C#远程传输(二进制流)文件及判断远程文件是否存在

///1.判断远程文件是否存在  ///fileUrl:远程文件路径，包括IP地址以及详细的路径 private bool RemoteFileExists(string fileUrl)         {             bool result = false;//下载结果             WebResponse response = null;             try             {                 WebRequest req = WebRequest.Create(fileUrl);                 response = req.GetResponse();                 result = response == null ? false : true;             }             catch (Exception ex)             {                 result = false;             }             finally             {                 if (response != null)                 {                     response.Close();                 }             }             return result;         }                         /// 2.通过传入的url获取远程文件数据(二进制流)，大家可以通过Response.BinaryWrite()方法将获取的数据流输出         /// </summary>         /// <param name="url">图片的URL</param>         /// <param name="ProxyServer">代理服务器</param>         /// <returns>图片内容</returns>         public byte[] GetFile(string url, string proxyServer)         {             WebResponse rsp = null;             byte[] retBytes = null;             try             {                 Uri uri = new Uri(url);                 WebRequest req = WebRequest.Create(uri);                 rsp = req.GetResponse();                 Stream stream = rsp.GetResponseStream();                 if (!string.IsNullOrEmpty(proxyServer))                 {                     req.Proxy = new WebProxy(proxyServer);                 }                 using (MemoryStream ms = new MemoryStream())                 {                     int b;                     while ((b = stream.ReadByte()) != -1)                     {                         ms.WriteByte((byte)b);                     }                     retBytes = ms.ToArray();                 }             }             catch (Exception ex)             {                 retBytes = null;             }             finally             {                 if (rsp != null)                 {                     rsp.Close();                 }               ///将本地文件通过httpwebrequest上传到服务器           ///localFile:本地文件路径及文件名称,uploadUrl:远程路径(虚拟目录)           ///在远程路径中需要把文件保存在的文件夹打开权限设置，否则上传会失败          public bool UploadFileBinary(string localFile, string uploadUrl)         {             bool result = false;             HttpWebRequest req = null;             Stream reqStream = null;             FileStream rdr = null;             try             {                 req = (HttpWebRequest)WebRequest.Create(uploadUrl);                 req.Method = "PUT";                 req.AllowWriteStreamBuffering = true;                 // Retrieve request stream                 reqStream = req.GetRequestStream();                 // Open the local file                 rdr = new FileStream(localFile, FileMode.Open);                 byte[] inData = new byte[4096];                 int bytesRead = rdr.Read(inData, 0, inData.Length);                 while (bytesRead > 0)                 {                     reqStream.Write(inData, 0, bytesRead);                     bytesRead = rdr.Read(inData, 0, inData.Length);                 }                 rdr.Close();                 reqStream.Close();                 req.GetResponse();                 result = true;             }             catch (Exception e)             {                 result = false;             }             finally             {                 if (reqStream != null)                 {                     reqStream.Close();                 }                 if (rdr != null)                 {                     rdr.Close();                 }             }             return result;         }             }             return retBytes;         }

转载地址： http://www.cnblogs.com/tsgx108/archive/2008/11/18/1335618.html