public async Task CopyFileAsync(FileInfo source, FileInfo destination, CopyFileOptions options, CancellationToken cancellationToken)
{
if (source == null)
{
throw new ArgumentNullException(nameof(source));
}
if (destination == null)
{
throw new ArgumentNullException(nameof(destination));
}
if ((options & ~CopyFileOptions.All) != 0) // if any bit in options is set which is not defined by CopyFileOptions
{
throw new ArgumentOutOfRangeException(nameof(options));
}
new FileIOPermission(FileIOPermissionAccess.Read, source.FullName).Demand();
new FileIOPermission(FileIOPermissionAccess.Write, destination.FullName).Demand();
CopyProgressRoutine cpr;
if (CopyFileProgressChanged != null)
{
var fileEventArgs = new CopyFileEventArgs(source, destination);
cpr = (totalFileSize, totalBytesTransferred,
streamSize, streamBytesTransferred, streamNumber, callbackReason, sourceFile, destinationFile, data) =>
{
try
{
cancellationToken.ThrowIfCancellationRequested();
var copyFileEventArgs = fileEventArgs;
copyFileEventArgs.TotalFileSize = totalFileSize;
copyFileEventArgs.TotalBytesTransferred = totalBytesTransferred;
OnCopyFileProgressChanged(copyFileEventArgs);
return((int)fileEventArgs.CallbackAction);
}
catch (OperationCanceledException)
{
return((int)CopyFileCallbackAction.Cancel);
}
};
}
else
{
cpr = null;
}
var cancel = false;
var copyFileExResult = await Task.Run(() =>
CopyFileEx(source.FullName, destination.FullName, cpr, IntPtr.Zero, ref cancel, (int)options), cancellationToken).ConfigureAwait(false);
if (!copyFileExResult)
{
throw new IOException(new Win32Exception().Message);
}
}
private void OnCopyFileProgressChanged(CopyFileEventArgs e)
{
CopyFileProgressChanged?.Invoke(this, e);
}