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

namespace SoundPlay
{
    public class Sound
    {
        private byte[] m_soundBytes;
        private enum Flags
        {
            SND_SYNC = 0x0000,  /* play synchronously (default) */
            SND_ASYNC = 0x0001,  /* play asynchronously */
            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("CoreDll.DLL", EntryPoint = "PlaySound", SetLastError = true)]
        private extern static int MobilePlaySound(string szSound, IntPtr hMod, int flags);//播放外部声音文件

[DllImport("CoreDll.DLL", EntryPoint = "PlaySound", SetLastError = true)]
        private extern static int MoiblePlaySoundBytes(byte[] szSound, IntPtr hMod, int flags);//播放嵌入声音资源

/// <summary>
        /// Construct the Sound object to play sound data from the specified stream.
        /// </summary>
        public Sound(Stream stream)
        {
            // read the data from the stream
            m_soundBytes = new byte[stream.Length];
            stream.Read(m_soundBytes, 0, (int)stream.Length);
        }
        /// <summary>
        /// 从一个声音byte流构造函数Sound
        /// </summary>
        /// <param name="snd"></param>
        public Sound(byte[] snd)
        {
            m_soundBytes = snd;
        }
        /// <summary>
        /// 构造一个空Sound函数，此函数用于播放外部文件
        /// </summary>
        public Sound()
        {
        }

/// <summary>
        /// Play the sound File播放外部文件的Play方法
        /// </summary>
        public void Play(string filename)
        {
            MobilePlaySound(filename, IntPtr.Zero, (int)(Flags.SND_ASYNC | Flags.SND_FILENAME));

}
        /// <summary>
        /// Play The Stream Sound,此方法应该对应从Byte和Stream构造的Sound
        /// 注意，它的Flags设置为SND_MEMORY，因为我们的声音文件已经转换到内存中了
        /// </summary>
        public void Play()
        {
            MoiblePlaySoundBytes(m_soundBytes, IntPtr.Zero, (int)(Flags.SND_ASYNC | Flags.SND_MEMORY));
        }
    }
}

按钮代码
 private void btnOpen_Click(object sender, EventArgs e)
        {
            using (OpenFileDialog ofd = new OpenFileDialog())
            {
                if (ofd.ShowDialog() == DialogResult.OK)
                {
                    lblFileName.Text = ofd.FileName;
                }
            }
        }

private void btnPlay_Click(object sender, EventArgs e)
        {
            Sound sound = new Sound();
            sound.Play(lblFileName.Text);
        }