如何在 OWIN ASP.NET MVC5 中注销用户 [英] How to logout user in OWIN ASP.NET MVC5

问题描述

我有一个ASP.NET MVC5 项目的标准AccountController 类.当我尝试注销用户时，我面临一个错误，因为 HttpContext 是 null.(我的意思是这里 HttpContext.GetOwinContext().Authentication 为空)

I have got a standard AccountController class of ASP.NET MVC5 project. When I try to log out user I am facing an error coz HttpContext is null. (I mean here HttpContext.GetOwinContext().Authentication is null)

所以我不知道如何在会话结束时注销用户...

在global.asax我有这个

protected void Session_Start(object sender, EventArgs e)
{
     Session.Timeout = 3; 
}

protected void Session_End(object sender, EventArgs e)
{
            try
            {
                 var accountController = new AccountController();
                 accountController.SignOut();
            }
            catch (Exception)
            {
            }
}

账户控制器

public void SignOut()
{
      // Even if I do It does not help coz HttpContext is NULL
      _authnManager = HttpContext.GetOwinContext().Authentication;    

    AuthenticationManager.SignOut();


}

private IAuthenticationManager _authnManager;  // Add this private variable


public IAuthenticationManager AuthenticationManager // Modified this from private to public and add the setter
{
            get
            {
                if (_authnManager == null)
                    _authnManager = HttpContext.GetOwinContext().Authentication;
                return _authnManager;
            }
            set { _authnManager = value; }
}

Startup.Auth.cs 有

 public void ConfigureAuth(IAppBuilder app)
        {
            // Enable the application to use a cookie to store information for the signed in user
            app.UseCookieAuthentication(new CookieAuthenticationOptions
            {
                ExpireTimeSpan = TimeSpan.FromMinutes(3),
                AuthenticationType = DefaultAuthenticationTypes.ApplicationCookie,
                LoginPath = new PathString("/Account/Login")
            });
}

推荐答案

为此，您需要定义 ActionFilter 属性，并在那里将用户重定向到相应的控制器操作.在那里你需要检查会话值，如果它为空，那么你需要重定向用户.这是下面的代码(还有你可以访问我的博客了解详细步骤):

For this you need to define a ActionFilter attribute and there you need to redirect the user to the respective controller action. There you need to check for the session value and if its null then you need to redirect the user. Here is the code below( Also you can visit my blog for detail step):

public class CheckSessionOutAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(ActionExecutingContext filterContext)
        {
            string controllerName = filterContext.ActionDescriptor.ControllerDescriptor.ControllerName.ToLower().Trim();
            string actionName = filterContext.ActionDescriptor.ActionName.ToLower().Trim();

            if (!actionName.StartsWith("login") && !actionName.StartsWith("sessionlogoff"))
            {
                var session = HttpContext.Current.Session["SelectedSiteName"];
                HttpContext ctx = HttpContext.Current;
                //Redirects user to login screen if session has timed out
                if (session == null)
                {
                    base.OnActionExecuting(filterContext);


                    filterContext.Result = new RedirectToRouteResult(new RouteValueDictionary(new
                    {
                        controller = "Account",
                        action = "SessionLogOff"
                    }));

                }
            }

        }

    }
}

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