mshtml与System.Windows.Forms.HtmlElement

(1)打开并操作外部IE，这个只有MSHTML能做到：

打开ie：

SHDocVw.ShellWindows shellWindows = new SHDocVw.ShellWindowsClass();
object objFlags = 1;
object objTargetFrameName = "";
object objPostData = "";
object objHeaders = "";
SHDocVw.InternetExplorer webBrowser1= (SHDocVw.InternetExplorer)shellWindows.Item(shellWindows.Count-1);
webBrowser1.Navigate(“http://www.google.cn”, ref objFlags, ref objTargetFrameName, ref objPostData, ref objHeaders);

（2）如果里面有iframe，要给里面的text填充信息
 HtmlDocument main_formDoc = webBrowser1.Document;
                IHTMLDocument2 main_mshtmlIHTMLDoc = (IHTMLDocument2)main_formDoc.DomDocument;
                Object frame_index = 0;
                IHTMLWindow2 target_mshtmlIHTMLWindow = (IHTMLWindow2)main_mshtmlIHTMLDoc.frames.item(ref frame_index);
                IHTMLDocument2 target_mshtmlIHTMLDoc = CodecentrixSample.CrossFrameIE.GetDocumentFromWindow(target_mshtmlIHTMLWindow);
                HTMLDocument  doc = target_mshtmlIHTMLDoc as HTMLDocument;


                IHTMLElementCollection eCollection = doc.getElementsByTagName("input");
                foreach (IHTMLElement element in eCollection)
                {
                   if(element.getAttribute("name")=="username")
                       element.innerHTML = name.Trim();


                }

---------------------------------------------------------------------

HtmlElementCollection submits = webBrowser1.Document.GetElementsByTagName("select");
                    foreach (HtmlElement submit in submits)
                    {
                        if (submit.GetAttribute("name") == "typeid")
                        {


                            submit.SetAttribute("value", siteid);
                            //submit.InvokeMember("click");
                            break;
                        }
                    }

（3）要点击里面的某个按钮
mshtml.IHTMLDocument2 doc2=(mshtml.IHTMLDocument2)myWeb.Document;
mshtml.IHTMLElementCollection inputs;
inputs=(mshtml.IHTMLElementCollection)doc2.all.tags("INPUT");
mshtml.IHTMLElement element=(mshtml.IHTMLElement)inputs.item("SubmitBut",0);
element.click();

------------------------------------------------------

 HtmlElement loginsubmit = webBrowser1.Document.GetElementById("loginsubmit");
  loginsubmit.InvokeMember("click");

（4）根据元素ID获取元素的值。

比如要获取<img class="" id="regimg" src="/register/checkregcode.html?1287068791" width="80" height="22">这个标签里的src属性的值：

mshtml.IHTMLDocument2 doc2 = (mshtml.IHTMLDocument2)webBrowser1.Document;
mshtml.IHTMLElement img = (mshtml.IHTMLElement)doc2.all.item("regimg", 0);

string imgUrl = (string)img.getAttribute("src");

----------------------------------------------------------------

 HtmlElement regbimp1 = webBrowser1.Document.GetElementById("regimg");
string imgUrl = (string)img.getAttribute("src");

（5）执行JS

mshtml.IHTMLWindow2 win = (mshtml.IHTMLWindow2)doc2.parentWindow;
win.execScript("changeRegImg()", "javascript");//使用JS

-------------------------

  IHTMLWindow2 login = (mshtml.IHTMLWindow2)webBrowser1.Document.Window.DomWindow;
    login.execScript("updateseccode()", "javascript");

（6）、禁止JS，WPF下目前发现唯一适用的一种方法：

public void HideScriptErrors(WebBrowser wb, bool Hide)
   {

    FieldInfo fiComWebBrowser = typeof(WebBrowser).GetField("_axIWebBrowser2", BindingFlags.Instance | BindingFlags.NonPublic);

    if (fiComWebBrowser == null) return;

    object objComWebBrowser = fiComWebBrowser.GetValue(wb);

    if (objComWebBrowser == null) return;

    objComWebBrowser.GetType().InvokeMember(

    "Silent", BindingFlags.SetProperty, null, objComWebBrowser, new object[] { Hide });

   }

   void webBrowser1_Navigated(object sender, NavigationEventArgs e)
   {

    HideScriptErrors(webBrowser1,

    true);

   }