webbrowser 怎么执行带参数的JS函数

webbrowser 如何执行带参数的JS函数？
模拟执行下面这个JS，selectSaCode(this)无效呢 

<TD class=recordContent>&nbsp;<SELECT onchange=selectSaCode(this) name=saCode> <OPTION selected value=default>请选择</OPTION> <OPTION value=f650001>f650001</OPTION></SELECT> </TD>

  

 public override bool webLogin(IHTMLDocument2 htmlElement)
        {
 all = htmlElement.all;
                            HTMLSelectElement daili = null; ;
                            foreach (IHTMLElement e in all)
                            {
 if (e is HTMLSelectElementClass)
                                    {
                                       daili = (HTMLSelectElement)e;
                                       if (daili.outerHTML.IndexOf("selectSaCode(this)") > 0)
                                        daili.selectedIndex = 2;
                                    }
                                    else if (e is HTMLOptionElementClass)
                                    { 
 
  HTMLOptionElement option = (HTMLOptionElement)e;


                                        if (option.outerHTML.ToLower().IndexOf("f650001") > 0)
                                        {
                                            option.selected = true;

                                            this.WebBrowser.Document.InvokeScript("selectSaCode", new object[] { daili});
//没有效果呢
//( (IHTMLDocument2)this.WebBrowser.Document.DomDocument).parentWindow.execScript("selectSaCode(this);");//习惯用这个，好像这个无法执行带参数的JS函数量
                                            Thread.Sleep(1000);
                                        }
}
}
}

                             
[解决办法]
daili.FireEvent("onchange");

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