How to share "System.Web.HttpContext.Current.Session" between ASP.NET and .NET CORE application

Question

Dear All,

I would like to share session values between ASP.NET and ASP.NET CORE application. It is working fine only when the session value is set inside "Session_Start() method in Global.asax.cs. When I try to set session value in an other action in an other controller of the ASP.NET application, the session value is NULL in the .NET CORE application.

What am I doing wrong?

program.cs:

// Creating listener:

builder.Services

*.AddSystemWebAdapters()*

*.AddJsonSessionSerializer(options =>*

*{*

    *options.RegisterKey("testvalueString");*

*})*

*.AddSessionSerializer(options =>*

*{*

   *options.ThrowOnUnknownSessionKey = true;*

*})*

*.AddRemoteAppClient(options =>*

*{*

    *options.RemoteAppUrl = new Uri("http://localhost:65020/teszt/ind/");//http://localhost:65020/teszt/ind/*

    *options.ApiKey = "4ffb49b3-2aa3-40b3-96ca-1b5331aab2dc";*

*})*

*.AddSessionClient();*

(...)

// Creating server:

Global.asax.cs, Application_Start() action:

(...)

SystemWebAdapterConfiguration

*.AddSystemWebAdapters(this)*

*.AddJsonSessionSerializer(options =>*

*{*

    *options.RegisterKey("testvalueString");*

    *options.RegisterKey("tesvalueDateTime");*

*})*

*.AddSessionSerializer(options =>*

*{*

    *options.ThrowOnUnknownSessionKey = true;*

*})*

*.AddRemoteAppServer(options =>*

*{        options.ApiKey = "4ffb49b3-2aa3-40b3-96ca-1b5331aab2dc";// "";*      

*})*

*.AddSessionServer();*

(...)

Settins session value

System.Web.HttpContext.Current.Session["testvalueString"] = "Test value";

Accepted Answer

Hi @Marján Zoltán

Please check the SystemWebAdapters package version and your project version. From this issue, it seems that if using SystemWebAdapters 1.3.0 and .Net 8, System.Web.HttpContext.Session might be null. You can check your application and package version and try to use the 1.2 version on .NET 6.

I also tried to use the SystemWebAdapters package to share the session, but all failed, not matter setting session in Session_Start or controller. I suggest you can also post this issue on SystemWebAdapters Forum, and let the SystemWebAdapters team member give some suggestion.

To share session between ASP.NET and .NET CORE application, there have a workaround to share session value via cookie, you can refer to it:

Code in ASP.NET Controller:

        public ActionResult Index()
        {
            var sessionValue = "JohnDoe";
            // Store a value in the session
            Session["UserName"] = "JohnDoe";
            // In a controller or action in the MVC app
            var cookie = new HttpCookie("SharedSession", sessionValue)
            {
                HttpOnly = true, // Secure it to prevent client-side JavaScript access
                Expires = DateTime.Now.AddMinutes(30), // Set expiration for the session
                Domain = "localhost" // Set to the shared domain for subdomains
            };
            Response.Cookies.Add(cookie);
            ViewBag.UserName = sessionValue;
            return View();
        }

In ASP.NET Core Application:

        public IActionResult Index()
        {
            var sharedSession = Request.Cookies["SharedSession"];
            if (sharedSession != null)
            {
                // Use the session value
                var sessionValue = sharedSession;
                ViewBag.UserName = sessionValue;
            } 
            return View();
        }

Note: In this workaround, the cookies should in the same domain. Refer to this article: Share authentication cookies among ASP.NET apps

Besides, you can also database or Redis to share data between ASP.NET and .NET CORE application.

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Best regards,

Dillion

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It is not possible.

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