Windows phone 8.1 WriteableBitmapExtension使设备上的应用程序崩溃

我已经通过NuGet向我的Windows Phone 8.1 WinRT应用程序添加了一个WriteableBitmapExtension。我有从相机中捕获图像并将其保存到图片库的功能。我尝试在保存之前旋转捕获的图像，我在这里找到了解决方案 . 在emulator上一切正常，但当我在诺基亚Lumia 630上运行我的应用程序时，它会在拍照几秒钟后崩溃，而不会显示debbuger消息。有人能帮我解决这个问题吗？以下是我的拍照代码：

public WriteableBitmap Image
   {
        get
        {
            return this.image;
        }

        set
        {
            this.image = value;
            this.RaisePropertyChanged(() => this.Image);
        }
    }

private async void TakePhoto()
        {
            using (var stream = new InMemoryRandomAccessStream())
            {
                var imgEncodingProperties = ImageEncodingProperties.CreateJpeg();
                var img = BitmapFactory.New(640, 480);
                await this.MediaCapture.CapturePhotoToStreamAsync(imgEncodingProperties, stream);
                stream.Seek(0);
                img.SetSource(stream);
                WriteableBitmapExtensions.DrawLine(img, 10, 10, 300, 300, Colors.Black);
                this.Image = img.Rotate(90); 
                this.TurnOffCaptureMode();
            }  
        }

private void TurnOffCaptureMode()
        {
            this.MediaCapture.StopPreviewAsync();
            this.IsInCaptureMode = false;
        }

另一种解决办法是在这里。 1打开文件纠察队使用内置摄像头拍照

 var openPicker = new FileOpenPicker();
    openPicker.ContinuationData["Action"] = "SendPicture";
    openPicker.FileTypeFilter.Add(".jpg");
    openPicker.FileTypeFilter.Add(".png");
    openPicker.PickSingleFileAndContinue();

***2. In app.xaml.cs you will get captured image. as below.***


    public void Continue(IContinuationActivatedEventArgs args)
{
    if(args.Kind == ActivationKind.PickFileContinuation)
    {
        var openPickerContinuationArgs = args as FileOpenPickerContinuationEventArgs;

        // Recover the "Action" info we stored in ContinuationData
        string action = (string) openPickerContinuationArgs.ContinuationData["Action"];

        if(openPickerContinuationArgs.Files.Count > 0)
        {
            // TODO: Get the files here
        }
        else
        {
            // TODO: Write code here to handle picker cancellation.
        }
    }
}