How can I get an HtmlElementCollection from a WPF WebBrowser

问题

My old WinForm application used HtmlElementCollection to process a page

HtmlElementCollection hec = this.webbrowser.Document.GetElementsByTagName("input");

In WPF WebBrowser, there are several things that are different. For example

this.webbrowser.Document does not have any method called GetElementsByTagName

Therefore my code is unable to get an HtmlElementCollection

回答1:

You need to add reference to Microsoft.mshtml and then you need to cast document as mshtml.HTMLDocument. After you do that you should be able to use getElementsByTagName() method

 var document = webBrowser.Document as mshtml.HTMLDocument;
 var inputs = document.getElementsByTagName("input");
 foreach (mshtml.IHTMLElement element in inputs)
 {

 }

getElementsByTagName() returns mshtml.IHTMLElementCollection and each item is of a mshtml.IHTMLElement type

EDIT

Alternative solution, if you need to use WinForms WebBrowser you can use that instead of the WPF one. Add reference to WindowsFormsIntegration and System.Windows.Forms, create namespace in XAML and use different browser control

<Window ...
    xmlns:winforms="clr-namespace:System.Windows.Forms;assembly=System.Windows.Forms">
    <WindowsFormsHost>
        <winforms:WebBrowser x:Name="webBrowser"/>
    </WindowsFormsHost>
</Window>

来源：https://stackoverflow.com/questions/29972874/how-can-i-get-an-htmlelementcollection-from-a-wpf-webbrowser