WP7 录制音频

        //开始录制
        private void btStart_Click(object sender, RoutedEventArgs e)
        {
            audioStream = new MemoryStream();
            microphone.BufferDuration = TimeSpan.FromMilliseconds(1000);
            microphoneBuffer = new byte[microphone.GetSampleSizeInBytes(microphone.BufferDuration)];
            microphone.BufferReady += microphoneBuffer_BufferReady;
            microphone.Start();
            blnRecording = true;
        }
        //停止录制
        private void btStop_Click(object sender, RoutedEventArgs e)
        {
            if (blnRecording)
            {
                microphone.Stop();
                microphone.BufferReady -= microphoneBuffer_BufferReady;
                audioStream.Flush();
                recording = audioStream.ToArray();
                audioStream.Dispose();
                //播放声音
                var effect = new SoundEffect(recording, microphone.SampleRate, AudioChannels.Mono);
                effect.Play();
            }
            btRecording.Visibility = Visibility.Visible;
            btStart.Visibility = Visibility.Collapsed;
            btStop.Visibility = Visibility.Collapsed;
        }
        void microphoneBuffer_BufferReady(object sender, EventArgs e)
        {
            microphone.GetData(microphoneBuffer);
            audioStream.Write(microphoneBuffer, 0, microphoneBuffer.Length);
        }    

1、在Silverlight应用程序中使用XNA Game Studio，需要模拟Game循环来使我们的程序能够正常的实施。
2、定义下面的App.class XNAAsyncDispatcher类并将它添加到App()构造函数的下一行。

ApplicationLifetimeObjects.Add(new XNAAsyncDispatcher(TimeSpan.FromMilliseconds(50)));

 定义类XNAAsyncDispatcher

public class XNAAsyncDispatcher : IApplicationService
    {
        private DispatcherTimer _frameworkDispatcherTimer;
        public XNAAsyncDispatcher(System.TimeSpan dispatchInterval)
        {
            FrameworkDispatcher.Update();
            this._frameworkDispatcherTimer = new DispatcherTimer();
            this._frameworkDispatcherTimer.Tick += new EventHandler(frameworkDispatcherTimer_Tick);
            this._frameworkDispatcherTimer.Interval = dispatchInterval;
        }
        void IApplicationService.StartService(ApplicationServiceContext context)
        {
            this._frameworkDispatcherTimer.Start();
        }
        void IApplicationService.StopService()
        {
            this._frameworkDispatcherTimer.Stop();
        }
        void frameworkDispatcherTimer_Tick(object sender, EventArgs e)
        {
            FrameworkDispatcher.Update();
        }
    }