在.net core 2.2应用程序上刷新F5浏览器后尝试访问User.Identity.Name时发生ObjectDisposedException

Question

我有一个具有Windows身份验证的.net核心2.2 mvc应用程序，并且已将自定义HttpContext设置为中间件。在我的家庭控制器中，我想获取当前用户的各种详细信息。当应用程序加载时，所有功能都可以按预期工作，但是如果刷新浏览器，它将在

行上失败

string UserIdentityName = MyHttpContext.Current.User.Identity.Name;

，出现错误“ System.ObjectDisposedException：安全句柄已关闭”-TargetSite {Void DangerousAddRef（Boolean ByRef）}

请帮助。

HttpContextMiddleware.cs：

using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Http;
using Microsoft.Extensions.DependencyInjection;

public class MyHttpContext
{
    private static IHttpContextAccessor m_httpContextAccessor;

    public static HttpContext Current => m_httpContextAccessor.HttpContext;

    public static string AppBaseUrl => $"{Current.Request.Scheme}://{Current.Request.Host}{Current.Request.PathBase}";

    internal static void Configure(IHttpContextAccessor contextAccessor)
    {
        m_httpContextAccessor = contextAccessor;
    }
}

public static class HttpContextExtensions
{
    public static void AddHttpContextAccessor(this IServiceCollection services)
    {
        services.AddSingleton<IHttpContextAccessor, HttpContextAccessor>();
    }

    public static IApplicationBuilder UseHttpContext(this IApplicationBuilder app)
    {
        MyHttpContext.Configure(app.ApplicationServices.GetRequiredService<IHttpContextAccessor>());
        return app;
    }
}

StartUp.cs：

using CoreIV_Admin_Core.Helpers;
using Microsoft.AspNetCore.Builder;
using Microsoft.AspNetCore.Hosting;
using Microsoft.AspNetCore.Http;
using Microsoft.AspNetCore.Mvc;
using Microsoft.AspNetCore.Server.IISIntegration;
using Microsoft.AspNetCore.SpaServices.Webpack;
using Microsoft.Extensions.Configuration;
using Microsoft.Extensions.DependencyInjection;
using Microsoft.Extensions.DependencyInjection.Extensions;
using NLog;

namespace CoreIV_Admin_Core
{
    public class Startup
    {
        public Startup(IConfiguration configuration)
        {
            Configuration = configuration;
        }

        public static IConfiguration Configuration
        {
            get; set;
        }

        // This method gets called by the runtime. Use this method to add services to the container.
        public void ConfigureServices(IServiceCollection services)
        {
            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.TryAddSingleton<IHttpContextAccessor, HttpContextAccessor>();

            services.Configure<AppConfig>(options => Configuration.GetSection("AppConfig").Bind(options));

            services.AddAuthentication(IISDefaults.AuthenticationScheme);

            services.AddMvc()
                .SetCompatibilityVersion(CompatibilityVersion.Version_2_2);

            //services.AddHttpContextAccessor();
        }

        // This method gets called by the runtime. Use this method to configure the HTTP request pipeline.
        public void Configure(IApplicationBuilder app, IHostingEnvironment env)
        {
            if (env.IsDevelopment())
            {
                app.UseDeveloperExceptionPage();
                app.UseWebpackDevMiddleware(new WebpackDevMiddlewareOptions
                {
                    HotModuleReplacement = true
                });
            }
            else
            {
                app.UseExceptionHandler("/Home/Error");
                app.UseHsts();
            }

            LogManager.Configuration.Variables["logdir"] = Configuration["AppConfig:logDirectory"];

            app.UseHttpsRedirection();

            app.UseStaticFiles();

            app.UseCookiePolicy();

            app.UseHttpContext();

            app.UseAuthentication();

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

                routes.MapSpaFallbackRoute(
                    name: "spa-fallback",
                    defaults: new
                    {
                        controller = "Home",
                        action = "Index"
                    });
            });
        }
    }
}