borepin/Borepin/Borepin/PageModel/MainPagePageModel.cs

using Prism.Mvvm;
using Prism.Navigation;
using System.Windows.Input;
using Xamarin.Forms;

namespace Borepin.PageModel
{
    public class MainPagePageModel : BindableBase
    {
        private INavigationService _NavigationService;

        public MainPagePageModel(INavigationService navigationService)
        {
            _NavigationService = navigationService;
            NavigateCommand = new Command<string>(NavigateCommandExecuted);
        }

        private ICommand _NavigationCommand;

        public ICommand NavigateCommand 
        {
            get => _NavigationCommand;
            set => SetProperty(ref _NavigationCommand, value);
        }

        private async void NavigateCommandExecuted(string view)
        {
            var result = await _NavigationService.NavigateAsync($"NavigationPage/{view}");
            if(!result.Success)
            {
                System.Diagnostics.Debugger.Break();
            }
        }
    }
}