在asp.net中设置会话cookie的路径和过期时间

我试过的都没用。目前我有以下代码来更改asp.net会话cookie的过期日期和路径,但asp不想听我的。我在set cookie header中发送同一个cookie两次,有时忽略路径和过期日期发送默认cookie,有时按预期发送所有内容,有时根本不发送set cookie。我该怎么办。这让我发疯了:(

我在global.asax中的代码

protected void Application_PreRequestHandlerExecute(Object sender, EventArgs e)
{
  /// only apply session cookie persistence to requests requiring session information
  if (Context.Handler is IRequiresSessionState || Context.Handler is IReadOnlySessionState)
  {
    var sessionState = ConfigurationManager.GetSection("system.web/sessionState") as SessionStateSection;
    var cookieName = sessionState != null && !string.IsNullOrEmpty(sessionState.CookieName)
      ? sessionState.CookieName
      : "ASP.NET_SessionId";

    var timeout = sessionState != null
      ? sessionState.Timeout
      : TimeSpan.FromMinutes(20);

    /// Ensure ASP.NET Session Cookies are accessible throughout the subdomains.
    if (Request.Cookies[cookieName] != null && Session != null && Session.SessionID != null)
    {
      Response.Cookies[cookieName].Value = Session.SessionID;
      Response.Cookies[cookieName].Path = Request.ApplicationPath;
      Response.Cookies[cookieName].Expires = DateTime.Now.Add(timeout);
    }
  }
}