private void FtpProgress_DoWork(object sender, DoWorkEventArgs e)
{
BackgroundWorker bw = sender as BackgroundWorker;
FtpSettings f = e.Argument as FtpSettings;
// set up the host string to request. this includes the target folder and the target file name (based on the source filename)
string UploadPath = String.Format("{0}/{1}{2}", f.Host, f.TargetFolder == "" ? "" : f.TargetFolder + "/", Path.GetFileName(f.SourceFile));
if (!UploadPath.ToLower().StartsWith("ftp://"))
{
UploadPath = "ftp://" + UploadPath;
}
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(UploadPath);
request.UseBinary = true;
request.UsePassive = f.Passive;
request.Method = WebRequestMethods.Ftp.UploadFile;
request.Credentials = new NetworkCredential(f.Username, f.Password);
// Copy the contents of the file to the request stream.
long FileSize = new FileInfo(f.SourceFile).Length;
string FileSizeDescription = GetFileSize(FileSize); // e.g. "2.4 Gb" instead of 240000000000000 bytes etc...
int ChunkSize = 4096, NumRetries = 0, MaxRetries = 50;
long SentBytes = 0;
byte[] Buffer = new byte[ChunkSize]; // this buffer stores each chunk, for sending to the web service via MTOM
using (Stream requestStream = request.GetRequestStream())
{
using (FileStream fs = File.Open(f.SourceFile, FileMode.Open, FileAccess.Read, FileShare.ReadWrite))
{
int BytesRead = fs.Read(Buffer, 0, ChunkSize); // read the first chunk in the buffer
// send the chunks to the web service one by one, until FileStream.Read() returns 0, meaning the entire file has been read.
while (BytesRead > 0)
{
try
{
if (bw.CancellationPending)
{
return;
}
// send this chunk to the server. it is sent as a byte[] parameter, but the client and server have been configured to encode byte[] using MTOM.
requestStream.Write(Buffer, 0, BytesRead);
// sentBytes is only updated AFTER a successful send of the bytes. so it would be possible to build in 'retry' code, to resume the upload from the current SentBytes position if AppendChunk fails.
SentBytes += BytesRead;
// update the user interface
string SummaryText = String.Format("Transferred {0} / {1}", GetFileSize(SentBytes), FileSizeDescription);
bw.ReportProgress((int)(((decimal)SentBytes / (decimal)FileSize) * 100), SummaryText);
}
catch (Exception ex)
{
Debug.WriteLine("Exception: " + ex.ToString());
if (NumRetries++ < MaxRetries)
{
// rewind the filestream and keep trying
fs.Position -= BytesRead;
}
else
{
throw new Exception(String.Format("Error occurred during upload, too many retries. \n{0}", ex.ToString()));
}
}
BytesRead = fs.Read(Buffer, 0, ChunkSize); // read the next chunk (if it exists) into the buffer. the while loop will terminate if there is nothing left to read
}
}
}
using (FtpWebResponse response = (FtpWebResponse)request.GetResponse())
System.Diagnostics.Debug.WriteLine(String.Format("Upload File Complete, status {0}", response.StatusDescription));
}