A Simple Crawler Using C# Sockets
http://www.codeproject.com/cs/internet/Crawler.asp
Populating a Search Engine with a C# Spider
http://www.codeproject.com/aspnet/Spideroo.asp
A Web Spider Library in C#
http://www.codeproject.com/useritems/ZetaWebSpider.asp
转载于:https://www.cnblogs.com/evernory/archive/2006/11/08/554172.html