UserManager "A second operation started on this context" 错误仅在使用断点调试时

如何解决UserManager "A second operation started on this context" 错误仅在使用断点调试时

这让我把头发拔了。任何帮助都将不胜感激。

我正在 .NET 框架 4.6.1 中运行一个 MVC（我相信是 5 个）应用程序。我正在使用身份验证。大约一年前，我在旧电脑上创建了这个网站。在过去的一年里，我断断续续地研究它，从来没有遇到过这个问题。然后最近，我买了一台新笔记本电脑，从 GitHub 克隆了这个项目，突然间我遇到了这个奇怪的问题，每当我调试和单步执行调用它的某个地方时，UserManager 都会给我这个“第二次操作”错误，这我的网站上有很多地方。它从未在我的旧机器上对我这样做过，所以我不知道是不是需要更改设置，或者我是否偶然遗漏了旧机器上的一些代码，尽管这似乎不太可能。

我以默认方式设置了我的 UserManager，将其创建为 OwinContext 的一部分。

public class ApplicationUserManager : UserManager<ApplicationUser>
    {
        public ApplicationUserManager(IUserStore<ApplicationUser> store)
            : base(store)
        {
        }

    public static ApplicationUserManager Create(IdentityFactoryOptions<ApplicationUserManager> options,IOwinContext context) 
    {
        var manager = new ApplicationUserManager(new UserStore<ApplicationUser>(context.Get<AppUsersDbContext>()));
        // Configure validation logic for usernames
        manager.UserValidator = new UserValidator<ApplicationUser>(manager)
        {
            AllowOnlyAlphanumericUserNames = false,RequireUniqueEmail = true
        };

        // Configure validation logic for passwords
        manager.PasswordValidator = new PasswordValidator
        {
            requiredLength = 6,RequireNonLetterOrDigit = true,requiredigit = true,RequireLowercase = true,RequireUppercase = true,};

        // Configure user lockout defaults
        manager.UserLockoutEnabledByDefault = true;
        manager.DefaultAccountLockoutTimeSpan = TimeSpan.FromMinutes(5);
        manager.MaxFailedAccessAttemptsBeforeLockout = 5;

        // Register two factor authentication providers. This application uses Phone and Emails as a step of receiving a code for verifying the user
        // You can write your own provider and plug it in here.
        manager.RegisterTwoFactorProvider("Phone Code",new PhoneNumberTokenProvider<ApplicationUser>
        {
            messageformat = "Your security code is {0}"
        });
        manager.RegisterTwoFactorProvider("Email Code",new EmailTokenProvider<ApplicationUser>
        {
            Subject = "Security Code",BodyFormat = "Your security code is {0}"
        });
        manager.EmailService = new EmailService();
        manager.SmsService = new SmsService();
        var dataProtectionProvider = options.DataProtectionProvider;
        if (dataProtectionProvider != null)
        {
            manager.UserTokenProvider = 
                new DataProtectorTokenProvider<ApplicationUser>(dataProtectionProvider.Create("ASP.NET Identity"));
        }
        return manager;
    }
}



public partial class Startup
    {
        
        public void ConfigureAuth(IAppBuilder app)
        {
            // Configure the db context,user manager and signin manager to use a single instance per request
            app.CreatePerOwinContext(AppUsersDbContext.Create);
            app.CreatePerOwinContext<ApplicationUserManager>(ApplicationUserManager.Create);
            app.CreatePerOwinContext<ApplicationRoleManager>(ApplicationRoleManager.Create);
            app.CreatePerOwinContext<ApplicationSignInManager>(ApplicationSignInManager.Create);

            // Enable the application to use a cookie to store information for the signed in user
            // and to use a cookie to temporarily store information about a user logging in with a third party login provider
            // Configure the sign in cookie
            app.UseCookieAuthentication(new CookieAuthenticationoptions
            {
                AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,LoginPath = new PathString("/Account/Login"),Provider = new CookieAuthenticationProvider
                {
                    // Enables the application to validate the security stamp when the user logs in.
                    // This is a security feature which is used when you change a password or add an external login to your account.  
                    OnValidateIdentity = SecurityStampValidator.OnValidateIdentity<ApplicationUserManager,ApplicationUser>(
                        validateInterval: TimeSpan.FromMinutes(30),regenerateIdentity: (manager,user) => user.GenerateUserIdentityAsync(manager))
                }
            });            
            app.UseExternalSignInCookie(DefaultAuthenticationTypes.ExternalCookie);

            // Enables the application to temporarily store user information when they are verifying the second factor in the two-factor authentication process.
            app.UseTwoFactorSignInCookie(DefaultAuthenticationTypes.TwoFactorCookie,TimeSpan.FromMinutes(5));

            // Enables the application to remember the second login verification factor such as phone or email.
            // Once you check this option,your second step of verification during the login process will be remembered on the device where you logged in from.
            // This is similar to the RememberMe option when you log in.
            app.UseTwoFactorRememberbrowserCookie(DefaultAuthenticationTypes.TwoFactorRememberbrowserCookie);

            // Uncomment the following lines to enable logging in with third party login providers
            //app.UseMicrosoftAccountAuthentication(
            //    clientId: "",//    clientSecret: "");

            //app.UseTwitterauthentication(
            //   consumerKey: "",//   consumerSecret: "");

            //app.UseFacebookAuthentication(
            //   appId: "",//   appSecret: "");

            //app.UseGoogleAuthentication(new GoogleOAuth2Authenticationoptions()
            //{
            //    ClientId = "",//    ClientSecret = ""
            //});
        }
    }

如您所见，这一切都非常标准，至少就我所知。我什至认为自 Visual Studio 创建此代码以来，我从未对它进行过任何重大修改。

当它被调用时，概念是我的父控制器有一个 AppUser 属性，以便我可以获得有关当前用户的任何信息，我需要进行数据存储调用。为了获得这个 AppUser，我调用了 UserManager 和 FindByName。

public ApplicationUser AppUser
        {
            get
            {
                if (appUser == null) { appUser = UserManager.FindByName(User.Identity.Name); }
                return appUser;
            }
        }

        public ApplicationUserManager UserManager
        {
            get
            {
                return _userManager ?? HttpContext.GetowinContext().GetUserManager<ApplicationUserManager>();
            }
            set
            {
                _userManager = value;
            }
        }

然后我在如下示例中调用该 AppUser：

[HttpPost]
        [HasAccess(Priviledge = AppLogic.Priviledge.DM)]
        public JsonResult Updateactivitylog(activitylogPostModel model)
        {
            try
            {
                CampaignSvc.Updateactivitylog(AppUser.UserId,AppUser.ActiveCampaign.Value,model.ArcKey,model.LogKey,model.LogDescription,model.Type,model.ContentKey);
            }
            catch (Exception ex)
            {
                return Json(new { success = false,message = ex.Message });
            }

            return Json(new { success = true,message = "Log added successfully!" });
        }

上面的例子只是众多例子中的一个。这与这个特定实例无关。我几乎可以选择站点中的任何地方。所以让我出现这个“第二个操作”错误的一件事是我什至没有调用调用的异步版本。可以说我应该，但我不是，但我仍然收到这个错误。因此，最重要的是，在使用 localhost 在调试模式下运行站点时，我没有收到此错误。我可以在网站上执行任何我需要的操作，而且我没有遇到任何问题。但是在随机时间，如果我在调试和单步执行时有一个断点，我的操作就会失败并且我会收到这个“第二次操作”异常，这在我的旧计算机上从未发生过一次。我可以停止实例并重新启动它，它会立即给我这个错误，就像即使 IIS Express 没有在任务栏中运行，它仍然保留旧实例。通常，我通过重新启动实例几次或休息 10 分钟然后重新启动来使其停止。但可以肯定的是，如果我通过调用该调用的断点进行调试，错误又会回来。

有什么想法或笨蛋给我吗？