Asp.net Request.Browser.Crawler - Dynamic Crawler List?

Question

I learned Why Request.Browser.Crawler is Always False in C# (http://www.digcode.com/default.aspx?page=ed51cde3-d979-4daf-afae-fa6192562ea9&article=bc3a7a4f-f53e-4f88-8e9

Answer 1

You could check (regex) against Request.UserAgent.

Peter Bromberg wrote a nice article about writing an ASP.NET Request Logger and Crawler Killer in ASP.NET.

Here is the method he uses in his Logger class:

public static bool IsCrawler(HttpRequest request)
{
   // set next line to "bool isCrawler = false; to use this to deny certain bots
   bool isCrawler = request.Browser.Crawler;
   // Microsoft doesn't properly detect several crawlers
   if (!isCrawler)
   {
       // put any additional known crawlers in the Regex below
       // you can also use this list to deny certain bots instead, if desired:
       // just set bool isCrawler = false; for first line in method 
       // and only have the ones you want to deny in the following Regex list
       Regex regEx = new Regex("Slurp|slurp|ask|Ask|Teoma|teoma");
       isCrawler = regEx.Match(request.UserAgent).Success;
   }
   return isCrawler;
}