首先，添加DotNetSpeech.dll引用，可以在这里直接下载，也可以参照这篇文章说的，在安装Speech SDK以后，在Common Files\Microsoft Shared\Speech\目录下面找到SAPI.dll，用Tlbimp.exe工具将该dll转换成.net平台下的Assembly---DotNetSpeech.dll。

然后，using DotNetSpeech;

朗读功能：

using DotNetSpeech;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Web.Http;
using System.Speech.Synthesis;
using System.Speech;

namespace MyProject
{
    public class ValuesController : ApiController
    {
        public SpeechSynthesizer synth; //语音合成对象

        //// GET api/<controller>
        //public IEnumerable<string> Get()
        //{
        //    return new string[] { "value1", "value2" };
        //}

        //// GET api/<controller>/5
        //public string Get(string cont)
        //{
        //    return cont;
        //}

        //// POST api/<controller>
        //public void Post([FromBody] string value)
        //{
        //}

        //// PUT api/<controller>/5
        //public void Put(int id, [FromBody] string value)
        //{
        //}

        //// DELETE api/<controller>/5
        //public void Delete(int id)
        //{
        //}

        //[HttpPost]
        [HttpGet]
        public string ToCall(string cont)
        {
            //调用示例：http://192.168.6.195:8081/api/values/ToCall?cont=请，刘笑笑，李秀秀，导医台领结果吧
            //https://localhost:44399/api/values/ToCall?cont=请，刘笑笑，李秀秀，导医台领结果吧


            //SpeechVoiceSpeakFlags flags = SpeechVoiceSpeakFlags.SVSFlagsAsync;
            //SpVoice sp = new SpVoice();
            ////sp.Voice = sp.GetVoices(" name=Microsoft Simplified Chinese ", "").Item(0);
            //sp.Voice = sp.GetVoices(string.Empty, string.Empty).Item(0); //0选择默认的语音,
            //sp.Rate = 0;//语速
            //sp.Volume = 100;//音量
            //sp.Speak(cont, flags);

            synth = new SpeechSynthesizer();
            //使用 synth 设置朗读音量 [范围 0 ~ 100]
            synth.Volume = 100;
            //使用 synth 设置朗读频率 [范围 -10 ~ 10]
            synth.Rate = 0;


            synth.SelectVoice(synth.GetInstalledVoices()[0].VoiceInfo.Name);
            //synth.SelectVoice("Microsoft Lili");
            //Voice.Speak(ggg, SpFlags);
            synth.SpeakAsync(cont);




            return "12345";

        }


        [HttpGet]
        public string GetAll()
        {
            return "Success";
        }



    }
}

注：SpeechVoiceSpeakFlags是语音朗读的风格; Voice中是语音类型(语言、男(女)声),有 Microsoft Simplified Chinese，Microsoft Mary(Sam,Mike)等,

也可以这样：voice.Voice = voice.GetVoices(string.Empty, string.Empty).Item(0); //0选择默认的语音,
1选择第二个语音;Rate指的是语速。

当然，你也可以在此不写，打开控制面板中的语音设置类型和语速

生成语音文件：

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Speech.Synthesis;
using System.Collections.ObjectModel;
using System.Web.Configuration;
using DotNetSpeech;
using Microsoft.Win32;
using System.Windows.Forms;
using System.Threading;


            SpeechVoiceSpeakFlags flags = SpeechVoiceSpeakFlags.SVSFlagsAsync;
            SpVoice sp = new SpVoice();
            //sp.Voice = sp.GetVoices(" name=Microsoft Simplified Chinese ", "").Item(0);
            sp.Voice = sp.GetVoices(string.Empty, string.Empty).Item(0); //0选择默认的语音,
            sp.Rate = 0;//语速
            sp.Speak(strCont, flags);

            System.Windows.Forms.SaveFileDialog dialog = new System.Windows.Forms.SaveFileDialog();
            dialog.Filter = " All files (*.*)|*.*|wav files (*.wav)|*.wav ";
            dialog.Title = " Save to a wave file ";
            dialog.FilterIndex = 2;
            dialog.RestoreDirectory = true;
            if (dialog.ShowDialog() == DialogResult.OK)
            {
                SpeechStreamFileMode spFileMode = SpeechStreamFileMode.SSFMCreateForWrite;
                SpFileStream spFileStream = new SpFileStream();
                spFileStream.Open(dialog.FileName, spFileMode, false);
                sp.AudioOutputStream = spFileStream;
                sp.Speak("文字转语音的内容", flags);
                sp.WaitUntilDone(Timeout.Infinite);
                spFileStream.Close();
            }

（在WinForm和Web中都适用）

参考：http://www.microsoft.com/china/community/program/originalarticles/TechDoc/Cnspeech.mspx

        使用语音即时校对输入内容 - 斯克迪亚 - 博客园

转载于:https://www.cnblogs.com/pfs1314/archive/2011/01/11/1932870.html