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之前一直以为Response.Redirect (“default1.aspx”)的运行原理是这样的
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但经过断点测试发现不是,当程序执行到Response.Redirect (“default1.aspx”);时 下边会跳转到default1.aspx下的Page_Load()方法中。也就是说2,3根本没有运行,只有1跟4,浏览器在根据4返回的状态码来在前台地址栏显示出不同的url,说到这里了 咱们就反编译一把Response.Redirect看看里面的具体实现:
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(""); this.Write(""); } 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(" Object moved \r\n"); this.Write("Object moved to here.
\r\n"); this.Write("\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;
可以看出状态码和跳转地址是在这里赋值的,我邪恶的感觉到扩展IhttpModule可以拦截http状态码,使用js代码段来实现http页面的跳转,代码如下:
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(""); context.Response.StatusCode = 200; } } } }
然后再配置一下web.config