实现效果：
知识运用：
API函数 mciSendString //函数用来向媒体控制接口设备发送命令 声明如下
[DllImport("winmm.dll",EntryPoint="mciSendString")]
public static extern int mciSendString(string IpstrCommand,string IpstrReturnString,System.UInt16 uReturnLength,System.IntPtr HwndCallback);
实现代码：
[DllImport("winmm.dll",EntryPoint="mciSendString")]
public static extern int mciSendString(string IpstrCommand,string IpstrReturnString,System.UInt16 uReturnLength,System.IntPtr HwndCallback);
private void button1_Click(object sender, EventArgs e)
{
mciSendString("Set cdaudio door open wait","",0,this.Handle); //打开CD_ROM
}
private void button2_Click(object sender, EventArgs e)
{
mciSendString("Set cdaudio door closed wait", "", 0, this.Handle); //关闭CD_ROM
}
原文：https://www.cnblogs.com/feiyucha/p/10278221.html