ตอนที่ 8 : การทำ Authentication in Azure Mobile Services ด้วย Windows Phone

private MobileServiceUser user;
private async System.Threading.Tasks.Task Authenticate()
{
    while (user == null)
    {
        string message;
        try
        {
            user = await App.MobileService
                .LoginAsync(MobileServiceAuthenticationProvider.Facebook);
            message =
                string.Format("You are now logged in - {0}", user.UserId);
        }
        catch (InvalidOperationException)
        {
            message = "You must log in. Login Required";
        }


    MessageBox.Show(message);
}


}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Navigation;
using Microsoft.Phone.Controls;
using Microsoft.Phone.Shell;
using myPhoneApp.Resources;

using Microsoft.WindowsAzure.MobileServices;
using Newtonsoft.Json;

namespace myPhoneApp
{

    public class MyMember
    {
        public int Id { get; set; }

        [JsonProperty(PropertyName = "name")]
        public string Name { get; set; }

        [JsonProperty(PropertyName = "email")]
        public string Email { get; set; }

        [JsonProperty(PropertyName = "status")]
        public string Status { get; set; }
    }

    public partial class MainPage : PhoneApplicationPage
    {

        private MobileServiceCollection<MyMember, MyMember> items;
        private IMobileServiceTable<MyMember> memberTable = App.MobileService.GetTable<MyMember>();
        private MobileServiceUser user;

        // Constructor
        public MainPage()
        {
            InitializeComponent();
            this.Loaded += MainPage_Loaded;
        }

        async void MainPage_Loaded(object sender, RoutedEventArgs e)
        {
            await Authenticate();
            RefreshMemberItems();
        }

        private async System.Threading.Tasks.Task Authenticate()
        {
            while (user == null)
            {
                string message;
                try
                {
                    user = await App.MobileService
                        .LoginAsync(MobileServiceAuthenticationProvider.Google);
                    message =
                        string.Format("You are now logged in - {0}", user.UserId);
                }
                catch (InvalidOperationException)
                {
                    message = "You must log in. Login Required";
                }

                MessageBox.Show(message);
            }


        }

        private async void RefreshMemberItems()
        {
            try
            {
                items = await memberTable.ToCollectionAsync();
            }
            catch (MobileServiceInvalidOperationException e)
            {
                MessageBox.Show(e.Message, "Error loading items", MessageBoxButton.OK);
            }

            myListItems.ItemsSource = items;
        }


    }

}