public static bool UploadToFTP(string strFileName,string strFolderName)
{
bool isUploaded = false;
string strFilename = string.Empty;
string strFtpURI = string.Empty;
string strFtpUserId = string.Empty;
string strFtpPassword = string.Empty;
byte[] buffer = null;
FileInfo oFileInfo = null;
FileStream oFileStream = null;
FtpWebRequest oFtpWebRequest = null;
try
{
strFilename = strFileName;
oFileInfo = new FileInfo(strFilename);
strFtpURI = Constants.FtpUri;
strFtpUserId = Constants.FtpUserID;
strFtpPassword = Constants.FtpPassword;
oFtpWebRequest = (FtpWebRequest)FtpWebRequest.Create(new Uri(strFtpURI + "/" + strFolderName + "/" + oFileInfo.Name));
oFtpWebRequest.Credentials = new NetworkCredential(strFtpUserId,strFtpPassword);
oFtpWebRequest.Proxy = null;
oFtpWebRequest.KeepAlive = false;
oFtpWebRequest.Method = WebRequestMethods.Ftp.UploadFile;
oFtpWebRequest.UseBinary = true;
oFtpWebRequest.ContentLength = oFileInfo.Length;
int iBufferLength = 2084;
buffer = new byte[iBufferLength];
int iContentLength = 0;
oFileStream = oFileInfo.OpenRead();
try
{
iContentLength = oFileStream.Read(buffer,iBufferLength);
using (Stream oStream = oFtpWebRequest.GetRequestStream())
{
while (iContentLength != 0)
{
oStream.Write(buffer,iContentLength);
iContentLength = oFileStream.Read(buffer,iBufferLength);
}
isUploaded = true;
FtpUpload.TotalKBFilesUploaded = FtpUpload.TotalKBFilesUploaded + (int)(oFileInfo.Length / 1000);
}
}
catch (Exception ex)
{
}
finally
{
if (oFtpWebRequest != null)
{
oFtpWebRequest.Abort();
oFtpWebRequest = null;
}
if (buffer != null)
{
buffer = null;
}
if (oFileStream != null)
{
oFileStream.Close();
oFileStream.Dispose();
}
}
}
catch (Exception ex)
{
}
finally
{
oFileInfo = null;
}
return isUploaded;
}
这是将1000个图像上传到FTP,这种方法以多线程方式调用.
不同的错误是：
================================================== =====
消息：操作已超时
错误跟踪：在System.Net.FtpWebRequest.GetRequestStream()处的System.Net.FtpWebRequest.CheckError()处
================================================== =====
错误消息：无法连接到远程服务器
错误跟踪：在System.Net.FtpWebRequest.GetRequestStream()处的System.Net.FtpWebRequest.CheckError()处
================================================== =====
错误跟踪：System.Net上的System.Net.FtpWebRequest.CheckError()位于System.Net.FtpWebRequest.FinpRequestStage(RequestStage阶段)的System.Net.CommandStream.Abort(Exception e)上的System.Net.FtpWebRequest.SyncRequestCallback(Object obj)处System.Net.FtpWebRequest.GetRequestStream()
================================================== =====
错误消息：无法将数据写入传输连接：连接尝试失败,因为连接方在一段时间后没有正确响应,或者由于连接的主机无法响应而建立的连接失败.
错误跟踪：System.Net.Sockets.NetTream.Write(Byte []缓冲区,Int32偏移量,Int32大小)在System.Net.FtpDataStream.Write(Byte []缓冲区,Int32大小)处
================================================== =====
什么可能导致这个？或者我需要提供更多细节？
解决方法
Error Message:The underlying connection was closed: An unexpected error occurred on a receive.
正如msdn文档中所解释的那样,超时的默认值是无限的,但msdn文档包含一个错误：
http://msdn.microsoft.com/fr-fr/library/vstudio/system.net.ftpwebrequest.timeout(v=vs.80).aspx
实际上,默认值为100000毫秒(1分40秒),因此您可以使用以下函数将值Timeout声明为无限：oFtpWebRequest.Timeout = -1;
