从Internet获取图像时出现有趣的异常 [英] an Interesting Exception While get an Image from Internet

问题描述

我正在用WPF开发一个程序，从网络上获取图片并使用了图像控件.我的图像列表中有50张图片(来自vimeo的缩略图).一切看起来不错，但数字为45.图片出现了问题，当我到达第45张图片时，出现了以下异常:

值不在预期范围内.

.

I am developing a program in WPF, getting a picture from the web and used an image control. My image list has 50 pictures (from vimeo's thumbnails). Everything looks fine but number 45. The picture has some problem and when I get to the 45th picture, I get this exception:

Value does not fall within the expected range.

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

I used try-catch but I can't catch it. Because it occurs in the Bitmap class. Here are the details:

   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()

Here is my code:

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);
}

when I set the p.VideoInfo = results[i]; property, it assigns something:

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));

Here is source of the problem. but just for this image:

I tried many times and each images are fine. But this one is different? Maybe it's blur?

How can I fix this problem? Maybe I can use different way to assign source to image1?

I hope that I described well.

解决方案

Try to ignore the color profile, maybe the metadata is corrupted:

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;

or using XAML:

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

Also look here Source.

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