WPF实现系统禁音的方法

方法1：

[DllImport("user32.dll", CharSet = CharSet.Auto, SetLastError = true)]
static extern IntPtr SendMessage(IntPtr hWnd, uint Msg, uint wParam, uint lParam);

const uint WM_APPCOMMAND = 0x319;
const uint APPCOMMAND_VOLUME_MUTE = 0x08;

然后调用：

SendMessage(new WindowInteropHelper(this).Handle, WM_APPCOMMAND, 0x200eb0, APPCOMMAND_VOLUME_MUTE * 0x10000);

方法2：

模拟按键的方式。

定义KeyController类：

public class KeyController
{
    #region bVk参数 常量定义

    public const byte vbKeyLButton = 0x1;    // 鼠标左键
    public const byte vbKeyRButton = 0x2;    // 鼠标右键
    public const byte vbKeyCancel = 0x3;     // CANCEL 键
    public const byte vbKeyMButton = 0x4;    // 鼠标中键
    public const byte vbKeyBack = 0x8;       // BACKSPACE 键
    public const byte vbKeyTab = 0x9;        // TAB 键
    public const byte vbKeyClear = 0xC;      // CLEAR 键
    public const byte vbKeyReturn = 0xD;     // ENTER 键
    public const byte vbKeyShift = 0x10;     // SHIFT 键
    public const byte vbKeyControl = 0x11;   // CTRL 键
    public const byte vbKeyAlt = 18;         // Alt 键  (键码18)
    public const byte vbKeyMenu = 0x12;      // MENU 键
    public const byte vbKeyPause = 0x13;     // PAUSE 键
    public const byte vbKeyCapital = 0x14;   // CAPS LOCK 键
    public const byte vbKeyEscape = 0x1B;    // ESC 键
    public const byte vbKeySpace = 0x20;     // SPACEBAR 键
    public const byte vbKeyPageUp = 0x21;    // PAGE UP 键
    public const byte vbKeyEnd = 0x23;       // End 键
    public const byte vbKeyHome = 0x24;      // HOME 键
    public const byte vbKeyLeft = 0x25;      // LEFT ARROW 键
    public const byte vbKeyUp = 0x26;        // UP ARROW 键
    public const byte vbKeyRight = 0x27;     // RIGHT ARROW 键
    public const byte vbKeyDown = 0x28;      // DOWN ARROW 键
    public const byte vbKeySelect = 0x29;    // Select 键
    public const byte vbKeyPrint = 0x2A;     // PRINT SCREEN 键
    public const byte vbKeyExecute = 0x2B;   // EXECUTE 键
    public const byte vbKeySnapshot = 0x2C;  // SNAPSHOT 键
    public const byte vbKeyDelete = 0x2E;    // Delete 键
    public const byte vbKeyHelp = 0x2F;      // HELP 键
    public const byte vbKeyNumlock = 0x90;   // NUM LOCK 键

    //常用键 字母键A到Z
    public const byte vbKeyA = 65;
    public const byte vbKeyB = 66;
    public const byte vbKeyC = 67;
    public const byte vbKeyD = 68;
    public const byte vbKeyE = 69;
    public const byte vbKeyF = 70;
    public const byte vbKeyG = 71;
    public const byte vbKeyH = 72;
    public const byte vbKeyI = 73;
    public const byte vbKeyJ = 74;
    public const byte vbKeyK = 75;
    public const byte vbKeyL = 76;
    public const byte vbKeyM = 77;
    public const byte vbKeyN = 78;
    public const byte vbKeyO = 79;
    public const byte vbKeyP = 80;
    public const byte vbKeyQ = 81;
    public const byte vbKeyR = 82;
    public const byte vbKeyS = 83;
    public const byte vbKeyT = 84;
    public const byte vbKeyU = 85;
    public const byte vbKeyV = 86;
    public const byte vbKeyW = 87;
    public const byte vbKeyX = 88;
    public const byte vbKeyY = 89;
    public const byte vbKeyZ = 90;

    //数字键盘0到9
    public const byte vbKey0 = 48;    // 0 键
    public const byte vbKey1 = 49;    // 1 键
    public const byte vbKey2 = 50;    // 2 键
    public const byte vbKey3 = 51;    // 3 键
    public const byte vbKey4 = 52;    // 4 键
    public const byte vbKey5 = 53;    // 5 键
    public const byte vbKey6 = 54;    // 6 键
    public const byte vbKey7 = 55;    // 7 键
    public const byte vbKey8 = 56;    // 8 键
    public const byte vbKey9 = 57;    // 9 键


    public const byte vbKeyNumpad0 = 0x60;    //0 键
    public const byte vbKeyNumpad1 = 0x61;    //1 键
    public const byte vbKeyNumpad2 = 0x62;    //2 键
    public const byte vbKeyNumpad3 = 0x63;    //3 键
    public const byte vbKeyNumpad4 = 0x64;    //4 键
    public const byte vbKeyNumpad5 = 0x65;    //5 键
    public const byte vbKeyNumpad6 = 0x66;    //6 键
    public const byte vbKeyNumpad7 = 0x67;    //7 键
    public const byte vbKeyNumpad8 = 0x68;    //8 键
    public const byte vbKeyNumpad9 = 0x69;    //9 键
    public const byte vbKeyMultiply = 0x6A;   // MULTIPLICATIONSIGN(*)键
    public const byte vbKeyAdd = 0x6B;        // PLUS SIGN(+) 键
    public const byte vbKeySeparator = 0x6C;  // ENTER 键
    public const byte vbKeySubtract = 0x6D;   // MINUS SIGN(-) 键
    public const byte vbKeyDecimal = 0x6E;    // DECIMAL POINT(.) 键
    public const byte vbKeyDivide = 0x6F;     // DIVISION SIGN(/) 键


    //F1到F12按键
    public const byte vbKeyF1 = 0x70;   //F1 键
    public const byte vbKeyF2 = 0x71;   //F2 键
    public const byte vbKeyF3 = 0x72;   //F3 键
    public const byte vbKeyF4 = 0x73;   //F4 键
    public const byte vbKeyF5 = 0x74;   //F5 键
    public const byte vbKeyF6 = 0x75;   //F6 键
    public const byte vbKeyF7 = 0x76;   //F7 键
    public const byte vbKeyF8 = 0x77;   //F8 键
    public const byte vbKeyF9 = 0x78;   //F9 键
    public const byte vbKeyF10 = 0x79;  //F10 键
    public const byte vbKeyF11 = 0x7A;  //F11 键
    public const byte vbKeyF12 = 0x7B;  //F12 键

    #endregion

    #region 引用win32api方法

    /// <summary>
    /// 导入模拟键盘的方法
    /// </summary>
    /// <param name="bVk" >按键的虚拟键值</param>
    /// <param name= "bScan" >扫描码，一般不用设置，用0代替就行</param>
    /// <param name= "dwFlags" >选项标志：0：表示按下，2：表示松开</param>
    /// <param name= "dwExtraInfo">一般设置为0</param>
    [DllImport("user32.dll")]
    public static extern void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);

    #endregion
}

然后模拟按钮：

KeyController.keybd_event(173, 0, 0, 0);
Thread.Sleep(50);
KeyController.keybd_event(173, 0, 2, 0);