C# 语音识别，请问这篇文章谁能帮忙解释下，看不懂。。。

Question

using System.Speech.Recognition;namespace Douban
{
public partial class MainWindow : Window
{
SpeechRecognizer speechRecognizer;
public MainWindow()
{
InitializeComponent();
// if (Properties.Settings.Default.EnableSpeech)
speechRecognizer = new SpeechRecognizer();
}private void window_Loaded(object sender, RoutedEventArgs e)
{
// if(Properties.Settings.Default.EnableSpeech)
VoiceCommand();
}private void VoiceCommand()
{
RegisterVoiceCommand(VoiceCommand_Close, "退出");
RegisterVoiceCommand(VoiceCommand_Next, "下一首");
RegisterVoiceCommand(VoiceCommand_Minimize, "最小化");
RegisterVoiceCommand(VoiceCommand_Restore, "恢复");RegisterVoiceCommand(VoiceCommand_Pause, "暂停");
RegisterVoiceCommand(VoiceCommand_Resume, "播放");
}private void VoiceCommand_Resume(object sender, EventArgs e)
{
if (mediaPlayer.MediaState != MediaState.Play)
{
if (mediaPlayer.MediaUri != null)
{
mediaPlayer.Play();
pnlPlayer.SetPlayerStatus(true);
}
}
}private void VoiceCommand_Pause(object sender, EventArgs e)
{
if (mediaPlayer.MediaState == MediaState.Play)
{
mediaPlayer.Pause();
pnlPlayer.SetPlayerStatus(false);
}
}private void VoiceCommand_Close(object sender, EventArgs e)
{
this.Close();
}private void VoiceCommand_Next(object sender, EventArgs e)
{}private void VoiceCommand_Minimize(object sender, EventArgs e)
{
this.WindowState = WindowState.Minimized;
}private void VoiceCommand_Restore(object sender, EventArgs e)
{
this.WindowState = WindowState.Normal;
}private void RegisterVoiceCommand(EventHandler Callback, params string[] Args)
{
Choices choices = new Choices();
foreach (string arg in Args)
{
choices.Add(arg);
}
Grammar grammar = new Grammar(new GrammarBuilder(choices));grammar.SpeechRecognized += delegate(object sender, SpeechRecognizedEventArgs e)
{
EventHandler eventHandler = new EventHandler(Callback);
Dispatcher.BeginInvoke(eventHandler, sender, e);
};speechRecognizer.LoadGrammarAsync(grammar);
}原帖地址：http://www.jucoder.com/bbs/thread-8299-0-0.html

Answer 1

using System.Speech.Recognition;namespace Douban
{
    public partial class MainWindow : Window
    {        //创建识别对象
        SpeechRecognizer speechRecognizer;
        public MainWindow()
        {
            InitializeComponent();
            // if (Properties.Settings.Default.EnableSpeech)
            speechRecognizer = new SpeechRecognizer();
        }        private void window_Loaded(object sender, RoutedEventArgs e)
        {
            // if(Properties.Settings.Default.EnableSpeech)
            VoiceCommand();
        }
        /// <summary>
        /// 注册命令
        /// </summary>
        private void VoiceCommand()
        {
            RegisterVoiceCommand(VoiceCommand_Close, "退出");
            RegisterVoiceCommand(VoiceCommand_Next, "下一首");
            RegisterVoiceCommand(VoiceCommand_Minimize, "最小化");
            RegisterVoiceCommand(VoiceCommand_Restore, "恢复");            RegisterVoiceCommand(VoiceCommand_Pause, "暂停");
            RegisterVoiceCommand(VoiceCommand_Resume, "播放");
        }        /// <summary>
        /// 恢复播放
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void VoiceCommand_Resume(object sender, EventArgs e)
        {
            if (mediaPlayer.MediaState != MediaState.Play)
            {
                //如果当前不是播放状态
                if (mediaPlayer.MediaUri != null)
                {
                    //并且当前的播放地址不为空
                    mediaPlayer.Play();
                    //设置当前状态为播放状态
                    pnlPlayer.SetPlayerStatus(true);
                }
            }
        }        /// <summary>
        /// 暂停
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void VoiceCommand_Pause(object sender, EventArgs e)
        {
            if (mediaPlayer.MediaState == MediaState.Play)
            {
                //如果当前为播放状态，则暂停播放，并设置暂停状态
                mediaPlayer.Pause();
                pnlPlayer.SetPlayerStatus(false);
            }
        }        /// <summary>
        /// 关闭
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void VoiceCommand_Close(object sender, EventArgs e)
        {
            this.Close();
        }        /// <summary>
        /// 下一首
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void VoiceCommand_Next(object sender, EventArgs e)
        {        }        /// <summary>
        /// 窗体最小化
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void VoiceCommand_Minimize(object sender, EventArgs e)
        {
            this.WindowState = WindowState.Minimized;
        }        /// <summary>
        /// 窗体恢复
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void VoiceCommand_Restore(object sender, EventArgs e)
        {
            this.WindowState = WindowState.Normal;
        }        /// <summary>
        /// 注册命令
        /// </summary>
        /// <param name="Callback"></param>
        /// <param name="Args"></param>
        private void RegisterVoiceCommand(EventHandler Callback, params string[] Args)
        {
            Choices choices = new Choices();
            foreach (string arg in Args)
            {
                choices.Add(arg);
            }
            Grammar grammar = new Grammar(new GrammarBuilder(choices));            grammar.SpeechRecognized += delegate(object sender, SpeechRecognizedEventArgs e)
            {
                EventHandler eventHandler = new EventHandler(Callback);
                Dispatcher.BeginInvoke(eventHandler, sender, e);
            };            speechRecognizer.LoadGrammarAsync(grammar);
        }
    }
}