Model view controller 从MVC2升级到MVC3会导致异常。见说明

我看了很多文章，寻找可能的重复，但没有成功地正确实现它们。我得到的例外是：

“HttpContext.SetSessionStateBehavior”只能在引发“HttpApplication.AcquisiteRequestState”事件之前调用

这是我的代码：

public void Page_Load(object sender, System.EventArgs e)
{
    string originalPath = Request.Path;
    HttpContext.Current.RewritePath(Request.ApplicationPath, false);
    IHttpHandler httpHandler = new MvcHttpHandler();
    httpHandler.ProcessRequest(HttpContext.Current);
    HttpContext.Current.RewritePath(originalPath, false);
}

修正了它：

public void Page_Load(object sender, System.EventArgs e)
{
    string originalPath = Request.Path;
    HttpContext.Current.RewritePath(Request.ApplicationPath, false);
    IHttpHandler httpHandler = new MvcHttpHandler();
    HttpContext.Current.Server.TransferRequest(Request.ApplicationPath);
    HttpContext.Current.RewritePath(originalPath, false);
}