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 = 0; 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";
                                    }
                                }
                            }
                        }
                    }
                }
            }