AppInitialization.cs

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using System;
using System.Threading.Tasks;
using Microsoft.Practices.ServiceLocation;
using PhotoSharingApp.Universal.Models;
using PhotoSharingApp.Universal.Services;

namespace PhotoSharingApp.Universal.Lifecycle
{
    /// <summary>
    /// Helper class doing app initializations.
    /// </summary>
    public class AppInitialization
    {
        /// <summary>
        /// Does initialization tasks:
        /// 1. Restore user sign-in
        /// 2. Retrieving/setting service config
        /// </summary>
        /// <returns></returns>
        public static async Task DoInitializations()
        {
            // Sign/In and get current user
            var photoService = ServiceLocator.Current.GetInstance<IPhotoService>();

            try
            {
                // Try to restore sign in status
                await photoService.RestoreSignInStatusAsync();
            }
            catch (Exception)
            {
                // Do nothing: user will have to manually re-sign in.
            }

            try
            {
                var config = await photoService.GetConfig();
                AppEnvironment.Instance.SetConfig(config);
            }
            catch (Exception)
            {
                // Setting default config
                AppEnvironment.Instance.SetConfig(new DefaultConfig());
            }
        }
    }
}