PRB: WebBrowser Problems When Refreshing in TitleChange Handler (179229)


The information in this article applies to:

  • Microsoft Internet Explorer (Programming) 3.02
  • Microsoft Internet Explorer (Programming) 4.0
  • Microsoft Internet Explorer (Programming) 4.01
  • Microsoft ActiveX SDK
  • Microsoft Internet Client SDK 4.0
  • Microsoft Internet Client SDK 4.01
This article was previously published under Q179229

SYMPTOMS

When an application using the WebBrowser control makes a call to the Refresh method of the WebBrowser control in an event handler for the TitleChange event, various problems occur.

Internet Explorer 3.02 crashes with an access violation. In the other versions of Internet Explorer mentioned at the beginning of this article, an infinite loop occurs and the browser hangs.

CAUSE

In Internet Explorer 4.x this behavior is by design. Calling Refresh from within a TitleChange event handler causes the WebBrowser control to fire a TitleChange event. This infinite loop occurs if you call Refresh in handlers for many of the WebBrowser events.

RESOLUTION

Do not call Refresh within the TitleChange event handler for the WebBrowser.

STATUS

This behavior is by design.

MORE INFORMATION

Steps to Reproduce Behavior

  1. In Visual Basic, drop a WebBrowser control on a form.
  2. Add a button.
  3. Add the following code to the click event handler for the button: 
    WebBrowser1.Navigate "http://www.microsoft.com"
  4. Add the following code to the WebBrowser's TitleChange event handler: 
    Webbrowser1.Refresh
  5. Run the project, and click the button.
  6. In Internet Explorer 3.02 the application will crash. In the other versions of Internet Explorer mentioned at the beginning of the article, an infinite loop occurs.
Modification Type:MinorLast Reviewed:8/18/2005
Keywords:kbprb KB179229
©2004 Microsoft Corporation. All rights reserved.