SpeechCommandExample.cs

using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Globalization;
using System.Linq;

using System.Text;
using System.Threading.Tasks;
using Microsoft.Speech.Recognition;
using Microsoft.Speech.Synthesis;
// https://www.youtube.com/watch?v=9aHJ-FAzQaE
namespace ConsoleApplication5
{
    class Program
    {
        static SpeechSynthesizer ss = new SpeechSynthesizer();
        static ReadOnlyCollection<RecognizerInfo> isr = SpeechRecognitionEngine.InstalledRecognizers();
        static SpeechRecognitionEngine sre = new SpeechRecognitionEngine(CultureInfo.GetCultureInfo("ru-RU"));
        static bool done = false;
        static bool speechOn = true;

        static void Main(string[] args)
        {
           
            ss.SetOutputToDefaultAudioDevice();

            ss.Speak("Привет, человек.");

            sre.SetInputToDefaultAudioDevice();
            sre.SpeechRecognized += sre_SpeechRecognized;

            Choices ch_StartStopCommands = new Choices();
            ch_StartStopCommands.Add("говори");
            ch_StartStopCommands.Add("молчи");
            ch_StartStopCommands.Add("стоп");
            GrammarBuilder gb_StartStop = new GrammarBuilder();
            gb_StartStop.Append(ch_StartStopCommands);
            Grammar g_StartStop = new Grammar(gb_StartStop);

            Choices ch_Numbers = new Choices();
            ch_Numbers.Add("1");
            ch_Numbers.Add("2");
            ch_Numbers.Add("3");
            ch_Numbers.Add("4");
            ch_Numbers.Add("6");
            ch_Numbers.Add("7");
            ch_Numbers.Add("8");
            ch_Numbers.Add("9");
            ch_Numbers.Add("10");
            GrammarBuilder gb_WhatIsXplusY = new GrammarBuilder();
            gb_WhatIsXplusY.Append("Сколько будет ");
            gb_WhatIsXplusY.Append(ch_Numbers);
            gb_WhatIsXplusY.Append(" плюс ");
            gb_WhatIsXplusY.Append(ch_Numbers);
            Grammar g_WhatIsXplusY = new Grammar(gb_WhatIsXplusY);

            sre.LoadGrammarAsync(g_StartStop);
            sre.LoadGrammarAsync(g_WhatIsXplusY);

            sre.RecognizeAsync(RecognizeMode.Multiple);

            while (done == false) {; }
            Console.WriteLine("\nHit  to close shell\n");
            Console.ReadLine();


        }


        static void sre_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {

            string txt = e.Result.Text;
            double confidence = e.Result.Confidence;
            Console.WriteLine("\nRecognized: " + txt);

            if (confidence < 0.50)
            {
                foreach (var alt in e.Result.Alternates)
                {
                    Console.WriteLine($"{alt.Text}\t{alt.Confidence}");
                }
                
                
                return;
            }

            if (txt.IndexOf("говори") >= 0)
            {
                Console.WriteLine("Говорилка включена");
                speechOn = true;
            }

            if (txt.IndexOf("молчи") >= 0)
            {
                Console.WriteLine("Говорилка выключена");
                speechOn = false;
            }

            if (speechOn == false) return;

            if (txt.IndexOf("стоп") >= 0)
            {
                ((SpeechRecognitionEngine)sender).RecognizeAsyncCancel();
                done = true;
                ss.Speak("До свидания!");
            }

            if (txt.IndexOf("Сколько") >= 0 && txt.IndexOf("плюс") >= 0) // what is 2 plus 3
            {
                string[] words = txt.Split(' ');     // or use e.Result.Words
                int num1 = int.Parse(words[2]);
                int num2 = int.Parse(words[4]);
                int sum = num1 + num2;
                Console.WriteLine("Говорилка: " + words[2] + " + " + words[4] + " = " + sum);
                ss.SpeakAsync(words[2] + " плюс " + words[4] + " будет " + sum);
            }
        } // sre_SpeechRecognized
    }
}