windows-phone-8 - Windows Phone 8：MediaLibrary 无效操作异常

Question

我正在开发一个 Windows Phone 8 应用程序，它从设备库中获取所有图片并将它们显示在列表框中。但是当我运行它时，有时会弹出一个错误，上面写着：Microsoft.Xna.Framework.ni.dll 中发生了“System.InvalidOperationException”类型的异常，但未在用户代码中处理

有什么建议吗？

我的代码是：

    Dim notes As New List(Of Note)

    Dim m As New MediaLibrary
    Dim whatnumber As Integer = m.Pictures.Count

    TextBlock2.Text = whatnumber.ToString + " IMAGES"

    Dim imagesources As ImageSource()
    ReDim imagesources(whatnumber)

    Dim counter As Integer = 1
    For Each pic In m.Pictures

        imagesources(counter) = PictureDecoder.DecodeJpeg(pic.GetThumbnail)
        notes.Add(New Note With {.ImageName = imagesources(counter), .Title = counter.ToString})
        counter = counter + 1

    Next

    ListBox1.ItemsSource = notes