/// <summary>
        /// 添加仪器
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private async void NewBtn_ClickAsync(object sender, RoutedEventArgs e)
        {
            //创建创建仪器对话框
            var dialog3 = new InputDialog3();

            dialog3.Model().Label1           = "Instrument Name";
            dialog3.Model().Label3           = "Communication Type";
            dialog3.Model().ItemsSource      = new ObservableCollection <ComboBoxItemModel>(SystemSettings.Comm1);
            dialog3.Model().Input1           = "";
            dialog3.Model().WarningMsg1      = "Input not available!";
            dialog3.Model().Input1Validation = (
                s =>
            {
                return(!SystemSettings.InstrumentsList.Any(t => t.Name.ToUpper() == s.ToUpper()));
            });
Input:
            var result = await DialogHost.Show(dialog3, "RootDialog", new DialogClosingEventHandler((s, t) => { }));

            if ((bool)result)
            {
                var typeStr = ((ComboBoxItemModel)dialog3.Model().Input3).Name;
                var type    = (CommunicationType)Enum.Parse(typeof(CommunicationType), typeStr);

                //仪器通讯类型错误则返回重新选择类型
                if (type == CommunicationType.None)
                {
                    await this.MsgBox("Please select the correct communication type.");

                    goto Input;
                }

                var instr = new InstrumentModel()
                {
                    Name               = dialog3.Model().Input1,
                    Description        = dialog3.Model().Input1,
                    CommnunicationType = type,
                    Config             = CommunicationBase.CreateCfg(type),
                    CommReference      = CommunicationBase.CreateCommunication(type)
                };
                //添加仪器至全局变量
                SystemSettings.InstrumentsList.Add(instr);
                //选中当前添加的仪器
                Instruments.SelectedItem = instr;
            }
        }