只能在引发“HttpApplication.AcquireRequestState”之前调用“HttpContext.SetSessionStateBehavior”

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string originalPath = Request.Path;

// MVC3+ running on IIS 7+
if (HttpRuntime.UsingIntegratedPipeline)
{
HttpContext.Current.Server.TransferRequest(Request.ApplicationPath, true);
HttpContext.Current.RewritePath(originalPath, false);
}
else
{
// Pre MVC 3
HttpContext.Current.RewritePath(Request.ApplicationPath, false);
IHttpHandler httpHandler = new MvcHttpHandler();
httpHandler.ProcessRequest(HttpContext.Current); //mvc3++之前

HttpContext.Current.RewritePath(originalPath, false);
}

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