public static void UploadFileAsync(string uriString, string fileName, string userName, string password)
{
ManualResetEvent waitObject;
Uri uri = new Uri(uriString);
FtpState ftpState = new FtpState();
FtpWebRequest request = (FtpWebRequest)WebRequest.Create(uri);
request.Method = WebRequestMethods.File.UploadFile;
request.Credentials = new NetworkCredential(userName, password);
ftpState.Request = request;
ftpState.FileName = fileName;
waitObject = ftpState.OperationComplete;
request.BeginGetRequestStream(new AsyncCallback(EndGetStreamCallback), ftpState);
// Block the current thread until all operations are complete.
waitObject.WaitOne();
if (ftpState.OperationException != null)
{
throw ftpState.OperationException;
}
else
{
Console.WriteLine("The operation completed - {0}", ftpState.StatusDescription);
}
}
private static void EndGetResponseCallback(IAsyncResult ar)
{
FtpState state = (FtpState)ar.AsyncState;
FtpWebResponse response = null;
try
{
response = (FtpWebResponse)state.Request.EndGetResponse(ar);
response.Close();
state.StatusDescription = response.StatusDescription;
// Signal the main application thread that
// the operation is complete.
state.OperationComplete.Set();
}
// Return exceptions to the main application thread.
catch (Exception e)
{
Console.WriteLine("Error getting response.");
state.OperationException = e;
state.OperationComplete.Set();
}
}
private static void EndGetStreamCallback(IAsyncResult ar)
{
FtpState state = (FtpState)ar.AsyncState;
Stream requestStream = null;
try
{
requestStream = state.Request.EndGetRequestStream(ar);
// Copy the file contents to the request stream.
const int bufferLength = 2048;
byte[] buffer = new byte[bufferLength];
int count = 0;
int readBytes = 0;
FileStream stream = File.OpenRead(state.FileName);
do
{
readBytes = stream.Read(buffer, 0, bufferLength);
requestStream.Write(buffer, 0, readBytes);
count += readBytes;
}while (readBytes != 0);
Console.WriteLine("Writing {0} bytes to the stream.", count);
// IMPORTANT: Close the request stream before sending the request.
requestStream.Close();
// Asynchronously get the response to the upload request.
state.Request.BeginGetResponse(
new AsyncCallback(EndGetResponseCallback),
state
);
}
// Return exceptions to the main application thread.
catch (Exception e)
{
Console.WriteLine("Could not get the request stream.");
state.OperationException = e;
state.OperationComplete.Set();
return;
}
}
