C# 中发声

（一）播放音乐
using System;
using System.Runtime.InteropServices;

namespace Sound
{
 /// <summary>
 /// Summary description for PlaySound.
 /// </summary>
 public class PlaySound
 {
  internal class Helpers1
  {
   [Flags]
    public enum PlaySoundFlags : int
   {
    SND_SYNC = 0x0000,  /* play synchronously (default) */ //同步
    SND_ASYNC = 0x0001,  /* play asynchronously */ //异步
    SND_NODEFAULT = 0x0002,  /* silence (!default) if sound not found */
    SND_MEMORY = 0x0004,  /* pszSound points to a memory file */
    SND_LOOP = 0x0008,  /* loop the sound until next sndPlaySound */
    SND_NOSTOP = 0x0010,  /* don't stop any currently playing sound */
    SND_NOWAIT = 0x00002000, /* don't wait if the driver is busy */
    SND_ALIAS = 0x00010000, /* name is a registry alias */
    SND_ALIAS_ID = 0x00110000, /* alias is a predefined ID */
    SND_FILENAME = 0x00020000, /* name is file name */
    SND_RESOURCE = 0x00040004  /* name is resource name or atom */
   }

   [DllImport("winmm")]
   public static extern bool PlaySound( string szSound, IntPtr hMod, PlaySoundFlags flags );
  }
  internal class Helpers2
  {
   [Flags]
    public enum PlaySoundFlags : int
   {
    SND_SYNC = 0x0000,  /* play synchronously (default) */ //同步
    SND_ASYNC = 0x0001,  /* play asynchronously */ //异步
    SND_NODEFAULT = 0x0002,  /* silence (!default) if sound not found */
    SND_MEMORY = 0x0004,  /* pszSound points to a memory file */
    SND_LOOP = 0x0008,  /* loop the sound until next sndPlaySound */
    SND_NOSTOP = 0x0010,  /* don't stop any currently playing sound */
    SND_NOWAIT = 0x00002000, /* don't wait if the driver is busy */
    SND_ALIAS = 0x00010000, /* name is a registry alias */
    SND_ALIAS_ID = 0x00110000, /* alias is a predefined ID */
    SND_FILENAME = 0x00020000, /* name is file name */
    SND_RESOURCE = 0x00040004  /* name is resource name or atom */
   }

   [DllImport("winmm")]
   public static extern bool PlaySound( string szSound, IntPtr hMod, PlaySoundFlags flags );
  }

  public class Sound
  {
   public static void Play( string strFileName,int sign)
   {
    //Helpers1.PlaySound( strFileName, IntPtr.Zero, Helpers1.PlaySoundFlags.SND_FILENAME | Helpers1.PlaySoundFlags.SND_ASYNC );
    //Helpers1 Helpers1=new Helpers1();
    if(sign==1)
     Helpers1.PlaySound( strFileName, IntPtr.Zero, Helpers1.PlaySoundFlags.SND_FILENAME | Helpers1.PlaySoundFlags.SND_ASYNC |  Helpers1.PlaySoundFlags.SND_NODEFAULT);    
    else
     Helpers2.PlaySound( strFileName, IntPtr.Zero, Helpers2.PlaySoundFlags.SND_FILENAME | Helpers2.PlaySoundFlags.SND_ASYNC);    
   }
  }
 }
}
然后调用PlaySound.Sound.Play(@"..\..\music\background.WAV",1);
或者PlaySound.Sound.Play(@"..\..\music\front.WAV",2);
音乐类型为WAV格式

（二）通过输入的汉字或字母发音
需要添加引用using SpeechLib;
下载地址：https://files.cnblogs.com/holym/Interop.SpeechLib.rar
    SpVoice Voice = new SpVoice();
    SpeechVoiceSpeakFlags SpFlags = SpeechVoiceSpeakFlags.SVSFDefault;
    Voice.Voice = Voice.GetVoices(string.Empty, string.Empty).Item(024);    //其中3为中文，024为英文
   Voice.Speak("alarm",SpFlags);
   Voice.Voice = Voice.GetVoices(string.Empty, string.Empty).Item(3);
   Voice.Speak("备容量系统有问题",SpFlags);

（三）发出一阵鸣音
using System.Runtime.InteropServices;

[DllImport("kernel32.dll")]
　　　 public static extern bool Beep(int frequency, int duration);

System.Random r = new Random();
for(int i = 0; i < 10000; i++) 
{
     int c = r.Next(10000);　　　　　　
     Beep(0, 100);
 }