尝试旋转相机拍摄的图像时出现异常

Question

我的应用分析在台式机和手机上显示此例外：

STOWED_EXCEPTION_System.Exception_88982f50_KNFB-Reader_Windows10.dll！$ 0_MyApp_Windows10 :: MyCamera :: _ GetRotatedIBuffer_d__27.MoveNext

有人可以向我解释下面的代码有什么问题吗？

这是堆栈跟踪：

public async Task<IBuffer> TakePhotoAsync()
{
        Debug.WriteLine("taking picture...");

        using (var stream = new InMemoryRandomAccessStream())
        {
            try
            {
                await mediaCapture.CapturePhotoToStreamAsync(ImageEncodingProperties.CreateJpeg(), stream);
                Debug.WriteLine("captured to stream");
            }
            catch (Exception e)
            {
                ExceptionHandler.Instance.HandleException(e);
            }

            //rotate img
            return await GetRotatedIBuffer(stream);
        }
}

public async Task<IBuffer> GetRotatedIBuffer(IRandomAccessStream stream)
{
        //rotate img
        using (var imageStream = new InMemoryRandomAccessStream())
        {
            BitmapDecoder dec = await BitmapDecoder.CreateAsync(stream);
            BitmapEncoder enc = await BitmapEncoder.CreateForTranscodingAsync(imageStream, dec);

            BitmapRotation rotation = BitmapRotation.None;
            switch (KNFBSettings.Instance.DefaultCamera.Rotation)
            {
                case VideoRotation.Clockwise180Degrees:
                    rotation = BitmapRotation.Clockwise180Degrees;
                    break;
                case VideoRotation.Clockwise270Degrees:
                    rotation = BitmapRotation.Clockwise270Degrees;
                    break;
                case VideoRotation.Clockwise90Degrees:
                    rotation = BitmapRotation.Clockwise90Degrees;
                    break;
            }

            enc.BitmapTransform.Rotation = rotation;
            await enc.FlushAsync();

            return await StreamHelpers.StreamToIBuffer(imageStream);
        }
}