NTMessageBoxSimple not halting script

[ramckay]

I need to check the data in a database for errors before using the data. I've added an NTMessageBoxSimple which will be displayed when an error in the database is found. I assumed that the messagebox would display, halt the script progress, allow me to correct any discrepancies, and the proceed with script. Instead the script runs past the NTMessageBoxSimple.Show and the script halts with an out of bounds exception message when the database error is encountered and then the NTMessageBox displays. Is there a way to force the MessgeBox to display when the NTMessageBoxSimple.Show() line is hit? The code is in an AddOn and I get a compile error when I try to add ForceRefresh().
Thanks in advance,

                            if (
                                entry.IsEntry   != entry.IsEntryStrategy  ||
                                entry.IsExit    != entry.IsExitStrategy    ||
                                entry.Name      == null      
                                )
​                            {
                                   cc.Dispatcher.InvokeAsync(new Action(() =>
                                  {
                                           NinjaTrader.Gui.Tools.NTMessageBoxSimple.Show(Window.GetWindow(cc.OwnerChart as DependencyObject),
                                            "\r\n" +
                                            "                              Discrepancy in DataBase\n\n" +
                                            "                                   Check ID # " + ID,
                                            "               AddOns.Methods.getInstList() Line " + LN(),
                                            MessageBoxButton.OK, MessageBoxImage.Error);
                                   }));​
                            }
​

[NinjaTrader_ChelseaB]

Hello ramckay,

The recommended approach would not be to halt the thread but to trigger an action when the user clicks ok (the .Show() method returns a MessageBoxResult value).

The calling method would return after showing the message box this so it's no longer doing anything.

This would thus wait for the user to click OK before continuing actions.

You could also set a bool variable just before showing the message box to suppress any other asynchronous methods running from a different thread and set this back once the user clicks OK.

[ramckay]

Hi Chelsea,
I'm trying to get the message box to show when a condition is met. Initially I tried .Show(); System.Environment.Exit(0); I was expecting the message box to show. It would contain information about what needed to be fixed in the database which I could resolve and then restart the app. What happens is that the MessageBox never shows and NT shuts down. I tried putting the 'System.Environment.Exit(0);' line in another method and got the same results - program shuts down and messagebox never shows.
Thanks

[NinjaTrader_ChelseaB]

Hello ramckay,

It sounds like you are shutting down the application.

If the application is shutdown the message box isn't going to show.

If you want the message box to show don't shut down the application.

[ramckay]

Chelsea,

It sounds like you are shutting down the application.

If the application is shutdown the message box isn't going to show.

No. What I'm trying to do is have the messagebox show when a condition is met. Can an NT script be halted with a messagebox? I showed the code to shut down the app. I didn't show the the other 5 efforts I tried when attempting to get the message box to show and stop the scripts progress. Is there a way to do this?
Thanks

[NinjaTrader_ChelseaB]

Hello,

You stated in post # 3 you are calling System.Environment.Exit(0); to shutdown the application.

Don't.

"Can an NT script be halted with a messagebox?"

Not that I know of. You are calling this on a different thread that runs asynchronously.


"I showed the code to shut down the app."

Right. I'm directing you to not shutdown the NinjaTrader application.

"I didn't show the the other 5 efforts I tried when attempting to get the message box to show and stop the scripts progress. Is there a way to do this?"

The recommended approach would not be to halt the thread but to trigger an action when the user clicks ok.
The desired outcome of nothing happening until the user clicks ok would be achieved.

[ramckay]

Hello,
The crux of the matter here is what initiates the display of the MessageBox and can I somehow control it?
Thanks

[NinjaTrader_ChelseaB]

Hello ramckay,

You can control when the method is called. But that I know of you wouldn't be able to halt the NinjaScript while waiting for the UI thread code to complete. They are asynchronous.

[ramckay]

ChelseaB,
I did that and it works well.
Thanks