/// <summary> /// 在线发送 /// </summary> private void OnlineSend() { if (ChatViewModel != null) { _targetModel.CanOperate = false; AcioningItems.Remove(this); if (_operateTask != null) { _operateTask.Cancel(); _operateTask = null; } if (FileExists()) { AcioningItems.Add(this); _operateTask = new System.Threading.CancellationTokenSource(); if (ChatViewModel.IsGroup) { this.tbConnecting.Visibility = Visibility.Visible; //群聊只能离线发送 ChatViewModel.SendOfflineFile(_targetModel, _operateTask, (result) => { AcioningItems.Remove(this); if (_operateTask != null) { _operateTask.Cancel(); _operateTask = null; } }); } else { ChatViewModel.SendOnlineFile(ChatViewModel, _targetModel, _operateTask, (result) => { AcioningItems.Remove(this); if (_operateTask != null) { _operateTask.Cancel(); _operateTask = null; } }); } } else { ChatViewModel.Chat.Messages.Remove(_targetModel); } } }