HomeController : Controller
{
    public IActionResult Index()
    {
        // 设置会话值
        HttpContext.Session.SetString("UserName", "JohnDoe");

        // 读取会话值
        var userName = HttpContext.Session.GetString("UserName");

        return View();
    }
}

public class User
{
    public string Name { get; set; }
    public int Age { get; set; }
}

public class HomeController : Controller
{
    public IActionResult Index()
    {
        var user = new User { Name = "JohnDoe", Age = 30 };

        // 序列化对象并存储到会话
        HttpContext.Session.SetString("User", JsonConvert.SerializeObject(user));

        // 从会话中读取并反序列化对象
        var userJson = HttpContext.Session.GetString("User");
        var userObj = JsonConvert.DeserializeObject<User>(userJson);

        return View();
    }
}