利用现有的队列进行语音朗读

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Speech.Synthesis;
using System.Threading;

namespace Utility
{
    public sealed class Sound
    {
        private static object obj = new object();
        private static Queue<string> speckList;
        public static void AddToPlay(string content)
        {
            if (string.IsNullOrWhiteSpace(content))
                return;
            lock (obj)
            {
                if (speckList == null)
                {
                    speckList = new Queue<string>();
                    StartProcess();
                }
                speckList.Enqueue(content);
            }
        }
        public static void StartProcess()
        {
            Thread speck = new Thread(() =>
                {
                    while (true)
                    {
                        lock (obj)
                        {
                            if (speckList != null && speckList.Count > 0)
                            {
                                sendSound(speckList.Dequeue());
                                if (speckList.Count == 0)
                                {
                                    speckList = null;
                                    break;
                                }
                            } 
                        }
                    }
                });
            speck.IsBackground = true;
            speck.Start();
        }


        //保存上次播放的语言
        private static string lastString = string.Empty;
        //保存默认的信息
        private static string firstString = string.Empty;
        public static void SpeckNoRepeate(string sound)
        {

            if (string.IsNullOrWhiteSpace(firstString))//第一次赋值
            {
                if (sound.Equals(ConfigHelper.GateInfo.InitialMessage))
                {
                    firstString = sound;
                }
            }
            else
            {
                if (sound.Equals(firstString))
                {
                    return;
                }
                sound += "  " + sound;

            }
            //如果和上一次的信息一致，则取消发送语音，可以避免多次重复刷卡
            if (lastString.Equals(sound))
            {
                return;
            }
            sendSound(sound);
            lastString = sound;
        }

        private static void sendSound(string sound)
        {
            using (SpeechSynthesizer _speaker = new SpeechSynthesizer())
            {
                _speaker.SelectVoiceByHints(VoiceGender.Female);
                PromptBuilder prompt = new PromptBuilder();
                PromptStyle style = new PromptStyle
                {
                    Rate = PromptRate.Slow,
                    Volume = PromptVolume.ExtraLoud
                };

                prompt.StartStyle(style);

                prompt.AppendText(Changestring(sound));
                prompt.EndStyle();

                _speaker.Speak(prompt);
            }
        }
        private static string Changestring(string input)
        {
            return input.Replace(" ", "、")
                .Replace("0", " 零")
                .Replace("1", " 一")
                .Replace("2", " 二")
                .Replace("3", " 三")
                .Replace("4", " 四")
                .Replace("5", " 五")
                .Replace("6", " 六")
                .Replace("7", " 七")
                .Replace("8", " 八")
                .Replace("9", " 九")
                .Replace("-", "杠")
                .Replace("A", " A")
                .Replace("B", " B")
                .Replace("C", " C")
                .Replace("D", " D")
                .Replace("E", " E")
                .Replace("F", " F")
                .Replace("G", " G")
                .Replace("H", " H")
                .Replace("I", " I")
                .Replace("J", " J")
                .Replace("K", " K")
                .Replace("L", " L")
                .Replace("M", " M")
                .Replace("N", " N")
                .Replace("O", " O")
                .Replace("P", " P")
                .Replace("Q", " Q")
                .Replace("R", " R")
                .Replace("S", " S")
                .Replace("T", " T")
                .Replace("U", " U")
                .Replace("V", " V")
                .Replace("W", " W")
                .Replace("X", " X")
                .Replace("Y", " Y")
                .Replace("Z", " Z")
                .Replace('#', ' ')
                ;
        }
    } 
}

界面只需调用AddToPlay(string) 方法，即可按顺序进行播放语言。该方法利用序列的先进先出特点。可按顺序即时（但不一定实时，因为语音朗读需要时间）。 当队列为空时就关闭后台进程。