Set session variable in Application_BeginRequest
Solution 1
Try AcquireRequestState in Global.asax. Session is available in this event which fires for each request:
void Application_AcquireRequestState(object sender, EventArgs e)
{
// Session is Available here
HttpContext context = HttpContext.Current;
context.Session["foo"] = "foo";
}
Valamas - Suggested Edit:
Used this with MVC 3 successfully and avoids session error.
protected void Application_AcquireRequestState(object sender, EventArgs e)
{
HttpContext context = HttpContext.Current;
if (context != null && context.Session != null)
{
context.Session["foo"] = "foo";
}
}
Solution 2
Maybe you could change the paradigm... Perhaps you can use another property of the HttpContext
class, more specifically HttpContext.Current.Items
as shown below:
protected void Application_BeginRequest(Object sender, EventArgs e)
{
HttpContext.Current.Items["__MySessionVariable"] = new object();
}
It won't store it on the session, but it will be stored on the Items dictionary of the HttpContext class and will be available for the duration of that specific request. Since you're setting it at every request, it would really make more sense to store it into a "per session" dictionary which, incidentally, is exactly what the Items is all about. :-)
Sorry to try to infer your requirements instead of answering your question directly, but I've faced this same problem before and noticed that what I needed was not the Session at all, but the Items property instead.
Solution 3
You can use the session items in Application_BeginRequest this way:
protected void Application_BeginRequest(object sender, EventArgs e)
{
//Note everything hardcoded, for simplicity!
HttpCookie cookie = HttpContext.Current.Request.Cookies.Get("LanguagePref");
if (cookie == null)
return;
string language = cookie["LanguagePref"];
if (language.Length<2)
return;
language = language.Substring(0, 2).ToLower();
HttpContext.Current.Items["__SessionLang"] = language;
Thread.CurrentThread.CurrentUICulture = CultureInfo.CreateSpecificCulture(language);
}
protected void Application_AcquireRequestState(object sender, EventArgs e)
{
HttpContext context = HttpContext.Current;
if (context != null && context.Session != null)
{
context.Session["Lang"] = HttpContext.Current.Items["__SessionLang"];
}
}
Daniel Peñalba
Software Engineer at Unity Technologies, Valladolid, Spain. Currently developing gmaster, Plastic SCM and SemanticMerge. Areas: C# GUI development Winforms and WPF expert ASP .NET Core Multiplatform UI development with Mono (Linux and OSX, GTK# and MonoMac) Eclipse plugin, Java Automated testing, NUnit, Moq, PNUnit and TestComplete Email: dpenalba[AT]codicesoftware[DOT]com I play the guitar at Sharon Bates, the greatest Spanish rock band.
Updated on July 09, 2022Comments
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Daniel Peñalba almost 2 years
I'm using ASP.NET MVC and I need to set a session variable at
Application_BeginRequest
. The problem is that at this point the objectHttpContext.Current.Session
is alwaysnull
.protected void Application_BeginRequest(Object sender, EventArgs e) { if (HttpContext.Current.Session != null) { //this code is never executed, current session is always null HttpContext.Current.Session.Add("__MySessionVariable", new object()); } }
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Elan Hasson about 12 yearsThis is exactly what I needed.
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Loudenvier over 11 yearsI think that in this case the Session is not the right property to use anyway. Try the context.Current.Items as I've shown in my answer. It won't be null since the start of the page life-cycle.
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Valamas almost 11 yearsI avoided the session issue in MVC3. I have edited the answer above with my suggestion.