C# Update Combobox when new drawing opens in the same session

[GrahamB8]

Hi,

I'm in the middle of developing an application that reads the projectname variable in a drawing and checks the value from the items within a combobox.

This works fine when I start the appliction but If I open a new drawing from within the same session of AutoCAD I cant figure out how to get the item to automatically change.

            string currProject = GlobalVariables.currProject;
            comboBox1.SelectedIndex = comboBox1.FindStringExact(currProject);

I understand that I need a new method but I dont want to use a button click or other user interaction how do I have the value of the combobox update when the user opens a new drawing or starts a new drawing from the same session of AutoCAD?

Thanks

Graham

[SENL1362 · Accepted solution]

Graham,

Do you know how to use Events?

The Document Created event might be the one you're looking for, like the pseudo sample below.

You also might use the Document BecameCurrent or Document Activated events in order to set the current ProjectNr equal to the one that belongs to the current drawing

See attached screenshot where the Palette Label contents gets updated when switching Active documents.

public class AppMgr : IExtensionApplication

{

   void IExtensionApplication.Initialize()

   {

        Application.DocumentManager.DocumentCreated += DM_DocumentCreated;

...

void _bacAcadDocs_DocumentCreated(object sender, DocumentCollectionEventArgs e)

{

     //if Combo is visible

     //    Populate youre Combo

[_gile]

Hi,

What about handling DocumentCollection.DocumentActivated event.

Edit: @SENL1362 replied while I was typing.

I think DocumentActivated is a better way because it fires both when a new document is created and when the user switch from an opened document to another one.

[SENL1362]

Agree, that's why my reference count for the Created Event==0 🙂

[GrahamB8]

Yes that looks to be exactly what I need to learn, thanks a lot for your replies guys!