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我对 GifRenderer 类有疑问。在 Windows Phone 8 应用程序中，我的范围是从存储在应用程序隔离存储中的 png 图像列表开始生成动画 gif，然后保存并共享它。当在我的代码中调用 GifRenderer.RenderAsync 方法时，我有一个 ArgumentException，Value 不在预期范围内，正如您在下面的 VB 代码中看到的那样。我在哪里做错了？

Dim images = New List(Of IImageProvider)
Dim image As Picture

Try
    For Each fileName In fileNames
        images.Add(New StorageFileImageSource(Await StorageFile.GetFileFromPathAsync(IO.Path.Combine(ApplicationData.Current.LocalFolder.Path, fileName))))
    Next

    Dim info = Await images(0).GetInfoAsync()
    Using renderer = New GifRenderer()
        renderer.Size = info.ImageSize
        renderer.Sources = images
        renderer.Duration = 1000
        Dim gifBuffer = Await renderer.RenderAsync()
        Dim stream = gifBuffer.AsStream()

        Using library = New MediaLibrary()
            Dim filename = String.Format("{0}+{1}.gif", IO.Path.GetFileNameWithoutExtension(fileNames(0)), fileNames.Count)
            image = library.SavePicture(IO.Path.GetFileName(filename), stream)
        End Using
    End Using

    Dim task = New ShareMediaTask()
    task.FilePath = image.GetPath()
    task.Show()
Catch ex As Exception
    Debug.WriteLine(ex)
    'renderer.RenderAsync() ->
    'System.ArgumentException: Value does not fall within the expected range.
    ' at System.Runtime.CompilerServices.TaskAwaiter.ThrowForNonSuccess(Task task)
    ' at System.Runtime.CompilerServices.TaskAwaiter.HandleNonSuccessAndDebuggerNotification(Task task)
    ' at System.Runtime.CompilerServices.TaskAwaiter`1.GetResult()
    ' at WP8.App.VB$StateMachine_0_ShareAnimation.MoveNext()
End Try
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