C#程序 给IE网页IFRAME控件中所嵌入网页的元素赋值

//引用COM组件
//Microsoft HTML Object Library
//Microsoft Internet Controls

SHDocVw.ShellWindows shellWindows = new SHDocVw.ShellWindowsClass();
             string filename;
             foreach (SHDocVw.InternetExplorer ie in shellWindows)
             {
                 filename = Path.GetFileNameWithoutExtension(ie.FullName).ToLower();
                 if (filename.Equals("iexplore"))
                 {
                     SetText(string.Format("Web Site　 : {0}", ie.LocationURL));
                     mshtml.IHTMLDocument2 htmlDoc = ie.Document as mshtml.IHTMLDocument2;
                     SetText(string.Format("　 Document Snippet: {0}",
                     ((htmlDoc != null) ? htmlDoc.body.outerHTML
                     : "***Failed***")));
                     SetText(string.Format("{0}{0}", Environment.NewLine));

                     mshtml.HTMLInputElementClass input;
                     mshtml.HTMLIFrameClass iframe;
                     mshtml.IHTMLDocument2 target;
                     //获取父页面框架集合.
                     mshtml.IHTMLFramesCollection2 frames = htmlDoc.frames;
                     for (int i = ; i < frames.length; i++)
                     {
                         object index = i;
                         mshtml.IHTMLWindow2 frame = frames.item(ref index) as mshtml.IHTMLWindow2;

                         mshtml.IHTMLDocument2 frameDoc = frame.document as mshtml.IHTMLDocument2;
                         //现在你可以通过frameDoc获取子页面控件.

                         if (frame.location.href.Contains("zzs_fp.html"))
                         {
                             target = frameDoc;

                             foreach (mshtml.IHTMLElement ieElement in target.all)
                             {
                                 if (ieElement.tagName.ToUpper().Equals("INPUT"))
                                 {
                                     input = ((mshtml.HTMLInputElementClass)ieElement);

                                     SetText("input.name:" + input.name);
                                     SetText(string.Format("{0}{0}", Environment.NewLine));

                                     if (input.name == "ghdwmc")
                                     {
                                         input.value = "****";
                                     }
                                     else if (input.name == "ghdwsh")
                                     {
                                         input.value = "12300000747150428A";
                                     }
                                     else if (input.name == "ghdwdzdh")
                                     {
                                         input.value = "北京市 010-512011";
                                     }
                                     else if (input.name == "ghdwyhzh")
                                     {
                                         input.value = "北京银行 132465798798";
                                     }
                                 }
                             }
                         }
                     }
                 }
             }