改源码是用来进行页面快照的捕捉的多线程实现，请各位高手指教。-Change source is used for the page to capture a snapshot of the realization of multi-threading, please expert advice.

c#实现的多线程的抓取网页数据的工具。方便，高效，简单易用-c# multi-threaded implementation of a tool for data capture page. Convenient, efficient, easy to use