using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;

namespace VJSDN.Tech.Audio
{
   /// <summary>
   /// SOURCE CODE FROM THE WEBSITE.
   /// LAST UPDATE:WWW.CSFRAMEWORK.COM C/S框架网
   /// </summary>
   public class SoundControl
   {
      #region declarations
      
      const int MAXPNAMELEN = 32;
      const int MIXER_SHORT_NAME_CHARS = 16;
      const int MIXER_LONG_NAME_CHARS = 64;
      
      [Flags]
      enum MIXERLINE_LINEF : uint
      {
         ACTIVE = 0x00000001,
         DISCONNECTED = 0x00008000,
         SOURCE = 0x80000000
      }
     
.....请下载附件

private void btnIsMute_Click(object sender, EventArgs e)
{
   //获取混音设备
   SoundControl.MixerInfo mi = SoundControl.GetMixerControls();
   
   //检查是否静音状态
   bool ret = SoundControl.IsMuted(mi);
   if (ret)
      MessageBox.Show("系统是静音状态!");
   else
      MessageBox.Show("可以播放mp3啦!");
}