In WPF Microsoft provide a new API that allows developers to build speech enabled applications. Speech synthesis is a feature that generates spoken audio based on text you supply. In this article I am trying to show how to use new API in application, simply add a reference to System.Speech and include the following code to your project.

Code .XAML
<Window x:Class="ReportWPF.Window5"
        xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        Title="Window5" Height="300" Width="594">
    <Grid>
        <Label Content="  Example Of Speech Synthesis in WPF" Height="43" HorizontalAlignment="Left" Margin="73,15,0,0" Name="label1" VerticalAlignment="Top" Width="431" FontFamily="Cambria" FontWeight="Normal" FontSize="25">
            <Label.Foreground>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="Black" Offset="0" />
                    <GradientStop Color="#FF71FF00" Offset="1" />
                </LinearGradientBrush>
            </Label.Foreground>
        </Label>
        <Label Height="36" Content="Enter Text for Speech" HorizontalAlignment="Left" Margin="87,89,0,0" Name="label2" VerticalAlignment="Top" Width="191" FontFamily="Shruti" FontWeight="Bold" FontSize="18" />
        <TextBox Height="23" HorizontalAlignment="Left" Margin="300,97,0,0" Name="textBox1" VerticalAlignment="Top" Width="203" />
        <Button Content="Start Voice" Height="35" HorizontalAlignment="Left" Margin="246,160,0,0" Name="button1" VerticalAlignment="Top" Width="89" Foreground="#FFECDADA" FontFamily="Times New Roman" FontSize="18" Click="button1_Click">
            <Button.Background>
                <LinearGradientBrush EndPoint="0.5,1" StartPoint="0.5,0">
                    <GradientStop Color="Black" Offset="0" />
                    <GradientStop Color="#FF36FF00" Offset="1" />
                </LinearGradientBrush>
            </Button.Background>
        </Button>
    </Grid>
</Window>

 

Code .cs:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
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.Shapes;
using System.Speech.Synthesis;// Add speech namespace in application
namespace ReportWPF
{
       
    public partial class Window5 : Window
    {
        public Window5()
        {
            InitializeComponent();
        }
 
        private void button1_Click(object sender, RoutedEventArgs e)
        {
            SpeechSynthesizer synthesizer = new SpeechSynthesizer();//create insatnce of SpeechSynthesizer class
            PromptBuilder promptBuilder = new PromptBuilder();//create insatnce of PromptBuilder class
 
            promptBuilder.AppendText(textBox1.Text);//AppendText is a method of PromptBuilder class that is parameterized that take string value
 
            synthesizer.SpeakAsync(promptBuilder);//SpeakAsync is a method of SpeechSynthesizer class that is parameterized that take object of PromptBuilder class
        }
    }
}

 

Screen Shot: 

In below screen shot I have entered some text in textbox than I clicked on button system narrator will narrate all text in given textbox.

Example of SpeechSynthesizer class in WPF

 

 

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