<%@ Page Language="C#" %> <html xmlns="http://www.w3.org/1999/xhtml"> <head id="Head1" runat="server"> <script runat="server"> public string RootUrl { get { Uri requestUri = Context.Request.Url; HttpRequest request = Context.Request; string rootUrl = string.Format("{0}{1}{2}{3}{4}", requestUri.Scheme, Uri.SchemeDelimiter, requestUri.Host, requestUri.IsDefaultPort ? string.Empty : string.Format(":{0}", requestUri.Port), request.ApplicationPath); return rootUrl.EndsWith("/") ? rootUrl : string.Format("{0}/", rootUrl); } } protected override void Render(HtmlTextWriter writer) { StringBuilder sb = new StringBuilder(); HtmlTextWriter htw = new HtmlTextWriter(new StringWriter(sb)); base.Render(htw); string html = sb.ToString(); string tag = "a"; List<string> tags = new List<string>(); int limit = 0, lb = 0, ub = 0; string startTag = string.Format("<{0}", tag); string endTag = string.Format(">", tag); string lHtml = html.ToLower(); do { lb = lHtml.IndexOf(startTag, limit); if (lb > 0) { limit = ub = lHtml.IndexOf(endTag, lb) + endTag.Length; tags.Add(html.Substring(lb, ub - lb)); } else limit = lb; } while (limit > 0); foreach (string a in tags) { string link = a.ToLower(); link = link.Replace("'", "\""); lb = link.IndexOf("href"); lb = link.IndexOf("\"", lb); ub = link.IndexOf("\"", lb + 1); string href = link.Substring(lb + 1, ub - (lb + 1)); if (href.StartsWith("http://") && !href.StartsWith(this.RootUrl.ToLower())) { link = link.Replace(href, string.Format("{0}StopUrl.aspx", this.RootUrl)); html = html.Replace(a, link); } } writer.Write(html); } </script> </head> <body> <form id="form1" runat="server"> <div> <a href="About.aspx">About</a> <a href="Default.aspx">Home</a> <a href="http://www.yahoo.com">Yhaoo</a> <a href="http://localhost/ActiveTest/Test.aspx">Test Page</a> </div> </form> </body> </html>
Thursday, September 09, 2010
How to remove external links from a asp.net web page
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