Speech recognition in C#?

Question

Speech recognition

Created a simple WinForm program that recognizes speech using the Microsoft.Speech library. Everything works fine, but there is one drawback and this is the creation of grammar. That is, he understands only certain words. Tell me how to do without creating a grammar, or advise another offline speech recognizer without a grammar.

SpeechRecognitionEngine sre;
        CultureInfo ci;
        public Form1()
        {
            InitializeComponent();
        }

        private void Form1_Load(object sender, EventArgs e)
        {
            ci = new CultureInfo("ru-RU");
            sre = new SpeechRecognitionEngine(ci);
            sre.SetInputToDefaultAudioDevice();

            sre.SpeechRecognized += new EventHandler<SpeechRecognizedEventArgs>(Sre_SpeechRecognized);

            Choices ch = new Choices();
            ch.Add("Привет");

            GrammarBuilder gb = new GrammarBuilder();
            gb.Append(ch);

            Grammar grammar = new Grammar(gb);

            sre.LoadGrammar(grammar);
            sre.RecognizeAsync(RecognizeMode.Multiple);
        }

        private void Sre_SpeechRecognized(object sender, SpeechRecognizedEventArgs e)
        {
            if (e.Result.Confidence > 0.12)
            {
                MessageBox.Show(e.Result.Text);
            }
        }

Answer 1

Vosk
Tried only on python, but c# interface seems to be present
https://github.com/alphacep/vosk-api