CODEWITHSUNDEEP
vb.netwinformsoop
Aimnox
Aimnox

Reputation: 899

How does visual know what form I want?

So I have the folowing code for a form.

Public Class tab
     Public personas, formaciones, avisos, cursos As List(Of Object)
     [Lots of Code]
End class

On another form I want the formaciones List, so I can just:

ListBox1.DataSource = tab.formaciones

And it works, perfectly.

But.. How?

tab is a class, not an instance of it, but vb is able to understand that I want the instance of that class.

What happen if there are mor than one tab open? How does it work internally?

Upvotes: 0

Views: 47

Answers (1)

Stefano d'Antonio
Stefano d'Antonio

Reputation: 6172

This is part of a default application framework that is enabled when creating VB.NET WinForms applications.

Its intent was to help the migration from VB6 so it creates singletons of each form.

If you want different instances, you can disable/ignore the framework and write your own start up methods.

More details:

Singleton forms: https://msdn.microsoft.com/en-us/library/ms233839.aspx

Enable/disable: https://msdn.microsoft.com/en-us/library/17k74w0c(v=vs.100).aspx

Full article: https://visualstudiomagazine.com/articles/2007/10/01/enable-the-application-framework-in-vb.aspx

Upvotes: 1

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