Speech Synthesis

<Window x:Class="Synthesizer.MainWindow"
             xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:local="clr-namespace:Synthesizer"
             mc:Ignorable="d"
             d:DesignHeight="450" d:DesignWidth="800">
    <Window.Title>Synthesizer</Window.Title>
    <Window.Resources>
        <local:DoubleToStringConverter x:Key="converter" />
    </Window.Resources>
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
            <RowDefinition Height="Auto" />
        </Grid.RowDefinitions>
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="*" />
            <ColumnDefinition Width="Auto" />
        </Grid.ColumnDefinitions>
        <TextBox Name="PreviewTextBox" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="2" Margin="5 5 5 5" VerticalScrollBarVisibility="Auto" TextWrapping="Wrap"/>
        <ComboBox Name="VoiceComboBox" Grid.Row="1" Grid.Column="0" Width="320" Height="30" Margin="5 5 5 5" Grid.ColumnSpan="2"/>
        <Slider Name="SpeedSlider" Grid.Row="2" Grid.Column="0" Grid.ColumnSpan="2" Width="320" Margin="5 5 5 5" Minimum="0.5" Maximum="1.0" Value="1.0"/>
        <Label Name="SpeedLabel" Grid.Row="3" Grid.Column="0" Grid.ColumnSpan="2" Margin="5 5 5 5" HorizontalAlignment="Center" Content="{Binding ElementName=SpeedSlider, Path=Value, Converter={StaticResource converter}}"/>
        <Button Name="SaveButton" Grid.Row="3" Grid.Column="1" Width="80" Height="45" Margin="5 5 5 5" Content="Save" Click="SaveButtonClick" />
    </Grid>
</Window>

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
using Microsoft.Win32;
using Windows.Storage;
using Windows.Storage.Streams;
using Windows.Media.SpeechSynthesis;
using System.IO;

namespace Synthesizer
{
    /// <summary>
    /// MainWindow.xaml 的交互逻辑
    /// </summary>
    public partial class MainWindow : Window
    {
        public MainWindow()
        {
            InitializeComponent();
            foreach (var voice in SpeechSynthesizer.AllVoices.OrderBy(voice => voice.Language))
            {
                VoiceComboBox.Items.Add(new ComboBoxItem() { Tag=voice,Content=string.Format("{0} ({1})",voice.DisplayName, voice.Language)});
            }
            if (VoiceComboBox.Items.Count > )
            {
                VoiceComboBox.SelectedIndex = ;
            }
        }

        [STAThread]
        public static void Main(string[] args)
        {
            new MainWindow().ShowDialog();
        }

        private async void SaveButtonClick(object sender, RoutedEventArgs e)
        {
            var dialog = new SaveFileDialog()
            {
                Filter = "WAV File|*.wav"
            };
            if (dialog.ShowDialog() != true)
            {
                return;
            }
            var synthesizer = new SpeechSynthesizer()
            {
                Voice = (VoiceComboBox.SelectedItem as ComboBoxItem).Tag as VoiceInformation
            };
            synthesizer.Options.SpeakingRate = SpeedSlider.Value;
            var stream = await synthesizer.SynthesizeTextToStreamAsync(PreviewTextBox.Text);
            using (var file = new FileStream(dialog.FileName, FileMode.Create))
            {
                stream.AsStream().CopyTo(file);
            }
        }
    }
}

using System;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Data;

namespace Synthesizer
{
    [ValueConversion(typeof(double), typeof(string))]
    class DoubleToStringConverter : IValueConverter
    {
        public object Convert(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return (value as double?)?.ToString("F2");
        }

        public object ConvertBack(object value, Type targetType, object parameter, CultureInfo culture)
        {
            return double.Parse(value as string);
        }
    }
}