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ASP.NET頁面跳轉Response.Redirect拋出異常

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在ASP.NET按鈕響應中跳轉到其他的頁面，會拋出異常’Thread was being aborted’，如下代碼

try
{
    string redirectUrl = "~/Default.aspx";
    Response.Redirect(redirectUrl);
}
catch (System.Exception ex)
{
}

 

在微軟的網站上找到有對應的問題：

ThreadAbortException Occurs If You Use Response.End, Response.Redirect, or Server.Transfer

 

按照微軟的解決方案，只要調用Response.Redirect的重載函數Response.Redirect(String url, bool endResponse)，其中endResponse傳入false就可以了

Response.Redirect(redirectUrl,false);
我看了一下ASP.NET的原始碼，其中會拋出一個異常，下面是代碼：
     /// <devdoc>      ///    <para>Redirects a client to a new URL.</para>      /// </devdoc>        public void Redirect(String url, bool endResponse) {             if (url == null)                throw new ArgumentNullException("url");            if (url.IndexOf('\n') >= 0)                 throw new ArgumentException(SR.GetString(SR.Cannot_redirect_to_newline));             if (_headersWritten)                 throw new HttpException(SR.GetString(SR.Cannot_redirect_after_headers_sent));             Page page = _context.Handler as Page;            if ((page != null) && page.IsCallback) {                throw new ApplicationException(SR.GetString(SR.Redirect_not_allowed_in_callback));            }             url = ApplyRedirectQueryStringIfRequired(url);              url = ApplyAppPathModifier(url);             url = ConvertToFullyQualifiedRedirectUrlIfRequired(url);            url = UrlEncodeRedirect(url);             Clear();             // If it's a Page and SmartNavigation is on, return a short script             // to perform the redirect instead of returning a 302 (bugs ASURT 82331/86782)#pragma warning disable 0618    // To avoid SmartNavigation deprecation warning             if (page != null && page.IsPostBack && page.SmartNavigation && (Request["__smartNavPostBack"] ==        "true")) {#pragma warning restore 0618                Write("<BODY><ASP_SMARTNAV_RDIR url=\"");                Write(HttpUtility.HtmlEncode(url));                 Write("\"></ASP_SMARTNAV_RDIR>");                 Write("</BODY>");             }            else {                 this.StatusCode = 302;                RedirectLocation = url;                Write("<html><head><title>Object moved</title></head><body>\r\n");                Write("<h2>Object moved to <a href=\"" + HttpUtility.HtmlAttributeEncode(url) + "\">here</a>.</h2>\r\n");                 Write("</body></html>\r\n");            }              _isRequestBeingRedirected = true;             if (endResponse)                End();        }        /*         * Cancelles handler processing of the current request          * throws special [non-]exception uncatchable by the user code         * to tell application to stop module execution.          */         /// <devdoc>         ///    <para>Sends all currently buffered output to the client then closes the        ///       socket connection.</para>        /// </devdoc>        public void End() {             if (_context.IsInCancellablePeriod) {                 InternalSecurityPermissions.ControlThread.Assert();                 Thread.CurrentThread.Abort(new HttpApplication.CancelModuleException(false));            }             else {                // when cannot abort execution, flush and supress further output                if (!_flushing) { // ignore Reponse.End while flushing (in OnPreSendHeaders)                    Flush();                     _ended = true;                     if (_context.ApplicationInstance != null) {                         _context.ApplicationInstance.CompleteRequest();                    }                 }            }        }

上面的紅色代碼Thread.CurrentThread.Abort裡面就會拋出異常，只要執行還在容許Cancel的時間都會拋異常。

當然什麼時候會不容許呢（_context.IsInCancellablePeriod為false），我倒是沒看了。

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