Question

C# webclient 下载文件时候出错

//作用是下载某个网站上的网页图标 Uri uri = new Uri(txtUrl.Text); System.Net.WebClient DownloadIcon=new WebClient (); string downloadIconFilepath = Application.StartupPath + "\\webIcon\\" + uri.Host.Replace(".","") + ".ico"; // try { //DownloadIcon.DownloadFile(uri.GetLeftPart(UriPartial.Authority) + "/favicon.ico",downloadIconFilepath); } // catch { } 当下载 http://china.alibaba.com/favicon.ico 时候，出现错误，服务器错误（503） 其他网站大部分可以下载，为什么

Answer 1

//作用是下载某个网站上的网页图标 Uri uri = new Uri(txtUrl.Text); System.Net.WebClient DownloadIcon=new WebClient (); DownloadIcon.Headers.Add("User-Agent", "Mozilla/4.0 (compatible; MSIE 6.0; Windows NT 5.1"); string downloadIconFilepath = Application.StartupPath + "\\webIcon\\" + uri.Host.Replace(".","") + ".ico"; DownloadIcon.DownloadFile(uri.GetLeftPart(UriPartial.Authority) + "/favicon.ico",downloadIconFilepath);