.net 会话状态已创建会话 ID，但无法保存它，因为响应已被应用程序刷新

Question

我的 global.asax 中有以下 Session_Start

string myBrowser = Utils.SafeUserAgent(Request);
foreach (string bannedbrowser in BrowserBan.BrowsersToBan)
{
   if (myBrowser.IndexOf(bannedbrowser, StringComparison.OrdinalIgnoreCase) > -1)
   {
       HttpContext.Current.Response.Redirect("/bannedBrowser.htm");
       Session.Abandon();
       break;
   }

它阻止代码转换器访问我的网站。但时不时地我会收到一条错误消息，说

System.Web.HttpException: Session state has created a session id, but cannot
  save it because the response was already flushed by the application.
    at System.Web.SessionState.SessionIDManager.SaveSessionID(
      HttpContext context, String id, Boolean& redirected, Boolean& cookieAdded)
    at System.Web.SessionState.SessionStateModule.CreateSessionId()
    at System.Web.SessionState.SessionStateModule.DelayedGetSessionId()
    at System.Web.SessionState.SessionStateModule.ReleaseStateGetSessionID()
    at System.Web.SessionState.SessionStateModule.OnReleaseState(Object source,
      EventArgs eventArgs)
    at System.Web.SessionState.SessionStateModule.OnEndRequest(Object source,
      EventArgs eventArgs)
    at System.Web.HttpApplication.SyncEventExecutionStep.System.Web
      .HttpApplication.IExecutionStep.Execute()
    at System.Web.HttpApplication.ExecuteStep(IExecutionStep step,
      Boolean& completedSynchronously)

只有当我尝试通过（例如）Google Transcoder 访问它时才会发生这种情况，但我想了解为什么会发生这种情况以及如何防止它发生。

我必须放弃会话，以便在刷新时重新评估用户代理。

Answer 1

您看过此帖子吗？

我遇到了这个异常（在不同的上下文中）并用以下方法修复了它......

void Session_Start(object sender, EventArgs e) 
{
string id = Session.SessionID;
}

Answer 2

您是否尝试过颠倒放弃会话与重定向的顺序？

Session.Abandon();
HttpContext.Current.Response.Redirect("/bannedBrowser.htm", true);