private async Task AsyncModeCopyToAsync(Stream destination, int bufferSize, CancellationToken cancellationToken)
{
Debug.Assert(!_fileHandle.IsClosed, "!_handle.IsClosed");
Debug.Assert(CanRead, "_parent.CanRead");
bool canSeek = CanSeek;
if (canSeek)
{
VerifyOSHandlePosition();
}
try
{
await FileStreamHelpers
.AsyncModeCopyToAsync(_fileHandle, _path, canSeek, _filePosition, destination, bufferSize, cancellationToken)
.ConfigureAwait(false);
}
finally
{
// Make sure the stream's current position reflects where we ended up
if (!_fileHandle.IsClosed && CanSeek)
{
SeekCore(_fileHandle, 0, SeekOrigin.End);
}
}
}
