static SDService()
{
Validator = DefaultValidator;
// Create an event handler to detect when a drive is added or removed
Watcher = new ManagementEventWatcher();
WqlEventQuery query = new WqlEventQuery("SELECT * FROM __InstanceOperationEvent WITHIN 2 WHERE TargetInstance ISA 'Win32_LogicalDisk' AND TargetInstance.Description = \"Removable disk\"");
Watcher.EventArrived += new EventArrivedEventHandler((s, e) =>
{
string driveName = ((ManagementBaseObject)e.NewEvent["TargetInstance"]).Properties["DeviceID"].Value.ToString();
DriveInfo actedDrive = new DriveInfo(driveName);
DirectoryInfo actedDriveRoot = FindRootForSd(actedDrive);
if (actedDrive.IsReady)
{
if (CurrentDrive != null && CurrentDrive.Name == actedDrive.Name)
{
OnSDRemoved?.Invoke(SDEffectiveRoot);
}
if (Validator(actedDriveRoot))
{
CurrentDrive = actedDrive; // set current drive so the event handler *could* access it directly, but why tho
SDRoot = CurrentDrive.RootDirectory;
SDEffectiveRoot = actedDriveRoot;
OnSDPluggedIn?.Invoke(SDEffectiveRoot);
}
}
else if (CurrentDrive != null) // if a drive hasn't been found to begin with, no need to check what was removed
{
DirectoryInfo currentDrive = new DirectoryInfo(CurrentDrive.Name);
if (currentDrive.Name == actedDrive.Name) // was the removed drive the one we found?
{
OnSDRemoved?.Invoke(SDEffectiveRoot); // Allow the handler read the current drive before we clear it
CurrentDrive = null;
SDRoot = null;
SDEffectiveRoot = null;
}
}
});
Watcher.Query = query;
}
public static void ResetHandlers()
{
// Clear event handlers
if (OnSDPluggedIn != null)
{
foreach (Delegate d in OnSDPluggedIn.GetInvocationList())
{
OnSDPluggedIn -= (SDChangedEventHandler)d;
}
}
if (OnSDRemoved != null)
{
foreach (Delegate d in OnSDRemoved.GetInvocationList())
{
OnSDRemoved -= (SDChangedEventHandler)d;
}
}
// Reset validator to default
Validator = DefaultValidator;
}