[Mono-bugs] [Bug 445457] New: WebBrowser: Setting ScrollBarsEnabled crashes mono

[bugzilla_noreply at novell.com]

https://bugzilla.novell.com/show_bug.cgi?id=445457


           Summary: WebBrowser: Setting ScrollBarsEnabled crashes mono
           Product: Mono: Class Libraries
           Version: 2.0
          Platform: Other
        OS/Version: Windows Vista
            Status: NEW
          Severity: Normal
          Priority: P5 - None
         Component: Windows.Forms
        AssignedTo: mono-bugs at lists.ximian.com
        ReportedBy: apper at apper.de
         QAContact: mono-bugs at lists.ximian.com
          Found By: ---


Created an attachment (id=252486)
 --> (https://bugzilla.novell.com/attachment.cgi?id=252486)
Test case

When setting the ScrollBarsEnabled property, my Mono 2.0.1 using windows
crashes without any message. 

The Mono WebBrowser.cs uses Document.InvokeScript() to set this property, so
the problem must be somewhere at this point. Using this directly results in the
same behavior, of course. But this is no surprise: the Document property of the
WebBrowser element is initially null, so calling InvokeScript() gets a
NullReferenceException even using MS.NET, as long as there is no page loaded
(which is the normal case, when setting a property like ScrollBarsEnabled).

Besides fixing the ScrollBarsEnabled setter, it should be evaluated, why Mono
crashes (without an error message) when accessing the Document property of a
WebBrowser element, where this is null.

The test case is a simple C# example, which creates a window with a webbrowser
and sets the ScrollBarsEnabled property, which results in a crash using Windows
Vista and Mono 2.0.1.


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