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本程序是口算两位数乘法，随机生成两个两位数，用语音读出来。然后开启语音识别，接受用户输入，知道答案正确关闭语音识别。用户说答案时，可以说“再说一遍”重复题目。

关键是GrammarBuilder和Choices的用法。

首先来看看如何获得已安装的语音识别引擎

 

void showInstalled()
    {
        Console.WriteLine("installed recognizers");
        foreach (var i in SpeechRecognitionEngine.InstalledRecognizers())
        {
            Console.WriteLine(String.Format("{0}\t{1}\t{2}\t{3}\n", i.Id, i.Name, i.Culture, i.Description));
        }
    }

 

 下面是主程序

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Speech;
using System.Speech.Recognition;
using System.Globalization;
using System.Windows.Forms;
using System.Speech.Synthesis;
public class Haha
{
    static void Main()
    {
        new Haha();
    }
    SpeechRecognitionEngine recognizer = new SpeechRecognitionEngine();
    int x, y, z;
    SpeechSynthesizer cout = null;
    Haha()
    {
        recognizer.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(recognizer_SpeechRecognized);
        recognizer.SetInputToDefaultAudioDevice();
        String s = "0";
        for (int i = 1; i <= 9; i++) s += " " + i;
        GrammarBuilder num = new GrammarBuilder(new Choices(s.Split(new char[] { ' ' })));
        num = new GrammarBuilder(num, 1, 4);
        Choices all = new Choices();
        all.Add(num);
        all.Add("再说一遍");
        recognizer.LoadGrammarAsync(new Grammar(all));
        run();
    }
    void run()
    {
        cout = new SpeechSynthesizer();
        Random random = new Random();
        while (true)
        {
            x = random.Next(11, 99);
            y = random.Next(11, 99);
            z = -1;
            cout.Speak(x + "成以" + y);
            recognizer.RecognizeAsync(RecognizeMode.Multiple);
            while (true)
            {
                if (z != -1)
                {
                    if (z == x * y)
                    {
                        cout.Speak("正确，真聪明");
                        break;
                    }
                    else
                    {
                        cout.Speak(String.Format("不是{0}，再算！",z));
                        z = -1;
                    }
                }
            }
            recognizer.RecognizeAsyncStop();
        }
    }
    void recognizer_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
    {
        string text = e.Result.Text;
        Console.WriteLine(text);
        if (text == "再说一遍")
        {
            cout.Speak(x + "成以" + y);
            return;
        }
        try
        {
            z = int.Parse(text);
        }
        catch
        {
            z = -1;
        }
    }
}