Amoeba.Windows.ShareControl._listView_PreviewDrop C# (CSharp) Method

        private void _listView_PreviewDrop(object sender, DragEventArgs e)
        {
            if (!e.Data.GetDataPresent(DataFormats.FileDrop)) return;
            var result = ((string[])e.Data.GetData(DataFormats.FileDrop)).ToList();

            Task.Run(() =>
            {
                if (_shareAddIsRunning) return;
                _shareAddIsRunning = true;

                Thread.CurrentThread.IsBackground = true;

                try
                {
                    var filePaths = new HashSet<string>();

                    foreach (var item in result)
                    {
                        if (File.Exists(item)) filePaths.Add(item);
                        else if (Directory.Exists(item)) filePaths.UnionWith(Directory.GetFiles(item, "*", SearchOption.AllDirectories));
                    }

                    foreach (var informaiton in _amoebaManager.ShareInformation)
                    {
                        filePaths.Remove((string)informaiton["Path"]);
                    }

                    this.Dispatcher.Invoke(DispatcherPriority.Background, new Action(() =>
                    {
                        if (filePaths.Count == 1)
                        {
                            var window = new UploadWindow(filePaths.First(), true, _amoebaManager);
                            window.Owner = _mainWindow;
                            window.ShowDialog();
                        }
                        else if (filePaths.Count > 1)
                        {
                            var window = new UploadListWindow(filePaths, true, _amoebaManager);
                            window.Owner = _mainWindow;
                            window.ShowDialog();
                        }
                    }));
                }
                finally
                {
                    _shareAddIsRunning = false;
                }
            });
        }