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Asked: 2026-06-08T01:06:34+00:00

I have a WebBrowser document set to be in edit mode. I am trying

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I have a WebBrowser document set to be in edit mode. I am trying to manipulate the inner text of the body element by using WebBrowser.Document.Body.InnerText, however, WebBrowser.Document.Body remains null.

Here is the code where I create the document contents:

private WebBrowser HtmlEditor = new WebBrowser();
public HtmlEditControl()
{
    InitializeComponent();
    HtmlEditor.DocumentText = "<html><body></body></html>";
    myDoc = (IHTMLDocument2)HtmlEditor.Document.DomDocument;
    myDoc.designMode = "On";
    HtmlEditor.Refresh(WebBrowserRefreshOption.Completely);
    myContentsChanged = false;
}

I can edit code and everything fine, but I don’t understand why HtmlEditor.Document.Body remains null. I know I could always just reset the document body whenever I need to load text into the form, but I would prefer to understand why this is behaving the way it is, if nothing else then for the knowledge.

Any help on this is greatly appreciated.

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1 Answer

  1. Editorial Team

    You have to wait for the Web Browser’s DocumentCompleted event to fire for the DomDocument.Body to not be null. I just tested this to verify. I suppose the question still remains: how are you able to edit through the underlying COM interface when the document has not completely loaded?

    I checked to see if the IHTMLDocument2 pointers were the same in DocumentCompleted and the constructor. They are, which might indicate that the underlying COM object reuses a single HTML document object. It seems like any changes you make in the constructor at least have a pretty good chance of getting overwritten or throwing an exception.

    For example, if I do this in the constructor, I get an error:

    IHTMLDocument2 p1 = (IHTMLDocument2) HTMLEditor.Document.DomDocument;

p1.title = "Hello world!";

    If I do the same in a DocumentCompleted handler, it works fine.

    Hope this helps. Thanks.

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