public async Task <VirtualFile> CopyFile(VirtualFile file, VirtualDirectory targetDirectory, Action <ProgressArgs> progressCallback, CancellationToken cancellationToken)
{
var fileEntry = getFileEntry(file);
var filename = VirtualPath.GetFileName(file.Name);//get filename from full path
if (fileEntry.DirectoryId == targetDirectory.Id)
{
filename = $"Copy {filename}";
}
var idx = 0;
while (targetDirectory.GetFiles(false, filename).Any())
{
var name = VirtualPath.GetFileNameWithoutExtension(filename);
var ext = VirtualPath.GetFileExtension(filename);
filename = $"{name} ({++idx}).{ext}";
}
var createdFile = targetDirectory.CreateFile(filename);
using (var newFileStream = createdFile.Open(FileMode.Open, FileAccess.Write))
using (var sourceFileStream = file.Open(FileMode.Open, FileAccess.Read))
{
newFileStream.SetLength(sourceFileStream.Length);
var restBytes = sourceFileStream.Length;
var buffer = BufferHelper.GetBuffer(sourceFileStream);
var currentProgress = -1;
while (restBytes > 0 && !cancellationToken.IsCancellationRequested)
{
try
{
var count = (int)(restBytes > buffer.Length ? buffer.Length : restBytes);
var read = await sourceFileStream.ReadAsync(buffer, 0, count, cancellationToken);
await newFileStream.WriteAsync(buffer, 0, count, cancellationToken);
restBytes -= read;
}
catch (TaskCanceledException)
{
}
//report progress
var progress = sourceFileStream.GetProgress();
if (progress == currentProgress)
{
continue;
}
currentProgress = progress;
var message = VirtualPath.GetFileName(createdFile.Name);
var progressArgs = new CopyProgressArgs(progress, message)
{
Operation = Operation.Copying
};
_synchronizationContext.Post(x => progressCallback?.Invoke((ProgressArgs)x), progressArgs);
}
}
if (!cancellationToken.IsCancellationRequested)
{
return(createdFile);
}
Remove(createdFile);
_directoryWatcherSource.RaiseDeleted(targetDirectory, file);
return(createdFile);
}