Csharp:WebClient and WebRequest use http download file

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//Csharp:WebClient and WebRequest use http download file             //20140318 塗聚文收錄             string filePath = "20140302.pdf";             string fileName = "http://www.dusystem.com/3.pdf";                 //1出现找不到文件 filePath             //string headerValue = (Request.UserAgent.ToLower().Contains("msie"))? string.Format("attachment; filename=\"{0}\"", Uri.EscapeDataString(fileName)): string.Format("attachment; filename=\"{0}\"", fileName); //for Firefox, Chrome, Safari, Opera             //Response.Clear();             //Response.ContentType = "text/plain";             //Response.AddHeader("Content-Disposition", headerValue);             //Response.TransmitFile(filePath);             //Response.End();                 //2： 有效   WebException ex             //System.Net.WebClient net = new System.Net.WebClient();             //string link = fileName;             //Response.ClearHeaders();             //Response.Clear();             //Response.Expires = 0;             //Response.Buffer = true;             //Response.AddHeader("Accept-Language", "utf-8");             //Response.AddHeader("Content-Disposition", "Attachment;FileName=" + System.Web.HttpUtility.UrlEncode(link, System.Text.Encoding.UTF8));             //Response.ContentType = "APPLICATION/octet-stream";             //Response.BinaryWrite(net.DownloadData(link));             //Response.End();                 //3:有效,但文件是空             //string dir = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);             //string myFileName = dir + @"\213.pdf";             //HttpWebRequest request = (HttpWebRequest)WebRequest.Create(fileName);  //                         //request.MaximumResponseHeadersLength = 40000;             //request.Timeout = 20000;             //request.Credentials = CredentialCache.DefaultCredentials;             //HttpWebResponse response = (HttpWebResponse)request.GetResponse();             //Stream receiveStream = response.GetResponseStream();             //StreamReader readStream = new StreamReader(receiveStream, Encoding.UTF8);               //using (StreamWriter sw = new StreamWriter(myFileName, false, Encoding.UTF8))             //{             //    sw.Write(readStream.ReadToEnd());             //    sw.Flush();             //    sw.Close();               //}                 //4。有效             //byte[] result;             //byte[] buffer = new byte[4096];             //string link = fileName;             //WebRequest wr = WebRequest.Create(fileName);             //WebResponse response = wr.GetResponse();             //Stream responseStream = response.GetResponseStream();             //MemoryStream memoryStream = new MemoryStream();             //Response.AddHeader("Accept-Language", "utf-8");             //Response.AddHeader("Content-Disposition", "Attachment;FileName=" + System.Web.HttpUtility.UrlEncode(link, System.Text.Encoding.UTF8));             //Response.ContentType = "APPLICATION/octet-stream";             //int count = 0;             //do             //{             //    count = responseStream.Read(buffer, 0, buffer.Length);             //    memoryStream.Write(buffer, 0, count);             //    Response.BinaryWrite(buffer);             //    //Response.OutputStream.Write(buffer,0,count);             //}             //while (count != 0);             //result = memoryStream.ToArray();                 //5。有效             string dir = Environment.GetFolderPath(Environment.SpecialFolder.DesktopDirectory);             string fullFileName = dir + @"\213.pdf";             HttpWebRequest hRequest = (HttpWebRequest)WebRequest.Create(fileName);             WebResponse response = hRequest.GetResponse();             using (response = (HttpWebResponse)hRequest.GetResponse())             {                 /*Download the file to the fullFileName location */                 Stream streamResponse = response.GetResponseStream();                 if (streamResponse != null)                 {                     byte[] inBuf = new byte[response.ContentLength];                     int bytesToRead = System.Convert.ToInt32(inBuf.Length);                     int bytesRead = 0;                     while (bytesToRead > 0)                     {                         int n = streamResponse.Read(inBuf, bytesRead, bytesToRead);                         if (n == 0)                         {                             break;                         }                         bytesRead += n;                         bytesToRead -= n;                     }                       FileStream fstr = new FileStream(fullFileName, FileMode.OpenOrCreate, FileAccess.Write);                     fstr.Write(inBuf, 0, bytesRead);                     streamResponse.Close();                     streamResponse.Dispose();                     fstr.Close();                     fstr.Dispose();                 }             }