仅在一台PC上例外，在其他PC上工作正常

Question

I have an exception only in one PC, in others all work fine, anyone know wher it is comming from?

dditional information: Requested Windows Runtime type 'Windows.Media.Capture.MediaCapture' is not registered.

This exception is showing only in modern style apps (windows strore app) in windows 8.1. In WPF or Windows Form apps camera works fine. Code is fine, because in other pc work great:) i install system one more time, but the exception still showing up.

Answer 1

Looking at Microsoft's Windows Universal Samples ( https://github.com/Microsoft/Windows-universal-samples/blob/e13cf5dca497ad661706d150a154830666913be4/Samples/SpeechRecognitionAndSynthesis/cs/AudioCapturePermissions.cs#L35 ) shows following piece of code

try
{
    // Request access to the microphone only, to limit the number of capabilities we need
    // to request in the package manifest.
    MediaCaptureInitializationSettings settings = new MediaCaptureInitializationSettings();
    settings.StreamingCaptureMode = StreamingCaptureMode.Audio;
    settings.MediaCategory = MediaCategory.Speech;
    MediaCapture capture = new MediaCapture();

    await capture.InitializeAsync(settings);
}
catch (TypeLoadException)
{
    // On SKUs without media player (eg, the N SKUs), we may not have access to the Windows.Media.Capture
    // namespace unless the media player pack is installed. Handle this gracefully.
    var messageDialog = new Windows.UI.Popups.MessageDialog("Media player components are unavailable.");
    await messageDialog.ShowAsync();
    return false;
}

So you have to install "Media player components".

Answer 2

I just had this issue with Windows 10. I had installed the N edition, but it looks like since it is missing Media Player, the classes related to MediaCapture are also missing. As Hans Passant mentioned, the MediaCapture class was not registered in HKEY_LOCAL_MACHINE\\SOFTWARE\\Microsoft\\WindowsRuntime\\ActivatableClassId.

I reinstalled Window 10 (not the N edition) and now the class is registered.