使用HttpModule實現UrlRewritter

目前的Asp.net Web項目都實現了地址重寫，以實現真實頁面名稱隱藏，同時也更便於SEO優化，提高搜索引擎的收錄數量。

項目中要實現URL地址重寫，首先需要新建一個類(自定義名稱爲MyHttpModule),該類必須繼承IHttpModule接口，同時實現該接口的Init和Dispose方法。在Init方法中實現對地址的重寫。

建立好地址重寫類後，需要在Web.config文件的System.web節中註冊該HttpModule;格式爲<add name="隨便命名" type="HttpModule命名空間加類名,dll文件名"   />

例：

<httpModules> <add name="MyHttpModule" type="MyWeb.MyHttpModule,MyWeb"/> </httpModules>

 下面是HttpModule的生命週期：

using System; using System.Collections.Generic; using System.Text; using System.Web; namespace MyHttpModule { public class ValidaterHttpModule : IHttpModule { #region IHttpModule 成員 public void Dispose() {} public void Init(HttpApplication application) { application.BeginRequest += new EventHandler(application_BeginRequest); application.EndRequest += new EventHandler(application_EndRequest); application.PreRequestHandlerExecute += new EventHandler(application_PreRequestHandlerExecute); application.PostRequestHandlerExecute += new EventHandler(application_PostRequestHandlerExecute); application.ReleaseRequestState += new EventHandler(application_ReleaseRequestState); application.AcquireRequestState += new EventHandler(application_AcquireRequestState); application.AuthenticateRequest += new EventHandler(application_AuthenticateRequest); application.AuthorizeRequest += new EventHandler(application_AuthorizeRequest); application.ResolveRequestCache += new EventHandler(application_ResolveRequestCache); application.PreSendRequestHeaders += new EventHandler(application_PreSendRequestHeaders); application.PreSendRequestContent += new EventHandler(application_PreSendRequestContent); } void application_PreSendRequestContent(object sender, EventArgs e) { HttpApplication application = (HttpApplication)sender; application.Context.Response.Write("application_PreSendRequestContent<br/>"); } void application_PreSendRequestHeaders(object sender, EventArgs e) { HttpApplication application = (HttpApplication)sender; application.Context.Response.Write("application_PreSendRequestHeaders<br/>"); } void application_ResolveRequestCache(object sender, EventArgs e) { HttpApplication application = (HttpApplication)sender; application.Context.Response.Write("application_ResolveRequestCache<br/>"); } void application_AuthorizeRequest(object sender, EventArgs e) { HttpApplication application = (HttpApplication)sender; application.Context.Response.Write("application_AuthorizeRequest<br/>"); } void application_AuthenticateRequest(object sender, EventArgs e) { HttpApplication application = (HttpApplication)sender; application.Context.Response.Write("application_AuthenticateRequest<br/>"); } void application_AcquireRequestState(object sender, EventArgs e) { HttpApplication application = (HttpApplication)sender; application.Context.Response.Write("application_AcquireRequestState<br/>"); } void application_ReleaseRequestState(object sender, EventArgs e) { HttpApplication application = (HttpApplication)sender; application.Context.Response.Write("application_ReleaseRequestState<br/>"); } void application_PostRequestHandlerExecute(object sender, EventArgs e) { HttpApplication application = (HttpApplication)sender; application.Context.Response.Write("application_PostRequestHandlerExecute<br/>"); } void application_PreRequestHandlerExecute(object sender, EventArgs e) { HttpApplication application = (HttpApplication)sender; application.Context.Response.Write("application_PreRequestHandlerExecute<br/>"); } void application_EndRequest(object sender, EventArgs e) { HttpApplication application = (HttpApplication)sender; application.Context.Response.Write("application_EndRequest<br/>"); } void application_BeginRequest(object sender, EventArgs e) { HttpApplication application = (HttpApplication)sender; application.Context.Response.Write("application_BeginRequest<br/>"); } #endregion } }

地址重寫注意事項：被重寫的地址如果回發，重寫將失效；後綴名必須爲.aspx．如果是其他自定義後綴名，如.html則必須在iis將.net映射到aspnet_isapi.dll.這樣.net請求才能到達asp.net引擎．

更多請參考ASP.NET之基礎概念