Question

Since you can only assign it after the document have been loaded, and you don’t need to assign it every time a document loads, do I just don’t have other choice than to do something like this?

private void WebBrowser_DocumentCompleted(object sender,
    WebBrowserDocumentCompletedEventArgs e)
{
    if (!mouseDownAssigned) // mouseDownAssigned is a bool with start value false
    {
        mouseDownAssigned = true;
        this.Document.MouseDown += 
            new HtmlElementEventHandler(Document_MouseDown);
    }
}

Which is kinda ugly and not elegant. Got a feeling this is not what Microsoft had in mind.

Answer 1

I think this is the closest to an elegant solution:

    public MyWebBrowser()
    {
        InitializeComponent();
        this.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(SuperWebBrowser_DocumentCompleted);
        this.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(SuperWebBrowser_DocumentFirstCompleted);
    }

    private void SuperWebBrowser_DocumentFirstCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        this.DocumentCompleted -= new WebBrowserDocumentCompletedEventHandler(SuperWebBrowser_DocumentFirstCompleted);
        this.Document.MouseDown += new HtmlElementEventHandler(Document_MouseDown);
    }

    private void SuperWebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
    }

That way I don’t need to check a variable every time a document completes. Guess that’s kinda what Microsoft had in mind.