我在这个函数中遇到了很多不同的问题:
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, 0, iBufferLength);
using (Stream oStream = oFtpWebRequest.GetRequestStream())
{
while (iContentLength != 0)
{
oStream.Write(buffer, 0, iContentLength);
iContentLength = oFileStream.Read(buffer, 0, 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张图像上传到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:位于System.Net.FtpWebRequest.GetRequestStream()的System.Net.FtpWebRequest.CheckError()
============================================ ===========
错误消息:无法连接到远程服务器
错误跟踪:位于System.Net.FtpWebRequest.GetRequestStream()的System.Net.FtpWebRequest.CheckError()
============================================ ===========
错误消息:基础连接已关闭:接收时发生意外错误。
错误跟踪:System.Net上的System.Net.FtpWebRequest.CheckError()处于System.Net.FtpWebRequest.FinishRequestStage上的System.Net.CommandStream.Abort(例外e)处的System.Net.FtpWebRequest.SyncRequestCallback(Object obj)处(RequestStage)阶段)在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,或者由于连接主机无法响应而建立连接失败。
错误跟踪:在System.Net.FtpDataStream.Write的System.Net.Sockets.NetworkStream.Write(Byte []缓冲区,Int32偏移量,Int32大小)处(Byte []缓冲区,Int32偏移量,Int32大小) 的 =============================================== ========
这些是来自我从LOG文件中检索到的相同方法的一些错误。
知道可能导致这种情况的原因是什么?或者我需要提供更多细节?
答案 0 :(得分:7)
达到超时时遇到以下异常:
错误消息:基础连接已关闭:接收时发生意外错误。
如msdn文档中所述,超时的默认值是无限的,但msdn文档包含错误: 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;