pass object as value C#

1k Views Asked by Computer User At 03 April 2025 at 06:21

I am passing an object: System.Windows.Forms.HtmlElement to a method when navigating WebBrowser object to a URL in C#, but if I navigate the WebBrowser object to another page, the HtmlElement object becomes null. The pseudo-code is:

//Code to navigate to a page
WebBrowser.Navigate("http://www.google.com");

//pass one of the page's element as parameter in a method
Method(HtmlElement WebBrowser.Document.Body.GetElementsByTagName("input")["search"]);

Method(HtmlElement Element)
{
  //Works fine till now
  MessageBox.Show(Element.InnerText);

  //Code to navigate to another page
  WebBrowser.Navigate("http://www.different_page.com");

  //Here the Element object throws exception because it becomes null after another navigation to another website.
  MessageBox.Show(Element.InnerText); 
}

Original Q&A

There are 2 best solutions below

Computer User On 18 November 2014 at 13:05 BEST ANSWER

I found a work around to the problem. The solution is to create a temporary WebBrowser object and pass the Element in it as OuterHtml directly into the body, and then navigate to that DOM text as if it was a response HTML of a page:

Method(HtmlElement Element)
{
  MessageBox.Show(Element.InnerText);

  WebBrowser WebBrowser = new WebBrowser();

  WebBrowser.DocumentText = "<html><head></head><body>" + Element.OuterHtml + "</body></html>";

  while (WebBrowserReadyState.Complete != WebBrowser.ReadyState)
            Application.DoEvents();

  MessageBox.Show(WebBrowser.Document.Body.InnerText);
}

Now I am able to access the Element as: WebBrowser.Document.BodyAnd it persists even if I navigate the original WebBrowser object to another page.

Con Kouroupis On 17 November 2014 at 11:27

Element is holding a reference, therefore it loses its state on the second navigation. Try storing value types (such as .InnerText) before executing the second navigation.

pass object as value C#

There are 2 best solutions below

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