<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        x:Class="AvaloniaUI.SpeechRecognition"
        Title="SpeechRecognition">
    <StackPanel Margin="10" Spacing="8">
        <Label x:Name="lbl" Content="空闲..." />
        <TextBlock Text="Try: '红色开', '蓝色关' ..." Opacity="0.7"/>
    </StackPanel>
</Window>

using Avalonia;
using Avalonia.Controls;
using Avalonia.Markup.Xaml;
using Avalonia.Threading;
using System;
using System.Globalization;
using System.Linq;
using System.Speech.Recognition;

namespace AvaloniaUI;

public partial class SpeechRecognition : Window
{
    private SpeechRecognitionEngine? recognizer;

    public SpeechRecognition()
    {
        InitializeComponent();
        try
        {
            var engine = CreateBestAvailableRecognizer();
            if (engine is null)
            {
                SetLabel("No System.Speech recognizer installed on this machine.");
                return;
            }

            recognizer = engine;

            var grammar = new GrammarBuilder();
            grammar.Append(new Choices("红色", "蓝色", "绿色", "黑色", "白色"));
            grammar.Append(new Choices("开", "关"));

            recognizer.LoadGrammar(new Grammar(grammar));

            recognizer.SpeechDetected += (_, _) => SetLabel("Speech detected.");
            recognizer.SpeechHypothesized += (_, _) => SetLabel("Speech uncertain.");
            recognizer.SpeechRecognitionRejected += (_, _) => SetLabel("Speech rejected.");
            recognizer.SpeechRecognized += (_, e) => SetLabel("You said: " + e.Result.Text);

            recognizer.SetInputToDefaultAudioDevice();
            recognizer.RecognizeAsync(RecognizeMode.Multiple);

            SetLabel($"Ready. Recognizer: {recognizer.RecognizerInfo.Culture.Name}");
        }
        catch (Exception ex)
        {
            SetLabel("Init failed: " + ex.Message);
        }
    }

    private SpeechRecognitionEngine? CreateBestAvailableRecognizer()
    {
        var infos = SpeechRecognitionEngine.InstalledRecognizers();
        if (infos is null || infos.Count == 0)
            return null;

        // 你可以按需调整优先级
        var preferred = new[] { "zh-CN", "en-US", "en-GB" };

        var best =
            infos.FirstOrDefault(x => preferred.Contains(x.Culture.Name, StringComparer.OrdinalIgnoreCase))
            ?? infos.First();

        return new SpeechRecognitionEngine(best);
    }

    private void SetLabel(string text) => lbl.Content = text;

    protected override void OnClosed(EventArgs e)
    {
        try
        {
            if (recognizer is not null)
            {
                recognizer.RecognizeAsyncCancel();
                recognizer.RecognizeAsyncStop();
                recognizer.Dispose();
            }
        }
        catch { }

        base.OnClosed(e);
    }
}