Question

Let’s say I have following models:

class Worker
{
    int Id;
    string firstname;
    string lastname;    
}

class Department
{
    string title;
    string description; 
    List<Worker> workers;
}

I want to display, on UI, department’s title,description and list of workers inside listbox (in listbox I want to display only firstname and lastname).
Do I need to create ONE viewmodel that will wrap this relation or I must I create a viewmodel for every model that I have?

Answer 1

You can create on ViewModel Which wrap both of them like:

namespace XXXX.ViewModel
{
public class MainViewModel : ViewModelBase
{
    private int _id;
    private string _total;
    private string _description;

    private ObservableCollection<Worker> _workers;

    public int Id
    {
        get { return _id; }
        set
        {
            if (value == _id) return;
            _id = value;
            RaisePropertyChanged("Id");
        }
    }
    public string Total
    {
        get { return _total; }
        set
        {
            if (value == _total) return;
            _total = value;
            RaisePropertyChanged("Total");
        }
    }
    public string Description
    {
        get { return _description; }
        set
        {
            if (value == _description) return;
            _description = value;
            RaisePropertyChanged("Description");
        }
    }
    public ObservableCollection<Worker> Workers
    {
        get { return _workers; }
        set
        {
            if (value == _workers) return;
            _workers = value;
            RaisePropertyChanged("Workers");
        }
    }

    //****************** You Logic *************************
    public MainViewModel()
    {
        Department department = new Department();
    }
    //****************** You Logic *************************
}
}