c#实现抓取网络资源的网络蜘蛛。可以通过一个入口网址来扫描整个互联网的网址，并将这些扫描到的网址所指向的网络资源下载到本地。-C# realize grab web spider network resources. Through a portal site to scan the entire Internet web site, and will these scans to the url points to download to a local network resources.