ErrorPage无法捕获Exception

Question

普通頁面：protected void Page_Load(object sender, EventArgs e)    {        throw new Exception("hello");    }ErrorPage: protected void Page_Error(object sender, EventArgs e)    {        Response.Write(Server.GetLastError().GetBaseException().Message);        Server.ClearError();    }Web.Config<customErrors mode="On" defaultRedirect="ErrorPage.aspx"/> 問題：ErrorPage.aspx的Server.GetLastError()总是为空，如何才能获取出错页面的Exception Message呢?