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We have a C# Windows service polling a folder waiting for an FTP’ed file to be posted in. To avoid using the file when it is still being written to we attempt to get a lock on the file first, however, there seems to be occasions where we are getting a lock on the file after the FTP’ed file is created but before the file is written to, so we end up opening an empty file.
Is there a reliable anyway to tell if the FTP is complete?
What about using a folder watcher to index the contents and if a files size does not change within 5 mins you can pretty-much guarantee the upload has been finished.
The time out could be tied to the timeout of your FTP server to.
http://www.codeproject.com/KB/files/MonitorFolderActivity.aspx