Adroit.Gui.PlanningView.OnAddAttachmentButtonClicked C# (CSharp) Method

        protected virtual void OnAddAttachmentButtonClicked(object sender, System.EventArgs e)
        {
            var task = SelectedTask;

            if (task == null)
                return;

            var dialog = new FileChooserDialog (Catalog.GetString ("Add Attachment"),
                                                (Gtk.Window)this.Toplevel,
                                                FileChooserAction.Open,
                                                Gtk.Stock.Cancel, Gtk.ResponseType.Cancel,
                                                Gtk.Stock.Ok, Gtk.ResponseType.Ok);
            int response = dialog.Run ();

            List<string> filenames = new List<string> ();

            if (response == (int)Gtk.ResponseType.Ok) {
                if (task.Attachments != null)
                    filenames.AddRange (task.Attachments);
                filenames.AddRange (dialog.Filenames);

                var command = new EditTaskCommand () {
                    Storage = m_storage,
                    Task = task,
                    Property = "Attachments",
                    Value = filenames.ToArray ()
                };

                command.Done += delegate {
                    this.UpdateAttachments ();
                };

                command.Undone += delegate {
                    this.UpdateAttachments ();
                };

                var commands = ServiceManager.Get<CommandService> ().Commands;
                commands.Do (command);
            }

            dialog.Destroy ();
        }