使用 Web客户端类 System.Net ：

var json = new WebClient().DownloadString("url");

记

请即 Web客户端是的IDisposable ，所以你可能会添加使用语句来此生产code。这将是这样的：

Keep in mind that WebClient is IDisposable, so you would probably add a using statement to this in production code. This would look like:

using (WebClient wc = new WebClient())
{
   var json = wc.DownloadString("url");
}