IE8 Beta1 breaks WPF 3.5? (under Vista, maybe XP)

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After installing IE8 Beta 1, WPF can no longer display images that have a web URI.

I un-installed IE8, it fixed the problem, re-installed it and the problem showed up again.

Here is a test program that illustrates the problem:

 

******* private void Window_Loaded(object sender, RoutedEventArgs e)

******* {

*********** try

*********** {

*************** BitmapImage bitmap = new BitmapImage();

*************** bitmap.BeginInit();

*************** bitmap.UriSource = new Uri(

******************* "http://www.microsoft.com/presspass/images/gallery/logos/web/mslogo-1.jpg",

******************* UriKind.Absolute);

*************** bitmap.EndInit();

*************** Image img = new Image();

*************** img.Source = bitmap;

*************** grid.Children.Add(img);

*********** }

*********** catch (Exception ex)

*********** {

*************** MessageBox.Show(string.Format("{0}\r\n\r\n{1}", ex.Message, ex.StackTrace));

*********** }

******* }

 

 

 

Here are some details on the exception that is thrown at bitmap.EndInit():

 

ex.Message

Value does not fall within the expected rage.

 

ex.StackTrace

at System.Runtime.InteropServices.Marshal.ThrowExceptionForHRInternal(Int32 errorCode, IntPtr errorInfo)

 

at MS.Win32.WinInet.get_InternetCacheFolder()

 

at System.Windows.Media.Imaging.BitmapDownload.BeginDownload(

** BitmapDecoder decoder, Uri uri, RequestCachePolicy uriCachePolicy, Stream stream)

 

at System.Windows.Media.Imaging.LateBoundBitmapDecoder..ctor(

** Uri baseUri, Uri uri, Stream stream, BitmapCreateOptions createOptions,

** BitmapCacheOption cacheOption, RequestCachePolicy requestCachePolicy)

 

at System.Windows.Media.Imaging.BitmapDecoder.CreateFromUriOrStream(

** Uri baseUri, Uri uri, Stream stream, BitmapCreateOptions createOptions,

** BitmapCacheOption cacheOption, RequestCachePolicy uriCachePolicy,

** Boolean insertInDecoderCache)

 

at System.Windows.Media.Imaging.BitmapImage.FinalizeCreation()

 

at System.Windows.Media.Imaging.BitmapImage.EndInit()

 

at WpfApplication5.Window1.Window_Loaded(Object sender, RoutedEventArgs e)

 

 

 

Here are a few "high level" things I tried to do to fix the problem:

- Changing the UriCachePolicy of the BitmapImage: none of the RequestCacheLevel enumeration values was able to fix the problem.

- Deleting the IE Cache: no luck here

- Running the test Program as Admin: no luck either

 

 

The next thing I did was setting up the .NET Framework Source Code Debugging (link):

 

I stepped into the code from the bitmap.EndInit() call to the MS.Win32.WinInet.get_InternetCacheFolder() call, I found that the problem occurs in the native calls to GetUrlCacheConfigInfo, which is located in wininet.dll. This DLL fails to return the internet cache folder properly.

 

 

*** internal static Uri InternetCacheFolder

*** {

******* [securityCritical]

******* get

******* {

*********** // copied value 260 from orginal implementation in BitmapDownload.cs

*********** const int maxPathSize = 260;

*********** const UInt32 fieldControl = (UInt32)maxPathSize;

*

*********** NativeMethods.InternetCacheConfigInfo icci =

*************** new NativeMethods.InternetCacheConfigInfo();

*********** icci.CachePath = new string(new char[maxPathSize]);

*********** UInt32 size = (UInt32)Marshal.SizeOf(icci);

*********** bool passed = UnsafeNativeMethods.GetUrlCacheConfigInfo(

*************** ref icci,

*************** ref size,

*************** fieldControl);

*********** if (!passed)

*********** {

*************** int hr = Marshal.GetHRForLastWin32Error();

*************** if (hr != 0)

*************** {

******************* Marshal.ThrowExceptionForHR(hr);

*************** }

*********** }

*********** return new Uri(icci.CachePath);

******* }

*** }

 

 

I checked the version number of this DLL, and it matches IE8 Beta1's version number: 9.0.6001.17184

 

 

Now that I know the problem is not in WPF itself, I would like to know if XP users are having the same problem. You could simply create a simple wpf program like my test program, or xaml something like this:

 

<font color="#0000ff" size=2><font color="#0000ff" size=2>

 

 

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