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之前一直以為Response.Redirect （“default1.aspx”）的運行原理是這樣的
但經過斷點測試發現不是，當程序執行到Response.Redirect （“default1.aspx”）；時 下邊會跳轉到default1.aspx下的Page_Load（）方法中。也就是說2，3根本沒有運行，只有1跟4，瀏覽器在根據4返回的狀態碼來在前臺地址欄顯示出不同的url，說到這里了 咱們就反編譯一把Response.Redirect看看里面的具體實現：
internalvoidRedirect(string url, bool endResponse, bool permanent)
{
if (url == null)
{
thrownewArgumentNullException("url");
}
if (url.IndexOf('\n') >= 0)
{
thrownewArgumentException(SR.GetString("Cannot_redirect_to_newline"));
}
if (this._headersWritten)
{
thrownewHttpException(SR.GetString("Cannot_redirect_after_headers_sent"));
}
Pagepage = this._context.HandlerasPage;
if ((page != null) && page.IsCallback)
{
thrownewApplicationException(SR.GetString("Redirect_not_allowed_in_callback"));
}
url = this.ApplyRedirectQueryStringIfRequired(url);
url = this.ApplyAppPathModifier(url);
url = this.ConvertToFullyQualifiedRedirectUrlIfRequired(url);
url = this.UrlEncodeRedirect(url);
this.Clear();
if (((page != null) && page.IsPostBack) && (page.SmartNavigation && (this.Request["__smartNavPostBack"] == "true")))
{
this.Write("<BODY><ASP_SMARTNAV_RDIR url=\"");
this.Write(HttpUtility.HtmlEncode(url));
this.Write("\"></ASP_SMARTNAV_RDIR>");
this.Write("</BODY>");
}
else
{
this.StatusCode = permanent ? 0x12d : 0x12e;
this.RedirectLocation = url;
if (UriUtil.IsSafeScheme(url))
{
url = HttpUtility.HtmlAttributeEncode(url);
}
else
{
url = HttpUtility.HtmlAttributeEncode(HttpUtility.UrlEncode(url));
}
this.Write("<html><head><title>Object moved</title></head><body>\r\n");
this.Write("<h3>Object moved to <a href=\"" + url + "\">here</a>.</h3>\r\n");
this.Write("</body></html>\r\n");
}
this._isRequestBeingRedirected = true;
EventHandlerredirecting = Redirecting;
if (redirecting != null)
{
redirecting(this, EventArgs.Empty);
}
if (endResponse)
{
this.End();
}
}其中由37，38行的
this.StatusCode = permanent ? 0x12d : 0x12e;this.RedirectLocation = url;可以看出狀態碼和跳轉地址是在這里賦值的，我邪惡的感覺到擴展IhttpModule可以攔截http狀態碼，使用js代碼段來實現http頁面的跳轉，代碼如下：
using System;
using System.Collections.Generic;
using System.Text;
using System.Web;
namespace ClassLibrary2
{
public class Class1 : System.Web.IHttpModule
{
public void Init(HttpApplication application)
{
application.PreSendRequestHeaders += new EventHandler(application_PreSendRequestHeaders);
}
private void application_PreSendRequestHeaders(object sender, EventArgs e)
{
HttpApplication Application = (HttpApplication) sender;
HttpContext context = Application.Context;
if (context.Response.StatusCode == 302)
{
context.Response.Write("<script>window.open(’" + context.Response.RedirectLocation + "’)</script>");
context.Response.StatusCode = 200;
}
}
}
}
然后再配置一下web.config
<?xml version="1.0"?> <configuration> <system.web> <compilation debug="true"/> <authentication mode="Windows"/> <httpModules> <add name="MyModule" type="ClassLibrary2.Class1,ClassLibrary2"></add> </httpModules> </system.web> </configuration>
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