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HtmlWindowCollection Class

Represents the windows contained within another HtmlWindow.

Namespace: System.Windows.Forms
Assembly: System.Windows.Forms (in

public class HtmlWindowCollection : ICollection, IEnumerable
public class HtmlWindowCollection implements ICollection, IEnumerable
public class HtmlWindowCollection implements ICollection, IEnumerable
Not applicable.

An HTML document may consist of a FRAMESET that defines multiple fixed FRAME objects, each of which contains its own HTML page. Alternatively, a document may contain a number of IFRAME objects, which can position documents arbitrarily inside of other documents. FRAME objects and IFRAME objects are represented at their top-most level by an HtmlWindowCollection, which contains elements of type HtmlWindow.

HtmlWindowCollection supports the IEnumerator interface so that it can be used in loop constructs. It also defines an Item method, which allows access to the elements of the collection either via a method call or using standard array syntax.

If you create new windows with the Open or OpenNew methods, and the documents hosted by these windows contain FRAME or IFRAME elements, that these elements will appear in the HtmlWindowCollection of the parent page.

For more information on frames, see the documentation for the Frames property.

The following code example inspects each document within a page containing frames and creates a table of all of the outgoing hyperlinks from each page for future inspection.

private void GetLinksFromFrames()
    Hashtable linksTable = new Hashtable();
    string frameUrl;

    if (!(webBrowser1.Document == null))
        HtmlWindow currentWindow = webBrowser1.Document.Window;
        if (currentWindow.Frames.Count > 0)
            foreach (HtmlWindow frame in currentWindow.Frames)
                frameUrl = frame.Url.ToString();
                Hashtable frameLinksHash = new Hashtable();

                linksTable.Add(frameUrl, frameLinksHash);
                foreach (HtmlElement hrefElement in frame.Document.Links)
                    frameLinksHash.Add(hrefElement.GetAttribute("HREF"), "Url");
            Hashtable docLinksHash = new Hashtable();
            linksTable.Add(webBrowser1.Document.Url.ToString(), docLinksHash);

            foreach (HtmlElement hrefElement in webBrowser1.Document.Links)
                docLinksHash.Add(hrefElement.GetAttribute("HREF"), "Url");


Any public static (Shared in Visual Basic) members of this type are thread safe. Any instance members are not guaranteed to be thread safe.

Windows 98, Windows Server 2000 SP4, Windows CE, Windows Millennium Edition, Windows Mobile for Pocket PC, Windows Mobile for Smartphone, Windows Server 2003, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP SP2, Windows XP Starter Edition

The Microsoft .NET Framework 3.0 is supported on Windows Vista, Microsoft Windows XP SP2, and Windows Server 2003 SP1.

.NET Framework

Supported in: 3.0, 2.0

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