所以我在c#中创建了BHO.在文档完成事件中

private void webBrowser_DocumentComplete(object pDisp,ref object URL)
    {
        // this is main docuemnt
        document = (HTMLDocument)webBrowser.Document;

        //-------------------------------------------------------------------------------------

        IHTMLElementCollection elcol = document.getElementsByTagName("iframe");
        foreach (IHTMLElement _htmlElement in elcol)
        {
            try
            {
                //This line is for specific iframe on body
                //string fUrl = ((mshtml.HTMLIFrameClass)_htmlElement).IHTMLFrameBase_src;
                //if (fUrl.Contains("/v1/api/login?isIframe=true"))
                //{
                // in this casting HtmlElement HTMLFrameElement
                HTMLFrameElement frmelement = (HTMLFrameElement)_htmlElement;

                //from HTMLFrameElement Casting as a WebBrowser2 because it will give us body of i frame and works a document .
                DispHTMLDocument doc2 = (DispHTMLDocument)((SHDocVw.IWebBrowser2)frmelement).Document;

                //no Doc2 is documnt without access denied .. do what ever you want to do

                //Here i am checking wheather document having body or not
                if (doc2.body != null)
                {
                    //Here i am checking Already injected or not if not then inject my javascript here
                    if (doc2.getElementById("UniqueDivVishal") == null)
                    {
                        IHTMLElement head = (IHTMLElement)((IHTMLElementCollection)doc2.all.tags("head")).item(null,0);
                        IHTMLScriptElement scriptObject = (IHTMLScriptElement)doc2.createElement("script");
                        scriptObject.type = @"text/javascript";
                        scriptObject.text = Properties.Resources.SearchHelper1;
                        ((HTMLHeadElement)head).appendChild((IHTMLDOMNode)scriptObject);

                        string div2 = "<div id=\"UniqueDivVishal\"></div>";
                        doc2.body.insertAdjacentHTML("beforeend",div2);
                    }

                    //execute a function from BHO which is in Iframe
                    doc2.parentWindow.execScript("funcation(){ InitFn(); alert('Hello From Frame')}","javascript");

                }
                //}
            }
            catch (Exception ex)
            {
               //Handle Exception here //                   
            }
        }
    }

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