WPF Combobox - How to fill in using MVVM

Question

I’m having doubts about how popular a WPF Combobox using the MVVM standard. Here at Stackoverflow there is a similar question to mine, however, has not been answered (I would like a brief explanation of how to fill a combobox in MVVM standard).

I researched and saw that people mixed a little the Persistence layer with the View (code-Behind). I believe they are not obeying the MVVM.

I wanted to know how to best list items in one ComboBox that are in the database using the MVVM standard.

ps.: If I am wrong about the MVVM standard, please explain why.

Answer 1

Hello!

I use the Viewmodel to assemble the list of items I want to popular the combobox.

For example:

<ComboBox ItemsSource="{Binding ListaItens}" SelectedItem="{Binding ItemSelecionado}" />

The variables 'Listitems' and 'Itemselected' are properties of Viewmodel of any type. The 'Itemselected' can also be some attribute of an object.

Hugs!