How to use WebBrowser control DocumentCompleted event in C#?

Question

Before starting writing this question, i was trying to solve following

// 1. navigate to page
// 2. wait until page is downloaded
// 3. read and write some d         


        

Answer 1

Just thought to drop a line or two here about a small improvement which works in conjunction with the code of FeiBao. The idea is to inject a landmark (javascript) variable in the webpage and use that to detect which of the subsequent DocumentComplete events is the real deal. I doubt it's bulletproof but it has worked more reliably in general than the approach that lacks it. Any comments welcome. Here is the boilerplate code:

 void WebBrowser_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
    {
        string url = e.Url.ToString();
        var browser = (WebBrowser)sender;

        if (!(url.StartsWith("http://") || url.StartsWith("https://")))
        {
            // in AJAX     
        }
        if (e.Url.AbsolutePath != this.webBrowser.Url.AbsolutePath)
        {
            // IFRAME           
        }
        else if (browser.Document != null && (bool)browser.Document.InvokeScript("eval", new object[] { @"typeof window.YourLandMarkJavascriptVariableHere === 'undefined'" }))
        {
            ((IHTMLWindow2)browser.Document.Window.DomWindow).execScript("var window.YourLandMarkJavascriptVariableHere = true;");

            // REAL DOCUMENT COMPLETE
            // Put my code here
        }
    }