C#语音播报（通过CoreAudioAPI完成对扬声器的控制）

1，效果：

• 作用：

1. 可对当前内容（例如此例中的重量信息）进行语音合成播报 。
2. 可设置系统扬声器音量与状态(是否静音),同时根据扬声器状态同步更新当前控件状态与值，实现强制PC扬声器按照指定的音量进行播报，杜绝人为静音的可能。

2，引入相关程序集，命名空间。

• 程序集

        微软语音合成程序集：System.Speech

        第三方程序集:CoreAudioAPI（为方便使用，进行了部分修改包装）

• 命名空间：

using System.Speech.Synthesis;
using CoreAudioAPIs;

3，代码：

<Grid>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="112*"/>
            <ColumnDefinition Width="320*"/>
            <ColumnDefinition Width="85*"/>
        Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="59*"/>
            <RowDefinition Height="51*"/>
            <RowDefinition Height="77*"/>
            <RowDefinition Height="43*"/>
            <RowDefinition Height="32*"/>
            <RowDefinition Height="58*"/>
        Grid.RowDefinitions>
        <TextBlock Text="重量：" FontSize="32" HorizontalAlignment="Right" VerticalAlignment="Center" Margin="0,8">TextBlock>
        <TextBox Grid.Column="1" VerticalContentAlignment="Center" x:Name="txtWeight" FontSize="30">TextBox>
        <ComboBox x:Name="combo01" Grid.Column="2" VerticalContentAlignment="Center" FontSize="32">
            <ComboBoxItem FontSize="32" IsSelected="True">KGComboBoxItem>
            <ComboBoxItem FontSize="32">TComboBoxItem>
            <ComboBoxItem FontSize="32">GComboBoxItem>
        ComboBox>
        <Button x:Name="btnPlay" Content="播报" FontSize="25" Grid.Row="1" Grid.Column="1" Margin="20,3" Click="btnPlay_Click">Button>
        <Grid Grid.Row="2" Grid.Column="1">
            <Grid.RowDefinitions>
                <RowDefinition >RowDefinition>
                <RowDefinition >RowDefinition>
               
            Grid.RowDefinitions>
            <TextBlock x:Name="txtStatus" HorizontalAlignment="Center" VerticalAlignment="Center" Text="{Binding Status}" Foreground="{Binding StatusForeground}" FontSize="16">TextBlock>
            <TextBlock FontSize="24" Grid.Row="1"  Text="PC扬声器设置" HorizontalAlignment="Center" VerticalAlignment="Bottom">TextBlock>
        Grid>
        
        <TextBlock Text="播放音量：" Grid.Row="3" FontSize="16" VerticalAlignment="Center" HorizontalAlignment="Right" Margin="0,11,0,10">TextBlock>
        <Slider Grid.Row="3" Grid.Column="1" ValueChanged="slider01_ValueChanged" Minimum="0" VerticalAlignment="Center" Maximum="100" x:Name="slider01" SmallChange="1" LargeChange="5" TickPlacement="BottomRight" IsSnapToTickEnabled="True" Margin="0,11,0,10">Slider>
 
        <TextBlock Grid.Row="3" Grid.Column="2" FontSize="16" VerticalAlignment="Center" Margin="10,0" DockPanel.Dock="Left" Text="{Binding ElementName=slider01 ,Path=Value}">TextBlock>
        <CheckBox Grid.Row="4" x:Name="muteCheck01" Click="muteCheck01_Checked" HorizontalAlignment="Right" VerticalAlignment="Center" FontSize="16">静音CheckBox>
 
    Grid>

 public partial class MainWindow : Window, System.ComponentModel.INotifyPropertyChanged
    {
        VolumeControl volumeControl = new VolumeControl();
        public event PropertyChangedEventHandler PropertyChanged;
        SpeechSynthesizer speeker = new SpeechSynthesizer();
        public MainWindow()
        {
            InitializeComponent();
            volumeControl.VolumeStateChange += VolumeControl_VolumeStateChange;
            slider01.Value = Volume;
            muteCheck01.IsChecked = Mute;
            this.DataContext = this;
            Status = "准备就绪!";
            StatusForeground = new SolidColorBrush(Colors.Green);
        }
        
        public bool Mute
        {
            get
            {
                return volumeControl.IsMuted;
            }
            set
            {
                volumeControl.IsMuted = value;
                OnPropertyChanged(nameof(Mute));
            }
        }
        public int Volume
        {
            get
            {
                return volumeControl.Volume;
            }
            set
            {
                volumeControl.Volume = value;
                OnPropertyChanged(nameof(Volume));
            }
        }
        string status;
        public string Status
        {
            get
            {
                return status;
            }
            set
            {
                status = value;
                OnPropertyChanged(nameof(Status));
            }
        }
        Brush statusForeground = new SolidColorBrush(Colors.Black);
        public Brush StatusForeground
        {
            set
            {
                statusForeground = value;
                OnPropertyChanged(nameof(statusForeground));
            }
            get
            {
                return statusForeground;
            }
        }
        private void VolumeControl_VolumeStateChange(bool mute, int volumeValue)
        {
            Dispatcher.Invoke(() =>
            {
               //移除注册，否则更新控件时将出现循环，这也是不用绑定的原因
                slider01.ValueChanged -= slider01_ValueChanged;
                muteCheck01.Checked -= muteCheck01_Checked;
                this.muteCheck01.IsChecked = mute;
                slider01.Value = volumeValue;
                //重新注册
                slider01.ValueChanged += slider01_ValueChanged;
                muteCheck01.Checked += muteCheck01_Checked;
            });
        }
        private void slider01_ValueChanged(object sender, RoutedPropertyChangedEventArgs<double> e)
        {
            Volume = (int)slider01.Value;
        }
        private void muteCheck01_Checked(object sender, RoutedEventArgs e)
        {
            Mute = muteCheck01.IsChecked.HasValue ? muteCheck01.IsChecked.Value : false;
        }
      
        private void btnPlay_Click(object sender, RoutedEventArgs e)
        {
            PromptBuilder builder = new PromptBuilder();
            builder.AppendText("当前重量：", PromptVolume.Loud);
            builder.AppendBreak(PromptBreak.Medium);
            PromptStyle style = new PromptStyle();
            style.Emphasis = PromptEmphasis.Strong;
            style.Rate = PromptRate.Medium;
            style.Volume = PromptVolume.ExtraLoud;
            builder.StartStyle(style);
            builder.AppendTextWithHint(txtWeight.Text.Trim(), SayAs.NumberCardinal);
            builder.EndStyle();
            string str = "";
            switch (combo01.Text)
            {
                case "KG":
                    str = "千克";
                    break;
                case "G":
                    str = "克";
                    break;
                default:
                    str = "吨";
                    break;
            }
            builder.AppendBreak(PromptBreak.Small);
            builder.AppendText(str, PromptEmphasis.Strong);
            SpeechBroadcasting(builder);
        }
        async void SpeechBroadcasting(PromptBuilder builder)
        {
            Status = "播报中.....";
            StatusForeground = new SolidColorBrush(Colors.Orange);
            await Task.Run(() =>
             {
                 //耗时长
                 speeker.Speak(builder);
             }).ContinueWith(t =>
             {
                 Dispatcher.Invoke(() =>
                 {
                     Status = "播报完成！";
                     StatusForeground = new SolidColorBrush(Colors.BlueViolet);
                 });
                 System.Threading.Thread.Sleep(1000);
             });
            Status = "准备就绪!";
            StatusForeground = new SolidColorBrush(Colors.Green);
        }
        void OnPropertyChanged(string propertyName)
        {
            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));
        }
    }

4，Demo链接：

https://download.csdn.net/download/lingxiao16888/89298014