mshtml与System.Windows.Forms.HtmlElement

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#webbrowser #object #javascript #string #null #input

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本文介绍了如何利用MSHTML接口与System.Windows.Forms.HtmlElement来操作WebBrowser控件，包括打开网页、操作HTML元素、点击按钮、获取属性值以及执行JavaScript。示例代码详细展示了如何与网页元素交互，如设置表单字段、调用JS函数以及禁用JavaScript错误显示。

(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();