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Asked: 2026-05-30T19:00:08+00:00

Knowing that I can’t use HTMLAgilityPack, only straight .NET, say I have a string

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Knowing that I can’t use HTMLAgilityPack, only straight .NET, say I have a string that contains some HTML that I need to parse and edit in such ways:

  • find specific controls in the hierarchy by id or by tag
  • modify (and ideally create) attributes of those found elements

Are there methods available in .net to do so?

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1 Answer

  1. Editorial Team

    HtmlDocument

    GetElementById

    HtmlElement

    You can create a dummy html document.

    WebBrowser w = new WebBrowser();
w.Navigate(String.Empty);
HtmlDocument doc = w.Document;
doc.Write("<html><head></head><body><img id=\"myImage\" src=\"c:\"/><a id=\"myLink\" href=\"myUrl\"/></body></html>");
Console.WriteLine(doc.Body.Children.Count);
Console.WriteLine(doc.GetElementById("myImage").GetAttribute("src"));
Console.WriteLine(doc.GetElementById("myLink").GetAttribute("href"));
Console.ReadKey();

    Output:

    2

    file:///c:

    about:myUrl

    Editing elements:

    HtmlElement imageElement = doc.GetElementById("myImage");
string newSource = "d:";
imageElement.OuterHtml = imageElement.OuterHtml.Replace(
        "src=\"c:\"",
        "src=\"" + newSource + "\"");
Console.WriteLine(doc.GetElementById("myImage").GetAttribute("src"));

    Output:

    file:///d:

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