Initial Upgrade to .NET Core 2.0 (#50)

* Ardalis/upgrade1 (#44)

* Upgrading to netcore 2.0
Updating repository to support async options and refactoring to use it.

* Starting work on tracking customer orders feature.

* Cleaning up some bugs
Working on basket view component implementation

* Fixing up styles, especially for basket in header.

* Adding Order Features (#47)

* Working on order model binding from checkout page - WIP

* Small layout tweaks (#43)

* Updating quantities implemented.

* Fixed basket widget count

* Order History (#49)

* working on creating and viewing orders.
* Working on wiring up listing of orders
* List orders page works as expected. Needed to support ThenInclude scenarios. Currently using strings.

src/Web/ViewComponents/Basket.cs

@@ -0,0 +1,52 @@
+using ApplicationCore.Interfaces;
+using Infrastructure.Identity;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.eShopWeb.ViewModels;
+using System;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Web.ViewComponents
+{
+    public class Basket : ViewComponent
+    {
+        private readonly IBasketService _basketService;
+        private readonly SignInManager<ApplicationUser> _signInManager;
+
+        public Basket(IBasketService basketService,
+                        SignInManager<ApplicationUser> signInManager)
+        {
+            _basketService = basketService;
+            _signInManager = signInManager;
+        }
+
+        public async Task<IViewComponentResult> InvokeAsync(string userName)
+        {
+            var vm = new BasketComponentViewModel();
+            vm.ItemsCount = (await GetBasketViewModelAsync()).Items.Sum(i => i.Quantity);
+            return View(vm);
+        }
+
+        private async Task<BasketViewModel> GetBasketViewModelAsync()
+        {
+            if (_signInManager.IsSignedIn(HttpContext.User))
+            {
+                return await _basketService.GetOrCreateBasketForUser(User.Identity.Name);
+            }
+            string anonymousId = GetBasketIdFromCookie();
+            if (anonymousId == null) return new BasketViewModel();
+            return await _basketService.GetOrCreateBasketForUser(anonymousId);
+        }
+
+        private string GetBasketIdFromCookie()
+        {
+            if (Request.Cookies.ContainsKey(Constants.BASKET_COOKIENAME))
+            {
+                return Request.Cookies[Constants.BASKET_COOKIENAME];
+            }
+            return null;
+        }
+    }
+}