Windows phone 8.1摄像头初始化- UnAuthorizedException

我正在尝试在我的windows phone 8.1通用应用程序上使用MediaCapture api启动相机。该代码在windows 8.1和windows phone 8.1模拟器上工作正常。我会启动相机拍照。

但是它会在Windows Phone 8.1设备上抛出UnauthorizedException。这里也有类似的问题

但是，我不知道是否有人解决了这个问题。我正在设备上加载应用程序进行测试。我的要求是在侧载应用程序上启动相机。

代码片段:

初始化MediaCapture:

                DeviceInformation cameraDevice = await GetCameraID();
                if (cameraDevice != null)
                {
                    mMediaManager_ = new Windows.Media.Capture.MediaCapture();
                    var settings = new Windows.Media.Capture.MediaCaptureInitializationSettings();
                    settings.StreamingCaptureMode = Windows.Media.Capture.StreamingCaptureMode.Video;
                    settings.MediaCategory = Windows.Media.Capture.MediaCategory.Other;
                    settings.AudioProcessing = Windows.Media.AudioProcessing.Default;
                    settings.VideoDeviceId = cameraDevice.Id;                       
                    await mMediaManager_.InitializeAsync(settings);
                    mMediaManager_.RecordLimitationExceeded += new Windows.Media.Capture.RecordLimitationExceededEventHandler(RecordLimitationExceeded);
                    mMediaManager_.Failed += new Windows.Media.Capture.MediaCaptureFailedEventHandler(RecordFailed);
                }

拍照:

                mMediaStorageFile_ = await folder.CreateFileAsync(fileName, CreationCollisionOption.GenerateUniqueName);
                ImageEncodingProperties imageProperties = ImageEncodingProperties.CreateJpeg();
                await mMediaManager_.CapturePhotoToStorageFileAsync(imageProperties, mMediaStorageFile_);                   
                mCameraScreen_.setPreviewImage(mMediaStorageFile_);