C#控制系统音量与静音

没啥难度，就是调了个API：

private const int APPCOMMAND_VOLUME_MUTE = 0x80000;
private const int APPCOMMAND_VOLUME_UP = 0x0a0000;
private const int APPCOMMAND_VOLUME_DOWN = 0x090000;
private const int WM_APPCOMMAND = 0x319;

[DllImport("user32.dll")]
public static extern IntPtr SendMessageW(IntPtr hWnd, int Msg, IntPtr wParam, IntPtr lParam);

public MainForm()
{
    InitializeComponent();
}

// 调高音量
private void btnIncrease_Click(object sender, EventArgs e)
{
    SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle, (IntPtr)APPCOMMAND_VOLUME_UP);  
}

// 降低音量
private void btnLower_Click(object sender, EventArgs e)
{
    SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle, (IntPtr)APPCOMMAND_VOLUME_DOWN); 
}

// 静音
private void chkMute_CheckedChanged(object sender, EventArgs e)
{
    SendMessageW(this.Handle, WM_APPCOMMAND, this.Handle, (IntPtr)APPCOMMAND_VOLUME_MUTE); 
}

点击这里下载上面的例程，名称为SoundControl，.NET Framework 4.0。