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HtmlWindowCollection Class

Represents the windows contained within another HtmlWindow.

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

'Declaration
Public Class HtmlWindowCollection _
	Implements ICollection, IEnumerable
'Usage
Dim instance As HtmlWindowCollection

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.

Dim LinksTable As Hashtable

Private Sub GetLinksFromFrames()
    LinksTable = New Hashtable()
    Dim FrameUrl As String 

    If (WebBrowser1.Document IsNot Nothing) Then 
        With WebBrowser1.Document
            Dim CurrentWindow As HtmlWindow = .Window
            If (CurrentWindow.Frames.Count > 0) Then 
                For Each Frame As HtmlWindow In CurrentWindow.Frames
                    FrameUrl = Frame.Url.ToString()
                    Dim FrameLinksHash As New Hashtable()
                    LinksTable.Add(FrameUrl, FrameLinksHash)

                    For Each HrefElement As HtmlElement In Frame.Document.Links
                        FrameLinksHash.Add(HrefElement.GetAttribute("HREF"), "Url")
                    Next 
                Next 
            Else 
                Dim DocLinksHash As New Hashtable()
                LinksTable.Add(.Url.ToString(), DocLinksHash)

                For Each HrefElement As HtmlElement In .Links
                    DocLinksHash.Add(HrefElement.GetAttribute("HREF"), "Url")
                Next 
            End If 
        End With 
    End If 
End Sub

System.Object
  System.Windows.Forms.HtmlWindowCollection

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 7, Windows Vista, Windows XP SP2, Windows XP Media Center Edition, Windows XP Professional x64 Edition, Windows XP Starter Edition, Windows Server 2008 R2, Windows Server 2008, Windows Server 2003, Windows Server 2000 SP4, Windows Millennium Edition, Windows 98

The .NET Framework and .NET Compact Framework do not support all versions of every platform. For a list of the supported versions, see .NET Framework System Requirements.

.NET Framework

Supported in: 3.5, 3.0, 2.0

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