在.net中要实现语音合成可以利用微软的语音技术，利用微软的这一技术，需要安装Microsoft Speech SDK和语音库，安装之后，调用com中的Microsoft Speech Object Library，即可实现语音合成。

MicrosoftSpeech SDK 5.1的下载地址：

SDK 5.1 下载， 这里

SDK 5.1 语言包，这里

SDK 5.1 语音文件，这里

下面是调用语音合成的一个类

using System;
using SpeechLib;namespace SpeechTest
{/// <summary>/// TTS语音合成类/// </summary>public class TTSSpeech{//语音合成对象SpVoice voice = null;/// <summary>/// 构造函数/// </summary>/// <param name="rate">发音频率（-10~10）</param>/// <param name="volume">音量大小（0~100）</param>/// <param name="voiceName">播音员名称</param>public TTSSpeech(int rate,int volume,string voiceName){voice = new SpVoice();//设定音量大小voice.Volume = volume;//设定朗读频率voice.Rate = rate;//设定播音员foreach (ISpeechObjectToken oneIOT in voice.GetVoices(string.Empty, string.Empty)){string[] pVoice = oneIOT.Id.Split(new char[] { '\\' });int count = pVoice.Length;string vName = pVoice[count - 1];if (sVoice == voiceName){voice.Voice = (SpObjectToken)oneIOT;}}}/// <summary>/// 根据文本生成音频文件/// </summary>/// <param name="txtSound">需要转化为声音的文本</param>/// <param name="filePath">音频文件路径</param>public void CreateSoundFile(string txtSound,string filePath){//如果存在音频文件,则删除if (File.Exists(filePath)){File.Delete(filePath);}SpeechStreamFileMode spFileMode = SpeechStreamFileMode.SSFMCreateForWrite;SpFileStream spFileStream = new SpFileStream();spFileStream.Open(filePath, spFileMode, false);voice.AudioOutputStream = spFileStream;SpeechVoiceSpeakFlags flag = SpeechVoiceSpeakFlags.SVSFlagsAsync;int n = voice.Speak(txtSound, flag);voice.WaitUntilDone(1000);spFileStream.Close();}/// <summary>/// 播放声音/// </summary>/// <param name="txtSound">需要转化为声音的文本</param>public void PlaySound(string txtSound){SpeechVoiceSpeakFlags flag = SpeechVoiceSpeakFlags.SVSFlagsAsync;voice.Speak(txtSound, flag);}}
}