Systemfilewatcher未正确触发已删除事件

我有一个文件查看器：

private void initFileWatcherActive()
    {
        try
        {
            FileSystemWatcher watcher = new FileSystemWatcher();
            watcher.Path = Global.Directory + Global.Machine + "''" + Machines.Directories.Aktiv;
            watcher.NotifyFilter = NotifyFilters.Attributes |
            NotifyFilters.CreationTime |
            NotifyFilters.DirectoryName |
            NotifyFilters.FileName |
            NotifyFilters.LastAccess |
            NotifyFilters.LastWrite;
            watcher.IncludeSubdirectories = false;
            watcher.Filter = "*.*";
            watcher.InternalBufferSize = 24000;

            watcher.Created -= new FileSystemEventHandler(OnChangedActive);
            watcher.Deleted -= new FileSystemEventHandler(OnChangedActive);
            watcher.Created += new FileSystemEventHandler(OnChangedActive);
            watcher.Deleted += new FileSystemEventHandler(OnChangedActive);
            watcher.EnableRaisingEvents = true;
        }
        catch (Exception ex)
        {
            setStatus("Filewatcher konnte nicht initialisiert werden: " + ex.Message, Level.ERROR);
        }
    }

通过此呼叫：

   private void OnChangedActive(object source, FileSystemEventArgs e)
    {
        try
        {
            switch (e.ChangeType)
            {
                case WatcherChangeTypes.Created: break;
                case WatcherChangeTypes.Deleted:

                    break;
                default:
                    break;
            }   
        }
        catch (Exception ex)
        {
            this.Dispatcher.BeginInvoke(new Action(() => setStatus(ex.Message, Level.ERROR)));
        }
    }

如果我在windows资源管理器中添加或删除文件，一切都很好。但在我的场景中，另一个.net程序添加了带有以下代码的文件：

public static void add(String path, MachineOrder machineOrder, String fileExtention)
    {
        String filePath = path;
        StringBuilder stringBuilder = new StringBuilder();
        stringBuilder.AppendLine("Auftragsnummer;" + machineOrder.Ordernumber);
        stringBuilder.AppendLine("Positionsnummer;" + machineOrder.Positionnumber);
        stringBuilder.AppendLine("Aenderungsdatum;" + machineOrder.Editdate.ToString("yyyy-MM-dd hh:mm:ss"));
        stringBuilder.AppendLine("Menge;" + machineOrder.Amount.ToString());
        stringBuilder.AppendLine("Menge fertig;" + machineOrder.AmountReady.ToString());
        stringBuilder.AppendLine("Termin;" + machineOrder.Deliverydate.ToString("yyyy-MM-dd"));
        stringBuilder.AppendLine("Kundennummer;" + machineOrder.Customernumber);
        stringBuilder.AppendLine("Kundenname;" + machineOrder.Customername);
        stringBuilder.AppendLine("Kdauf.-nummer;" + machineOrder.CustomerOrdernumber);
        stringBuilder.AppendLine("Kdauf.-positionsnummer;" + machineOrder.CustomerOrdernumber);
        stringBuilder.AppendLine("Modell;" + machineOrder.Modell);

        foreach (KeyValuePair<String, string> characteristic in machineOrder.Charakteristics)
        {
            stringBuilder.AppendLine(characteristic.Key + ";" + characteristic.Value);
        }

        String filename = FilenameBuilder.buildFilename(machineOrder, fileExtention);
        filePath = filePath + "''" + filename;
        System.IO.File.WriteAllText(filePath, stringBuilder.ToString());
    }

现在文件观察者跳转到创建、删除、创建、删除等等。我不知道为什么

有什么想法吗？