windows-phone-7 – 尝试绑定隔离存储映像时应用程序崩溃

在我的应用程序中,我使用下面提到的帮助方法将我的独立存储图像绑定到 Image控件.我从链接“ Binding Image stored in the Isolated Storage to Image Control in Windows Phone”获得了这个帮助方法

public class IsoStoreImageSource : DependencyObject
{
public static void SetIsoStoreFileName(UIElement element,string value)
{
    element.SetValue(IsoStoreFileNameProperty,value);
}
public static string GetIsoStoreFileName(UIElement element)
{
    return (string)element.GetValue(IsoStoreFileNameProperty);
}

// Using a DependencyProperty as the backing store for IsoStoreFileName.  This enables animation,styling,binding,etc...
public static readonly DependencyProperty IsoStoreFileNameProperty =
    DependencyProperty.Registerattached("IsoStoreFileName",typeof(string),typeof(IsoStoreImageSource),new PropertyMetadata("",Changed));

private static void Changed(DependencyObject d,DependencyPropertyChangedEventArgs e)
{
    Image img = d as Image;

    if (img != null)
    {
        var path = e.NewValue as string;
        SynchronizationContext uiThread = SynchronizationContext.Current;

        Task.Factory.StartNew(() =>
        {
            using (var isoStore = IsolatedStorageFile.GetUserStoreForApplication())
            {
                if (isoStore.FileExists(path))
                {
                    var stream = isoStore.OpenFile(path,System.IO.FileMode.Open,FileAccess.Read);
                    uiThread.Post(_ =>
                    {
                        var _img = new BitmapImage();
                        _img.SetSource(stream);
                        img.source = _img;
                    },null);
                }
            }
        });               
    }
}

}

我在ListBox控件中使用它.如果尝试使用默认库图像,一切都将按预期工作.但是,如果我尝试使用大尺寸的图像(通过设备相机拍摄),应用程序会崩溃.

这是我得到的例外

System.Windows.ni.dll中出现“System.OutOfMemoryException”类型的异常,但未在用户代码中处理

堆栈跟踪

在MS.Internal.FrameworkCallbacks.NotifyManagedDebuggerOnNativeOOM()
在MS.Internal.XcpImports.BitmapSource_SetSource(BitmapSource bitmapSource,CValue& byteStream)
在System.Windows.Media.Imaging.BitmapSource.SetSourceInternal(Stream streamSource)
在System.Windows.Media.Imaging.BitmapImage.SetSourceInternal(Stream streamSource)
在System.Windows.Media.Imaging.BitmapSource.SetSource(Stream streamSource)
在MyaPP.Common.IsoStoreImageSource.<> c__displayClass4.<> c__displayClass6.b__1(Object _)

if (img != null)
{
    BitmapImage bitmapImage = img.source as BitmapImage;
    bitmapImage.UriSource = null;
    img.source = null;

    //rest of the code ...
}