检测USB设备的插入拔出（C#）

  public partial class Form1 : Form

    
     {
    
     [DllImport("user32.dll")]
    
     public static extern void keybd_event(byte bVk, byte bScan, int dwFlags, int dwExtraInfo);   
    
     public Form1()
    
     {
    
         InitializeComponent();
    
     }
    
  
    
    
    
  
    
  
    
  
    
    
    
     private int cc;
    
     private void timer1_Tick(object sender, EventArgs e)
    
     {
    
         var scope = new ManagementScope();
    
         var query = new SelectQuery("select * from Win32_USBControllerDevice");