Veto a particular command in AutoCAD

By Virupaksha Aithal

You can Veto any command inside “DocumentCollection.DocumentLockModeChanged” event. This event is called just before AutoCAD start processing the command. Refer below code which prevents the quitting of AutoCAD.

[CommandMethod("AddVetoToQuit")]
static public void AddVetoToQuit()
{
    DocumentCollection doc = Application.DocumentManager;
    doc.DocumentLockModeChanged += 
        new DocumentLockModeChangedEventHandler(
                            doc_DocumentLockModeChanged);
 
}
 
[CommandMethod("RemoveVetoToQuit")]
static public void RemoveVetoToQuit()
{
    DocumentCollection doc = Application.DocumentManager;
    doc.DocumentLockModeChanged -= 
                new DocumentLockModeChangedEventHandler(
                               doc_DocumentLockModeChanged);
 
}
 
static void doc_DocumentLockModeChanged(object sender, 
                            DocumentLockModeChangedEventArgs e)
{
    if (string.Compare(e.GlobalCommandName, "QUIT", true) == 0)
    {
        e.Veto();
    }
}