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How to: Access the HTML Source in the Managed HTML Document Object Model

The DocumentStream and DocumentText properties on the WebBrowser control return the HTML of the current document as it existed when it was first displayed. However, if you modify the page using method and property calls such as AppendChild and InnerHtml, these changes will not appear when you call DocumentStream and DocumentText. To obtain the most up-to-date HTML source for the DOM, you must call the OuterHtml property on the HTML element.

The following procedure shows how to retrieve the dynamic source and display it in a separate shortcut menu.

Retrieving the dynamic source with the OuterHtml property

  1. Create a new Windows Forms application. Start with a single Form, and call it Form1.

  2. Host the WebBrowser control in your Windows Forms application, and name it WebBrowser1. For more information, see How to: Add Web Browser Capabilities to a Windows Forms Application.

  3. Create a second Form in your application called CodeForm.

  4. Add a RichTextBox control to CodeForm and set its Dock property to Fill.

  5. Create a public property on CodeForm called Code.

    public string Code
    {
        get
        {
            if (richTextBox1.Text != null)
            {
                return (richTextBox1.Text);
            }
            else
            {
                return ("");
            }
        }
        set
        {
            richTextBox1.Text = value;
        }
    }
    
    
  6. Add a Button control named Button1 to your Form, and monitor for the Click event. For details on monitoring events, see Consuming Events.

  7. Add the following code to the Click event handler.

    private void button1_Click(object sender, EventArgs e)
    {
        HtmlElement elem;
    
        if (webBrowser1.Document != null)
        {
            CodeForm cf = new CodeForm();
            HtmlElementCollection elems = webBrowser1.Document.GetElementsByTagName("HTML");
            if (elems.Count == 1)
            {
                elem = elems[0];
                cf.Code = elem.OuterHtml;
                cf.Show();
            }
        }
    }
    
    

Robust Programming

Always test the value of Document before attempting to retrieve it. If the current page is not finished loading, Document or one or more of its child objects may not be initialized.

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