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1 using System.Runtime.InteropServices; 2     public partial class Form1 : Form 3     {         4         private const int APPCOMMAND_VOLUME_MUTE = 0x80000; 5         private const int APPCOMMAND_VOLUME_UP = 0xA0000; 6         private const int APPCOMMAND_VOLUME_DOWN = 0x90000; 7         private const int WM_APPCOMMAND = 0x319; 8         [DllImport("user32.dll")] 9         public static extern IntPtr SendMessageW(IntPtr hWnd, int Msg,10             IntPtr wParam, IntPtr lParam);11         public Form1()12         {13             InitializeComponent();14         }15 16 17         private void button1_Click(object sender, EventArgs e)18         {19             SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle,20                 (IntPtr)APPCOMMAND_VOLUME_MUTE);21         }22 23 24         private void button2_Click(object sender, EventArgs e)25         {26             SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle,27                 (IntPtr)APPCOMMAND_VOLUME_DOWN);28         }29 30 31         private void button3_Click(object sender, EventArgs e)32         {33             SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle,34                 (IntPtr)APPCOMMAND_VOLUME_UP);35         }36 37     }38 //button1_click事件让电脑系统静音；button2_click事件实现音量的减少；button3_click事件pc系统音量的添加。