HtmlWindowCollection Class


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Represents the windows contained within another HtmlWindow.

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


public class HtmlWindowCollection : ICollection, IEnumerable


Gets the number of elements in the collection.


Retrieves a frame window by supplying the frame's position in the collection.


Retrieves a frame window by supplying the frame's name.


Determines whether the specified object is equal to the current object.(Inherited from Object.)


Allows an object to try to free resources and perform other cleanup operations before it is reclaimed by garbage collection.(Inherited from Object.)


Returns an enumerator that can iterate through all elements in the HtmlWindowCollection.


Serves as the default hash function. (Inherited from Object.)


Gets the Type of the current instance.(Inherited from Object.)


Creates a shallow copy of the current Object.(Inherited from Object.)


Returns a string that represents the current object.(Inherited from Object.)

System_CAPS_pubinterfaceSystem_CAPS_privmethodICollection.CopyTo(Array, Int32)

This API supports the product infrastructure and is not intended to be used directly from your code. Copies the elements of the collection to an Array, starting at a particular Array index.


This API supports the product infrastructure and is not intended to be used directly from your code. Gets a value indicating whether access to the collection is synchronized (thread safe).


This API supports the product infrastructure and is not intended to be used directly from your code. Gets an object that can be used to synchronize access to the collection.


Overloaded. Enables parallelization of a query.(Defined by ParallelEnumerable.)


Overloaded. Converts an IEnumerable to an IQueryable.(Defined by Queryable.)


Casts the elements of an IEnumerable to the specified type.(Defined by Enumerable.)


Filters the elements of an IEnumerable based on a specified type.(Defined by Enumerable.)

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");

.NET Framework
Available since 2.0

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

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