Active Member
Posts: 7
Registered: ‎10-15-2013
Message 1 of 3 (335 Views)

Application.ShowModalDialog vs Application.ShowModelessDialog

335 Views, 2 Replies
10-15-2013 12:55 AM

Hi Guys,


I have a strange situation.


I am using Application.ShowModelessDislog to bring up a .NET DLL app inside AutoCAD.


In principal:


I get Data from a SQL source which wfills combo boxs

Then I press a button

and the Dislog Code Compares the Objects in my model (using a 3rd Party API)

Hides all parts that a correct and leaves behind incorrect.


If I use Application.ShowModalDialog everything works fine


If I use Application.ShowModelessDialog I get error during the processing.


Error:  .... has a command in progress. Hit enter to cancel or retry.


Any idea what is going on




*Expert Elite*
Posts: 961
Registered: ‎04-27-2009
Message 2 of 3 (312 Views)

Re: Application.ShowModalDialog vs Application.ShowModelessDialog

10-15-2013 06:38 AM in reply to: Stephan.Guympert

In general, modal dialog box is used in the context of a single document (MdiActiveDocument, usually), while modelesss dialog box is used in the application context and one needs to be handle the events when current document is chnaged (thus the document specific information shown in the modeless form also has to be changed, or the form has to be closed, in order to not confuse the users).


From your very brief description, it sounds like you need to lock the document if the coded action in the button-click handler needs to access the drawing database. Spmethign like:


private void MyButton_Click(...)


    Document dwg=......MdiActiveDocument;

    using (DocumentLock lck=dwg.LockDocument())





Active Member
Posts: 7
Registered: ‎10-15-2013
Message 3 of 3 (264 Views)

Re: Application.ShowModalDialog vs Application.ShowModelessDialog

10-20-2013 07:22 PM in reply to: norman.yuan

I will attempt to try this again but previsouly when I tried this, it made no difference.


I appricate the reply.



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