Question

我正在开发一个WPF程序，从网上获取图片并使用图像控件。我的图片列表有50张图片（来自vimeo的缩略图）。一切看起来很好但是数字45.图片有一些问题，当我到达第45张图片时，我得到了这个例外：

价值不在预期范围内。

exception http://img232.imageshack.us/img232/2748/5688301315b2497090468bc.png

我使用了try-catch但我无法抓住它。因为它出现在Bitmap类中。以下是详细信息：

   at System.Windows.Media.ColorContext.GetColorContextsHelper(GetColorContextsDelegate getColorContexts)
   at System.Windows.Media.Imaging.BitmapFrameDecode.get_ColorContexts()
   at System.Windows.Media.Imaging.BitmapImage.FinalizeCreation()
   at System.Windows.Media.Imaging.BitmapImage.OnDownloadCompleted(Object sender, EventArgs e)
   at System.Windows.Media.UniqueEventHelper.InvokeEvents(Object sender, EventArgs args)
   at System.Windows.Media.Imaging.LateBoundBitmapDecoder.DownloadCallback(Object arg)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.DispatcherOperation.InvokeImpl()
   at System.Windows.Threading.DispatcherOperation.InvokeInSecurityContext(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Windows.Threading.DispatcherOperation.Invoke()
   at System.Windows.Threading.Dispatcher.ProcessQueue()
   at System.Windows.Threading.Dispatcher.WndProcHook(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndWrapper.WndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam, Boolean& handled)
   at MS.Win32.HwndSubclass.DispatcherCallbackOperation(Object o)
   at System.Windows.Threading.ExceptionWrapper.InternalRealCall(Delegate callback, Object args, Int32 numArgs)
   at MS.Internal.Threading.ExceptionFilterHelper.TryCatchWhen(Object source, Delegate method, Object args, Int32 numArgs, Delegate catchHandler)
   at System.Windows.Threading.Dispatcher.LegacyInvokeImpl(DispatcherPriority priority, TimeSpan timeout, Delegate method, Object args, Int32 numArgs)
   at MS.Win32.HwndSubclass.SubclassWndProc(IntPtr hwnd, Int32 msg, IntPtr wParam, IntPtr lParam)
   at MS.Win32.UnsafeNativeMethods.DispatchMessage(MSG& msg)
   at System.Windows.Threading.Dispatcher.PushFrameImpl(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.PushFrame(DispatcherFrame frame)
   at System.Windows.Threading.Dispatcher.Run()
   at System.Windows.Application.RunDispatcher(Object ignore)
   at System.Windows.Application.RunInternal(Window window)
   at System.Windows.Application.Run(Window window)
   at System.Windows.Application.Run()
   at youtube.App.Main() in C:\.........\obj\x86\Debug\App.g.cs:line 0
   at System.AppDomain._nExecuteAssembly(RuntimeAssembly assembly, String[] args)
   at System.AppDomain.ExecuteAssembly(String assemblyFile, Evidence assemblySecurity, String[] args)
   at Microsoft.VisualStudio.HostingProcess.HostProc.RunUsersAssembly()
   at System.Threading.ThreadHelper.ThreadStart_Context(Object state)
   at System.Threading.ExecutionContext.RunInternal(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state, Boolean preserveSyncCtx)
   at System.Threading.ExecutionContext.Run(ExecutionContext executionContext, ContextCallback callback, Object state)
   at System.Threading.ThreadHelper.ThreadStart()

这是我的代码：

for (int i = 0; i <50 ; i++)
{
    product p = new product();

    Common.SelectedOldColor = p.Background;
    p.VideoInfo = results[i];
    Common.Products.Add(p, false);
    p.Visibility = System.Windows.Visibility.Hidden;
    p.Drop_Event += new product.DragDropEvent(p_Drop_Event);
    main.Children.Add(p);
}

当我设置p.VideoInfo = results[i];属性时，它会分配一些内容：

private VideoList videoInfo;
public VideoList VideoInfo
{
    get { return videoInfo; }
    set
    {
        videoInfo = value;
        label1.Content = videoInfo.Title;
        try
        {
             image1.Source = new BitmapImage(new Uri(videoInfo.ThumbNail));
        }
        catch (Exception ex)
        {

        }             
    }
}

image1.Source = new BitmapImage(new Uri(videoInfo.ThumbNail));

以下是问题的根源。但只是为了这张图片：

problem image

我尝试了很多次，每张图片都很好。但这一个是不同的？也许它很模糊？

如何解决此问题？也许我可以使用不同的方式将源分配给image1？

我希望我描述得很好。

Answer 1

尝试忽略颜色配置文件，可能是元数据已损坏：

var bi = new BitmapImage();
bi.BeginInit();
    bi.CreateOptions = BitmapCreateOptions.IgnoreColorProfile;
    bi.UriSource = new Uri("http://hanselman.com/blog/images/JPGwithBadColorProfile.jpg");
bi.EndInit();

foo.Source = bi;

或使用XAML：

<Image>
    <Image.Source>
        <BitmapImage CreateOptions="IgnoreColorProfile" UriSource="{Binding ....}"/>
    </Image.Source>
</Image>

另见Source。

Answer 2

它让我想起了我自己的问题。如果以紧凑的循环加载图像，它将在X图像后崩溃。您可能需要将线程返回给调度程序一秒钟以清理一些已用过的内存。

来源：

How to use the dispatcher to load multiple images
Silverlight: BitmapImage from stream throws exception (Catastrophic failure (Exception from HRESULT: 0x8000FFFF (E_UNEXPECTED)))

从互联网获取图像时有趣的例外

2 个答案: