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Editorial Team
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Asked: 2026-05-29T11:07:34+00:00

I have this simple project to grab HTML element inner data. This is a

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I have this simple project to grab HTML element inner data. This is a DLL Project.

 public class WebGrabber
    {
        public string URL { set; get; }

        public string Element { set; get; }

        public bool FindByID { set; get; }

        private WebBrowser b { set; get; }

        private mshtml.IHTMLDocument2 doc { set; get; }

        public void GetPageElementInnerHTML(string url, string element, bool findById)
        {
            URL = url;
            Element = element;
            FindByID = findById;

            b = new WebBrowser();
            b.Navigate(url);
            b.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(b_DocumentCompleted);
        }

        void b_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            doc = (IHTMLDocument2)b.Document.DomDocument;

            string result = "<html>";

            IHTMLElement head = (IHTMLElement)((IHTMLElementCollection)doc.all.tags("head")).item(null, 0);

            result += "<head>" + head.innerHTML + "</head>";

            if (null != doc)
            {
                foreach (IHTMLElement element in doc.all)
                {
                    if (element is mshtml.IHTMLDivElement)
                    {
                        dynamic div = element as HTMLDivElement;   

                        if (FindByID)
                        {
                            string id = div.id;

                            if (id == Element)
                            {
                                result += "<body>" + div.IHTMLElement_innerHTML + "</body></html>";

                                break;
                            }
                        }
                        else
                        {
                            string className = div.className;

                            if (className == Element)
                            {
                                result += "<body>" + div.IHTMLElement_innerHTML + "</body></html>";

                                break;
                            }
                        }
                    }
                }
            }
            doc.close();      
        }
    }

What I need is to implement access to string result variable.

So it could be possible to get asynchronously this variable from other project.

Perhaps I need some GetResult(); method?….

How I can do it?

Thank you!

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1 Answer

  1. Editorial Team

    You can pass the eventhandler as an argument then work with the result in the app no in the class library o just pass a callback and invoke after download is complete.

    I’m new here so i hope i did understand what you wanted.

    Passing the evnthandler

    public void GetPageElementInnerHTML(string url, string element, bool findById, WebBrowserDocumentCompletedEventHandler downloadComplete)

    Using a delegate:

    public class WebGrabber
    {

            public string URL { set; get; }

        public string Element { set; get; }

        public bool FindByID { set; get; }

        private WebBrowser b { set; get; }

        private mshtml.IHTMLDocument2 doc { set; get; }

        public delegate void DownloadCompletedDelegate(string result);

        private DownloadCompletedDelegate _downloadedComplete;

        public void GetPageElementInnerHTML(string url, string element, bool findById, DownloadCompletedDelegate downloadComplete)
        {
            _downloadedComplete = downloadComplete;
            URL = url;
            Element = element;
            FindByID = findById;

            b = new WebBrowser();
            b.Navigate(url);
            b.DocumentCompleted += new WebBrowserDocumentCompletedEventHandler(b_DocumentCompleted);
        }

        void b_DocumentCompleted(object sender, WebBrowserDocumentCompletedEventArgs e)
        {
            doc = (IHTMLDocument2)b.Document.DomDocument;

            string result = "<html>";

            IHTMLElement head = (IHTMLElement)((IHTMLElementCollection)doc.all.tags("head")).item(null, 0);

            result += "<head>" + head.innerHTML + "</head>";

            if (null != doc)
            {
                foreach (IHTMLElement element in doc.all)
                {
                    if (element is mshtml.IHTMLDivElement)
                    {
                        dynamic div = element as HTMLDivElement;

                        if (FindByID)
                        {
                            string id = div.id;

                            if (id == Element)
                            {
                                result += "<body>" + div.IHTMLElement_innerHTML + "</body></html>";

                                break;
                            }
                        }
                        else
                        {
                            string className = div.className;

                            if (className == Element)
                            {
                                result += "<body>" + div.IHTMLElement_innerHTML + "</body></html>";

                                break;
                            }
                        }
                    }
                }
            }
            doc.close();

            _downloadedComplete.Invoke(result);
        }
    }

    In the APP

    GetPageElementInnerHTML(URL, element, true/false, CompletedCallback);

    private void CompletedCallback(string result)
    {
    //your code

    }

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