Adding Razor Pages Version (#60)

* In progress copying code into new RP project
Cleaning up namespaces and whitespace in original Web project

* Cleaning up some more namespaces

* Removing unused page.

* Index page loads correctly.

* Fixing up paging.

* Moving views; getting ready to convert to RPs

* Auto stash before merge of "master" and "origin/master"

Basket and Checkout pages wired up

* WIP on Account pages

* Working on signin/signout

* Working on auth

* Getting order history working
Fixing auth bug

* Fixing Checkout issue

* Fixing link

src/WebRazorPages/ViewComponents/Basket.cs

@@ -0,0 +1,51 @@
+using Infrastructure.Identity;
+using Microsoft.AspNetCore.Http;
+using Microsoft.AspNetCore.Identity;
+using Microsoft.AspNetCore.Mvc;
+using Microsoft.eShopWeb.RazorPages.Interfaces;
+using Microsoft.eShopWeb.RazorPages.ViewModels;
+using System.Linq;
+using System.Threading.Tasks;
+
+namespace Microsoft.eShopWeb.RazorPages.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;
+        }
+    }
+}