Xamarin / MAUI

using System;

using System.Collections.Generic;

using System.ComponentModel;

using System.Linq;

using System.Net.NetworkInformation;

using System.Runtime.CompilerServices;

using System.Text;

using System.Threading.Tasks;

namespace INRAETemplate.Services

{

    public class ConnexionService : INotifyPropertyChanged

    {

        private bool isINRAE;

        public bool IsINRAE

        {

            get => isINRAE;

            set => SetProperty(ref isINRAE, value);

        }

        // e est null à l'init

        public async Task SetIsConnected(ConnectivityChangedEventArgs e = null)

        {

            bool internetAccess = e is null ? Connectivity.NetworkAccess == NetworkAccess.Internet : e.NetworkAccess == NetworkAccess.Internet;

            // Test de l'accès au serveur

            try

            {

                await Task.Run(() =>

                {

                    IsINRAE = new Ping().Send("138.102.166.28").Status == IPStatus.Success || new Ping().Send("147.100.200.52").Status == IPStatus.Success;

                });

                IsINRAE = internetAccess && IsINRAE;

            }

            catch (Exception)

            {

                IsINRAE = false;

            }

        }

        public ConnexionService()

        {

            Connectivity.ConnectivityChanged += Connectivity_ConnectivityChanged;

            Task.Run(() => this.SetIsConnected()).Wait();

            // ou : new Action(async () => await SetIsConnected())();

        }

        ~ConnexionService()

        {

            Connectivity.ConnectivityChanged -= Connectivity_ConnectivityChanged;

        }

        public void Connectivity_ConnectivityChanged(object sender, ConnectivityChangedEventArgs e)

        {

            Task.Run(() => this.SetIsConnected(e)).Wait();

        }

        #region INPC

        public event PropertyChangedEventHandler PropertyChanged;

        protected bool SetProperty<T>(ref T storage, T value, [CallerMemberName] string propertyname = null)

        {

            if (Equals(storage, value)) return false;

            storage = value;

            OnPropertyChanged(propertyname);

            return true;

        }

        private void OnPropertyChanged([CallerMemberName] string propertyName = null)

        {

            PropertyChanged?.Invoke(this, new PropertyChangedEventArgs(propertyName));

        }

        #endregion

    }

}