Windows Phone的录音与回放实现(个人记录)

        // 麦克风实例
        Microphone mMicrophone = Microphone.Default;
        MemoryStream mStream = new MemoryStream();

        /// <summary>
        /// 页面构造
        /// </summary>
        public ChatPanoramaPage()
        {
            InitializeComponent();


            // 模拟XNA的游戏循环Timer to simulate the XNA Game Studio game loop (Microphone is from XNA Game Studio)
            DispatcherTimer dt = new DispatcherTimer();
            dt.Interval = TimeSpan.FromMilliseconds(50);
            dt.Tick += delegate { try { FrameworkDispatcher.Update(); } catch { } };
            dt.Start();

            // 处理它的BufferReady事件
            mMicrophone.BufferReady += new EventHandler<EventArgs>(mMicrophone_BufferReady);
            
        }

     /// <summary>
        /// 将数据写入到buffer
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void mMicrophone_BufferReady(object sender, EventArgs e)
        {
            byte[] buffer = new byte[1024];
            int offset = this.mMicrophone.GetData(buffer, 0, 1024);
            while (offset > 0)
            {
                if (this.mStream.Length + offset > 5242000)
                {
                    this.mMicrophone.Stop();
                    MessageBox.Show("The recording has been stopped as it is too long.");
                    return;
                }
                this.mStream.Write(buffer, 0, offset);
                offset = this.mMicrophone.GetData(buffer, 0, 1024);
            }
        }

        /// <summary>
        /// 点击按钮进行录音，再次点击则播放
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void VoiceImage_Tap_1(object sender, System.Windows.Input.GestureEventArgs e)
        {
            // 还没有开始录音
            if (!isStart)
            {
                VoiceImage.Source = new BitmapImage(new Uri("/Images/mic_w48.png", UriKind.Relative));

                // 录音开始
                if (this.mStream != null)
                {
                    this.mStream.Close();
                }

                this.mStream = new MemoryStream();
                if (this.mMicrophone.State != MicrophoneState.Started)
                {
                    this.mMicrophone.Start();

                    ToastPrompt toast = new ToastPrompt { Message = "录完音后按停止键播放录音" };
                    toast.Show();

                    isStart = true;
                }

            }
            else  // 已经开始了录音
            {
                VoiceImage.Source = new BitmapImage(new Uri("/Images/microphone.png", UriKind.Relative));
                // 停止录音
                if (mMicrophone.State == MicrophoneState.Started)
                {
                    mMicrophone.Stop();
                    isStart = false;
                }

                // 播放录音
                playRecord();

            }
        }

    /// <summary>
        ///  播放录音
        /// </summary>
        private void playRecord()
        { 
            if (this.mStream == null || this.mStream.Length == 0)
            {
                return;
            }

            this.mStream.Position = 0;
            SoundEffect soundEffect = new SoundEffect(this.mStream.ToArray(), this.mMicrophone.SampleRate, AudioChannels.Mono);
            soundEffect.Play();
        }