Creating the ItemViewModel class

ItemViewModel represents the to-do list item in a view that can be used to create new items and to edit existing items:

1. In the ViewModels folder, create a class called ItemViewModel.
2. Add the following code:

using DoToo.Models;
using DoToo.Repositories;
using System;
using System.Windows.Input;
using Xamarin.Forms;

namespace DoToo.ViewModels
{
    public class ItemViewModel : ViewModel
    {
        private readonly TodoItemRepository repository;

        public ItemViewModel(TodoItemRepository repository)
        {
            this.repository = repository;
        } 
    }
}

The pattern is the same as for the previous two ViewModel classes:

• We use dependency injection to pass the TodoItemRepository class to the ViewModel object.
• We use inheritance from the ViewModel base class to add the common features defined by the base class