ASP.NET 实现 URL 重写的方法

 通过 Global.asax 实现重写，可以将重写的配置信息保存到 Web.config 中，也可以定义自己的配置文件。

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/// <summary> /// 初始化重写模块。 /// </summary> /// <param name="app">应用程序对象。</param> public void Init(HttpApplication app) {     //RoutingSection section =     //    (RoutingSection)ConfigurationManager.GetSection("routeConfiguration");     //if (null == section)     //{     //    throw new Exception("还没有配置你的 Route 规则,请配置你的 Route 规则");     //}     //if (RouteTable.Routes.Count == 0)     //{     //    RouteTable.Routes.RegisterRoutes(section);     //}     //app.BeginRequest += new EventHandler(this.RewriteBeginRequest);     //app.BeginRequest += new EventHandler(this.SessionStart);     RegisterRoutes(RouteTable.Routes); }      /// <summary> /// 使用指定路径重写 URL，并处理 URL 参数。 /// </summary> /// <param name="context"></param> /// <param name="sendToUrl"></param> protected void RewritePath(HttpContext context, string sendToUrl) {     if (context.Request.QueryString.Count > 0)     {         if (sendToUrl.IndexOf('?') != -1)         {             sendToUrl += "&" + context.Request.QueryString.ToString();         }         else         {             sendToUrl += "?" + context.Request.QueryString.ToString();         }     }     string queryString = String.Empty;     string sendToUrlLessQString = sendToUrl;     if (sendToUrl.IndexOf('?') > 0)     {         sendToUrlLessQString = sendToUrl.Substring(0, sendToUrl.IndexOf('?'));         queryString = sendToUrl.Substring(sendToUrl.IndexOf('?') + 1);     }     context.RewritePath(sendToUrlLessQString, String.Empty, queryString); } /// <summary> /// 处理各种路径 /// </summary> /// <param name="appPath"></param> /// <param name="url"></param> /// <returns></returns> public string ResolveUrl(string appPath, string url) {     //   return url;     if (url.Length == 0 || url[0] != '~')         return url;        // there is no ~ in the first character position, just return the url     else     {         if (url.Length == 1)             return appPath;  // there is just the ~ in the URL, return the appPath         if (url[1] == '/' || url[1] == '\\')         {             // url looks like ~/ or ~\             if (appPath.Length > 1)                 return appPath + "/" + url.Substring(2);             else                 return "/" + url.Substring(2);         }         else         {             // url looks like ~something             if (appPath.Length > 1)                 return appPath + "/" + url.Substring(1);             else                 return appPath + url.Substring(1);         }     } }   #region Url Rewrite... /// <summary> /// 开始重写。 /// </summary> /// <param name="sender">应用程序对象。</param> /// <param name="e">事件对象。</param> private void RewriteBeginRequest(object sender, EventArgs e) {     HttpApplication app = (HttpApplication)sender;     //初始化 Url 重写规则。     Dictionary<string, string> urlRewrite = CacheProvider.GetRewrite();     foreach (KeyValuePair<string, string> urlRule in urlRewrite)     {         // string lookFor = ResolveUrl(app.Request.ApplicationPath, urlRule.Key);         string lookFor = "^" + ResolveUrl(app.Request.ApplicationPath, urlRule.Key) + "$";         Regex re = new Regex(lookFor, RegexOptions.IgnoreCase);         if (re.IsMatch(app.Request.Path))         {             string sendTo = ResolveUrl(app.Context.Request.ApplicationPath, re.Replace(app.Request.Path, urlRule.Value));             RewritePath(app.Context, sendTo);         }         //if (!string.IsNullOrEmpty(urlRewrite) && !string.IsNullOrEmpty(urlRule.Key))         //{         //    if (Regex.IsMatch(urlRewrite, urlRule.Key, RegexOptions.IgnoreCase))         //    {         //        return Regex.Replace(urlRewrite, urlRule.Key, urlRule.Value, RegexOptions.IgnoreCase);         //    }         //}     }     //if (!string.IsNullOrEmpty(urlRewrite))     //{     //    app.Context.RewritePath(urlRewrite);     //} } #endregion