DownloadFile hangs after downloading file

[mrlife]

In the following example, only the "Begin download" console log is written. It successfully downloads the file, but never moves beyond the line with DownloadFile. No errors are thrown, and nothing shows up using the new logging with LogLevel.Trace.

If I add a downloadCallback to DownloadFile, that is called, yet it still never moves forward from that line.

Any ideas what could be happening?

using var sftp = new SftpClient("host", 123, "username", "password"));
sftp.Connect();

using (var fileStream = File.Create(@"C:\target\local\path\file.zip"))
{
    Console.WriteLine("Begin download");
    sftp.DownloadFile("/source/remote/path/file.zip", fileStream);
    Console.WriteLine("End download");
}

Console.WriteLine("Done");

[Rob-Hague]

Hard to say unfortunately. If you use the callback argument does it show anything? e.g.

sftp.DownloadFile("/source/remote/path/file.zip", fileStream, n => Console.WriteLine($"Read {n} bytes"));

Are you able to pause the program with a debugger and see where in the library it is stuck?

[mrlife]

@Rob-Hague, thanks for the suggestions. The DownloadFile callback's last printed line has the number of bytes of the file, matching ISftpFile.Length.

Debugging in the library code doesn't seem to be fully supported by my IDE, as breakpoints can be hit, but the code cannot be stepped through. I checked multiple break points in SftpClient.InternalDownloadFile but didn't find where it is getting stuck.

If you have any other suggestions, I will check them out.

[Rob-Hague]

This is not an ideal suggestion but you could pull the code from this repository and build it in Debug configuration. There is already a console app "AotCompatibilityTestApp" which can be useful for running quick tests