private async Task QuickDeleteDeltaFilesAsync(IProgress <DeletionProgressReportModel> progress, CancellationToken cancellationToken)
{
object sync = new object();
DeletionProgressReportModel progressReport = new DeletionProgressReportModel(MyDeltaFiles.Count);
ParallelOptions po = new ParallelOptions();
po.CancellationToken = cancellationToken;
po.MaxDegreeOfParallelism = System.Environment.ProcessorCount;
await Task.Run(() =>
{
Parallel.ForEach <FileDescriptorModel>(MyDeltaFiles, po, (fd) =>
{
DeleteSingleDeltaFile(fd);
lock (sync)
{
progressReport.DeletedFilesNo++;
// We cannot remove MyDeltaFiles list elements - because List type isn't thread safe
// But somehow we can add to the list in the progress report (that's what Tim Corey does, and it works for him...)
// We have to do this in order to remove deleted files from the MyDeltaFiles list after the parallel loop finishes.
SessionDeletedFiles.Add(fd);
progress.Report(progressReport);
}
po.CancellationToken.ThrowIfCancellationRequested();
});
});
return;
}
private async Task DeleteDeltaFilesAsync(IProgress <DeletionProgressReportModel> progress, CancellationToken cancellationToken)
{
DeletionProgressReportModel progressReport = new DeletionProgressReportModel(MyDeltaFiles.Count);
bool ContinueAsking = true;
List <FileDescriptorModel> IterationListCopy = new List <FileDescriptorModel>();
for (int i = MyDeltaFiles.Count - 1; i >= 0; i--)
{
var fd = MyDeltaFiles[i];
if (ContinueAsking)
{
// ask user to confirm deletion in modal message box, by checking the returned result (Cancel, Skip, Delete, Delete All)
MessageBoxResult result = WWMessageBox.ShowOKYesNoCancel($"Confirm deletion of the file:\n{ fd.FullName }", "User decision required", "Delete All", "Delete this one", "Skip", "Cancel", MessageBoxImage.Question);
switch (result)
{
case MessageBoxResult.OK:
ContinueAsking = false;
break;
case MessageBoxResult.Yes:
break;
case MessageBoxResult.No:
continue;
case MessageBoxResult.Cancel:
return;
default:
break;
}
}
await Task.Run(() => DeleteSingleDeltaFile(fd));
progressReport.DeletedFilesNo++;
progressReport.CurrentFd = fd;
progress.Report(progressReport);
cancellationToken.ThrowIfCancellationRequested();
}
return;
}
private void ProgressReportedEventHandler(object sender, DeletionProgressReportModel e)
{
MyDeletedFilesNo = e.DeletedFilesNo;
MyDeletionProgress = e.DeletionProgress;
OnPropertyRaised("MyDeletionProgress");
if (e.CurrentFd != null)
{
// Do this only when deletion is a single-threaded sequential operation (non-parallel)
if (MyDeltaFiles.Contains(e.CurrentFd))
{
MyDeltaFiles.Remove(e.CurrentFd);
MyDeltaFilesView.Refresh();
QualifiedRawNo--;
OnPropertyRaised("MyDeltaFilesNo");
OnPropertyRaised("MyRejectionRatio");
}
}
}
