使用MediaEncodingProfile.CreateWav(AudioEncodingQuality.High)或MediaEncodingProfile.CreateMp3(AudioEncodingQuality.High)来创建MediaEncodingProfile来记录AudioGraph的输出。以下是一个示例代码：

private async void RecordButton_Click(object sender, RoutedEventArgs e)
{
    var savePicker = new Windows.Storage.Pickers.FileSavePicker();
    savePicker.SuggestedStartLocation = Windows.Storage.Pickers.PickerLocationId.MusicLibrary;
    savePicker.FileTypeChoices.Add("WAV files", new List() { ".wav" });
    savePicker.FileTypeChoices.Add("MP3 files", new List() { ".mp3" });
    savePicker.SuggestedFileName = "New Recording";

    storageFile = await savePicker.PickSaveFileAsync();

    if (storageFile != null)
    {
        AudioEncodingProperties recordQuality = AudioEncodingProperties.CreatePcm(44100, 2, 32);
        MediaEncodingProfile profile = MediaEncodingProfile.CreateWav(AudioEncodingQuality.High);
        profile.Audio = AudioEncodingProperties.CreatePcm(44100, 2, 16);

        await audioGraph.CreateFileOutputNodeAsync(storageFile, profile);

        await audioGraph.StartAsync();
    }
}

在上面的代码，MediaEncodingProfile创建了一个.wav或.mp3文件，用于记录AudioGraph的输出。这样，无论您使用哪个播放器，都可以播放这些文件。