C# MediaCapture.Dispose方法代码示例

        public async Task<RecordingToken> StartAsync()
        {
            var capture = new MediaCapture();

            var initSettings = new MediaCaptureInitializationSettings();
            initSettings.StreamingCaptureMode = StreamingCaptureMode.Audio;

            await capture.InitializeAsync(initSettings);

            var fileName = DateTimeOffset.Now.TimeOfDay.ToString().Replace(':', '_') + ".wav";
            var file = await ApplicationData.Current.LocalFolder.CreateFileAsync(fileName);

            var profile = MediaEncodingProfile.CreateWav(AudioEncodingQuality.Medium);
            await capture.StartRecordToStorageFileAsync(profile, file);

            return new RecordingToken(file.Path, async () =>
            {
                await capture.StopRecordAsync();
                // It's important to dispose the capture device here to avoid application crash when using FileSavePicker afterwards
                capture.Dispose();
            });
        }

        // Must be called on the UI thread
        private async Task DisposeCaptureAsync()
        {
            Preview.Source = null;

            if (autoFocus != null)
            {
                autoFocus.Dispose();
                autoFocus = null;
            }

            MediaCapture mediaCapture;
            lock (this)
            {
                mediaCapture = this.mediaCapture;
                this.mediaCapture = null;
            }

            if (mediaCapture != null)
            {
                mediaCapture.Failed -= OnMediaCaptureFailed;

                await mediaCapture.StopPreviewAsync();

                mediaCapture.Dispose();
            }
        }

 private async Task<bool> IsMicrophoneAvailable()
 {
     // Error messages from: https://msdn.microsoft.com/en-us/library/windows/apps/hh768223.aspx#additional_usage_guidance
     try
     {
         // We do this initialization (and tear down immediately after) just to check if we have access to a microphone.
         // We'll do the actual work with NAudio, since MediaCapture doesn't supply raw PCM data that we need.
         var mediaCapture = new MediaCapture();
         await mediaCapture.InitializeAsync();
         mediaCapture.Dispose();
         return true;
     }
     catch (UnauthorizedAccessException)
     {
         RaiseMicrophoneIsNotAvailable(
             "Your microphone is currently turned off. To change your microphone setting, open the settings charm and tap permissions. " +
             "Then tap the mute button to start using microphone again.");
         return false;
     }
     catch (Exception)
     {
         RaiseMicrophoneIsNotAvailable(
             "You do not have the required microphone present on your system.");
         return false;
     }
 }

 public async void Capture_Click(object sender, RoutedEventArgs e)
 {
     MediaCapture mediaCapture = new MediaCapture();
     await mediaCapture.InitializeAsync();
     if (mediaCapture.VideoDeviceController.LowLagPhotoSequence.Supported)
     {
         mediaCapture.Dispose();
         Frame.Navigate(typeof(SequenceCapturePage));
     }
     else
     {
         mediaCapture.Dispose();
         Frame.Navigate(typeof(VideoPreviewCapturePage));
     }
 }