Creating the ViewModel

Next, add a new class file called MasterDetailViewModel in the ViewModels folder in the MvxFormsMasterDetailDemo.Core project. Change it to inherit from MvxViewModel class. Usually, we also need to use the NavigationService to implement the navigation in the ViewModel. So inject the instance of IMvxNavigationService by using dependency injection:

using MvvmCross.Navigation;
using MvvmCross.ViewModels;

namespace MvxFormsMasterDetailDemo.Core.ViewModels
{
    public class MasterDetailViewModel : MvxViewModel
    {
        readonly IMvxNavigationService _navigationService;

        public MasterDetailViewModel(IMvxNavigationService navigationService)
        {
            _navigationService = navigationService;
        }
    }
}