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Response.Redirect 原理及實(shí)現(xiàn)

發(fā)布時(shí)間：2020-08-04 11:00:16 來(lái)源：網(wǎng)絡(luò) 閱讀：938 作者：tongling_zzu 欄目：編程語(yǔ)言

之前一直以為Response.Redirect （“default1.aspx”）的運(yùn)行原理是這樣的Response.Redirect 原理及實(shí)現(xiàn)

但經(jīng)過(guò)斷點(diǎn)測(cè)試發(fā)現(xiàn)不是，當(dāng)程序執(zhí)行到Response.Redirect （“default1.aspx”）；時(shí) 下邊會(huì)跳轉(zhuǎn)到default1.aspx下的Page_Load（）方法中。也就是說(shuō)2，3根本沒(méi)有運(yùn)行，只有1跟4，瀏覽器在根據(jù)4返回的狀態(tài)碼來(lái)在前臺(tái)地址欄顯示出不同的url，說(shuō)到這里了 咱們就反編譯一把Response.Redirect看看里面的具體實(shí)現(xiàn)：

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(tài)碼和跳轉(zhuǎn)地址是在這里賦值的，我邪惡的感覺(jué)到擴(kuò)展IhttpModule可以攔截http狀態(tài)碼，使用js代碼段來(lái)實(shí)現(xiàn)http頁(yè)面的跳轉(zhuǎn)，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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