public partial class WebTest: Window{   private void Window_ContentRendered(object sender, EventArgs e)   {     this.wbrExam.ObjectForScripting = new OprateBasic(this);     this.wbrExam.Source = new Uri(Environment.CurrentDirectory + @"\res\template.html");   }      public void Wtest(string str)   {        MessageBox.Show(str);   }}[System.Runtime.InteropServices.ComVisible(true)]public class OprateBasic{    private WebTest instance;    public OprateBasic(WebTest instance)    {       this.instance = instance;    }        public void HandleTest(string p)    {        instance.Wtest(p);    }}