const int WM_DEVICECHANGE = 0x2190;const int DBT_DEVICEARRIVAL = 0x8000;const int DBT_DEVICEREMOVECOMPLETE = 0x8004;protected override void WndProc(ref Message m){ try {  //if (m.Msg == WM_DEVICECHANGE)  //{   switch (m.WParam.ToInt32())   {    case DBT_DEVICEARRIVAL:  // U盤插入     DriveInfo[] s = DriveInfo.GetDrives();     foreach (DriveInfo drive in s)     {      if (drive.DriveType == DriveType.Removable)      {       Console.WriteLine("USB插入");       break;      }     }     break;    case DBT_DEVICEREMOVECOMPLETE: //U盤卸載     //     Console.WriteLine("USB卸載");     break;    default:     break;   }  //} } catch (Exception ex) {  MessageBox.Show(ex.Message); } base.WndProc(ref m);}