Disable Session state per-request in ASP.Net MVC

user_70613 0
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I am creating an ActionResult in ASP.Net MVC to serve images. With Session state enabled, IIS will only handle one request at a time from the same user. (This is true not just in MVC.)

Therefore, on a page with multiple images calling back to this Action, only one image request can be handled at a time. It's synchronous.

I'd like this image Action to be asynchronous -- I'd like multiple image requests to each execute without needing the previous one to complete. (If the images were just static files, IIS would serve them up this way.)

So, I'd like to disable Session just for calls to that Action, or to specify that certain requests do not have Session state. Anyone know how this is done in MVC? Thanks!

actionresult session-state asynchronous asp.net-mvc asp.net
9 Answers

I would to share my solution for disable ASP.NET Session for an specific request (in my case, a WCF Service) using an HttpModule:

public class AspNetSessionFilterModule : IHttpModule
{
    public void Init(HttpApplication context)
    {
        context.PostMapRequestHandler += OnPostMapRequestHandler;
    }

    private void OnPostMapRequestHandler(object sender, EventArgs e)
    {
        var context = (sender as HttpApplication).Context;
        DisableSessionForSomeRequests(context);
    }

    private void DisableSessionForSomeRequests(HttpContext context)
    {
        if ("~/Services/MyService.svc".Equals(context.Request.AppRelativeCurrentExecutionFilePath, StringComparison.InvariantCultureIgnoreCase))
        {
            context.SetSessionStateBehavior(System.Web.SessionState.SessionStateBehavior.Disabled);
        }
    }

    public void Dispose()
    { }
}
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