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ViewModel/DetailedViewModel.cs

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+// Huh... no nic nie ma, co tu chcesz? 
+// ༼ つ ◕_◕ ༽つ

ViewModel/MainViewModel.cs

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+using System.Collections.ObjectModel;
+using Navigation_Between.Interface;
+using Navigation_Between.Model;
+using Navigation_Between.Service;
+using Navigation_Between.View;
+
+namespace Navigation_Between.ViewModel;
+
+public class MainViewModel {
+    public ObservableCollection<User> Users { get; set; }
+    public Command<User> SelectUserCommand { get; }
+
+    private readonly INavigation _navigation;
+    private readonly IAlertService _alertService;
+    private readonly DataService _dataService;
+
+    public MainViewModel(INavigation navigation, DataService dataService, IAlertService alertService) {
+        _navigation = navigation;
+        _dataService = dataService;
+        _alertService = alertService;
+
+        Users = new ObservableCollection<User>(_dataService.GetUsers());
+        SelectUserCommand = new Command<User>(OnItemSelected);
+    }
+
+    async void OnItemSelected(User user){
+        if(user != null)
+            await _navigation.PushAsync(new DetailedPage(user));
+    }
+}