如何在OWIN ASP.NET MVC5中注销用户

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，我遇到错误，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)

所以我无法得知会话结束时如何注销用户...

在 global.asax 中，我已经有了这个

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)
            {
            }
}

AccountController

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 具有

 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")
            });
}

答

为此，您需要定义一个ActionFilter属性，然后将用户重定向到相应的控制器操作.在那里，您需要检查会话值，如果它为null，则需要重定向用户.这是下面的代码(也您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"
                    }));

                }
            }

        }

    }
}

如何在OWIN ASP.NET MVC5中注销用户

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