webBrowser和Js的交互如何实现js服务端调用

WPF,js调用服务端和服务端调用js单独调用都可以，但是把这2个单独的流程连起来的时候就出错了，服务端调用CS出错了， 错误提示“未知名称”
  代码可能写的有问题，请大家帮忙看下。

public partial class WebBrowserWindow : Window
    {
        public Action webHandler;
        public Boolean isMove = false;
        public WebBrowserWindow()
        {
            InitializeComponent();
            this.webBrowser.ObjectForScripting = new ScriptObject(this);
            this.webBrowser.LoadCompleted += new System.Windows.Navigation.LoadCompletedEventHandler(webBrowser_LoadCompleted);
            //Console.WriteLine("webBrowser"+webBrowser.Ver)
            this.webBrowser.Navigate("file:///C:\test.html");

        }


        void webBrowser_LoadCompleted(object sender, System.Windows.Navigation.NavigationEventArgs e)
        {
            if (this.webHandler != null)
            {
                this.webHandler();
                this.webHandler = null;
            }
        }
        //单独调用可以
        private void btn2_Click(object sender, RoutedEventArgs e)
        {
            this.webBrowser.InvokeScript("showmsg", new object[] { "{"center":{"lng":12.232,"lat":13.232},"zoom":14}", "{"center2":{"lng":12.232,"lat":13.232},"zoom":14}" });
        }

        public  void toClient(string type)
        {
            try
            {
                webBrowser.InvokeScript("showmsg", new object[] { "{"center":{"lng":12.232,"lat":13.232},"zoom":14}" });
            }
            catch (Exception e)
            {
                Console.WriteLine("Error" + e.Message);//提示错误未知名称
            }
        }

       

        

         [ComVisible(true)]
          public class ScriptObject
          {
              private Window instance;
              public ScriptObject(Window instance)
              {
                  this.instance = instance;
              }

              public void doSomething(string msg)
              {
                  MessageBox.Show(msg, "receive from", MessageBoxButton.OK, MessageBoxImage.Information);
                  WebBrowserWindow window = new WebBrowserWindow();
                  window.toClient(""); // 是不是外部调用有问题？
                  Console.WriteLine("end.....");
              }
          }
    }

页面JS：

<script type="text/javascript">
 (function (window) {
				var searcher = {
					showmsg: function (msg1) {
						alert("msg1:"+msg1);

					} 
				};
				window.searcher = searcher;
			})(window);

        function showmsg(msg1) {
            searcher.showmsg(msg1);
        }
		function invekeServer(traits){
			window.external.doSomething("");
			return false;
		}
	</script>