最简单的方法是对该类使用内置的自动解压缩功能
HttpWebRequest。
var request = (HttpWebRequest)HttpWebRequest.Create("http://stackoverflow.com");request.Headers.Add(HttpRequestHeader.AcceptEncoding, "gzip,deflate");request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate;为此，
WebClient您必须使自己的类派生
WebClient并覆盖该
GetWebRequest()方法。
public class GZipWebClient : WebClient{ protected override WebRequest GetWebRequest(Uri address) { HttpWebRequest request = (HttpWebRequest)base.GetWebRequest(address); request.AutomaticDecompression = DecompressionMethods.GZip | DecompressionMethods.Deflate; return request; }}另请参见此SO线程：.NET的HttpWebResponse是否自动解压缩GZiped和Deflated响应？
