在单声道4.6.2 / Linux中，我注意到wget可以下载文件的速度与webclient.DownloadString之间的巨大差异，所以我做了一些testing来调查。 为什么wget比C＃快得多？ 从我自己的实验中，使用wget，下载文件，手动读取文件，最后删除下载的文件，比使用.DownloadString 。 我不正确地使用HttpWebRequest ？
更新：在mono / linux上，似乎使用AutomaticDecompression完全没有任何区别。 虽然我看不出有关单声道的任何问题。
Update2：由于input错误，我没有注意到本地WebClient类远比简单的扩展类快。 为什么mono在简单的扩展类和父类之间有巨大的性能差距？
class WC1 : System.Net.WebClient { protected override WebRequest GetWebRequest(Uri address) { var r = (HttpWebRequest) base.GetWebRequest(address); r.Pipelined = true; r.KeepAlive = true; r.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; return r; } } class WC2 : System.Net.WebClient { protected override WebRequest GetWebRequest(Uri address) { var r = (HttpWebRequest)base.GetWebRequest(address); r.Pipelined = true; r.KeepAlive = false; r.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; return r; } } class WC3 : System.Net.WebClient { protected override WebRequest GetWebRequest(Uri address) { var r = (HttpWebRequest)base.GetWebRequest(address); r.Pipelined = false; r.KeepAlive = true; r.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; return r; } } class WC4 : System.Net.WebClient { protected override WebRequest GetWebRequest(Uri address) { var r = (HttpWebRequest)base.GetWebRequest(address); r.Pipelined = false; r.KeepAlive = false; r.AutomaticDecompression = DecompressionMethods.Deflate | DecompressionMethods.GZip; return r; } } class Program { static List<string> CreateUrls(int c) { var urls = new List<string>(); for (var i = 0; i < c; i++) { urls.Add("http://foo.com/?" + i); } return urls; } static TimeSpan Test(WebClient wc, IEnumerable<string> urls) { var sw = new System.Diagnostics.Stopwatch(); sw.Start(); foreach (var u in urls) { wc.DownloadString(u); Console.Write("."); } sw.Stop(); return sw.Elapsed; } static void Main(string[] args) { var urlsPerTest = 200; var urls = CreateUrls(urlsPerTest * 6); var wc1 = new WC1(); var urls1 = urls.Take(urlsPerTest); var elapsed1 = Test(wc1, urls1); Console.WriteLine("WC1:" + elapsed1); var wc2 = new WC2(); var urls2 = urls.Skip(urlsPerTest * 1).Take(urlsPerTest); var elapsed2 = Test(wc2, urls2); Console.WriteLine("WC2:" + elapsed2); var wc3 = new WC3(); var urls3 = urls.Skip(urlsPerTest * 2).Take(urlsPerTest); var elapsed3 = Test(wc3, urls3); Console.WriteLine("WC3:" + elapsed3); var wc4 = new WC4(); var urls4 = urls.Skip(urlsPerTest * 3).Take(urlsPerTest); var elapsed4 = Test(wc4, urls4); Console.WriteLine("WC4:" + elapsed4); var wc5 = new WebClient(); var urls5 = urls.Skip(urlsPerTest * 4).Take(urlsPerTest); var elapsed5 = Test(wc5, urls5); Console.WriteLine("Webclient:" + elapsed5); var urls6 = urls.Skip(urlsPerTest * 5).Take(urlsPerTest); File.WriteAllLines("/tmp/foo.txt", urls6); var sw = new Stopwatch(); sw.Start(); var p = new Process(); p.StartInfo = new ProcessStartInfo(); p.StartInfo.Arguments = "--silent -i /tmp/foo.txt"; p.StartInfo.CreateNoWindow = true; p.StartInfo.FileName = "wget"; p.StartInfo.WorkingDirectory = "/tmp"; p.StartInfo.UseShellExecute = false; p.Start(); p.WaitForExit(); sw.Stop(); File.Delete("/tmp/foo.txt"); Console.WriteLine("Wget:" + sw.Elapsed); Console.ReadLine(); } }
WC1:00:01:20.6518416 WC2:00:01:16.3561090 WC3:00:01:18.4278756 WC4:00:01:25.5372973 Webclient:00:01:04.6749124 Wget:00:01:03.4862053