Exercise Files

Ch06/06_04_Begin/Common/App.config

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+<?xml version="1.0" encoding="utf-8"?>
+<configuration>
+  <configSections>
+    <!-- For more information on Entity Framework configuration, visit http://go.microsoft.com/fwlink/?LinkID=237468 -->
+    <section name="entityFramework" type="System.Data.Entity.Internal.ConfigFile.EntityFrameworkSection, EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" requirePermission="false" />
+  </configSections>
+  <entityFramework>
+    <defaultConnectionFactory type="System.Data.Entity.Infrastructure.LocalDbConnectionFactory, EntityFramework">
+      <parameters>
+        <parameter value="mssqllocaldb" />
+      </parameters>
+    </defaultConnectionFactory>
+    <providers>
+      <provider invariantName="System.Data.SqlClient" type="System.Data.Entity.SqlServer.SqlProviderServices, EntityFramework.SqlServer" />
+    </providers>
+  </entityFramework>
+</configuration>

Ch06/06_04_Begin/Common/Common.csproj

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+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="15.0" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{7709A0D8-F311-4A8E-9E5B-05ED694449AD}</ProjectGuid>
+    <OutputType>Library</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>HPlusSports</RootNamespace>
+    <AssemblyName>HPlusSports.Common</AssemblyName>
+    <TargetFrameworkVersion>v4.6.1</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="EntityFramework, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, processorArchitecture=MSIL">
+      <HintPath>..\packages\EntityFramework.6.2.0\lib\net45\EntityFramework.dll</HintPath>
+    </Reference>
+    <Reference Include="EntityFramework.SqlServer, Version=6.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089, processorArchitecture=MSIL">
+      <HintPath>..\packages\EntityFramework.6.2.0\lib\net45\EntityFramework.SqlServer.dll</HintPath>
+    </Reference>
+    <Reference Include="MediatR, Version=4.1.0.0, Culture=neutral, processorArchitecture=MSIL">
+      <HintPath>..\packages\MediatR.4.1.0\lib\net45\MediatR.dll</HintPath>
+    </Reference>
+    <Reference Include="System" />
+    <Reference Include="System.ComponentModel.DataAnnotations" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Models\Category.cs" />
+    <Compile Include="Models\EntityNotFoundException.cs" />
+    <Compile Include="Models\HPlusSportsDbContext.cs" />
+    <Compile Include="Models\HPlusSportsDbContext.SeedData.cs" />
+    <Compile Include="Models\Image.cs" />
+    <Compile Include="Models\Product.cs" />
+    <Compile Include="Models\ProductRating.cs" />
+    <Compile Include="Models\Review.cs" />
+    <Compile Include="Models\ShoppingCart.cs" />
+    <Compile Include="Models\ShoppingCartItem.cs" />
+    <Compile Include="Requests\UpdateProductRequest.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+    <Compile Include="Services\ProductUpdateService.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+    <None Include="packages.config" />
+  </ItemGroup>
+  <ItemGroup>
+    <EmbeddedResource Include="TestData.xml" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+</Project>

Ch06/06_04_Begin/Common/Models/Category.cs

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+using System.ComponentModel.DataAnnotations;
+
+namespace HPlusSports.Models
+{
+    public class Category
+    {
+        public long Id { get; set; }
+
+        [Required]
+        public string Key { get; set; }
+
+        [Required]
+        public string Name { get; set; }
+
+        public long? ImageId { get; set; }
+
+        public virtual Image Image { get; set; }
+    }
+}

Ch06/06_04_Begin/Common/Models/EntityNotFoundException.cs

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+using System;
+
+namespace HPlusSports
+{
+    public class EntityNotFoundException : ApplicationException
+    {
+        public object Id { get; }
+        public Type Type { get; }
+
+        public EntityNotFoundException(Type type, object id)
+          : base($"Entity ${id?.ToString()} of type ${type?.Name} not found.")
+        {
+            Type = type;
+            Id = id;
+        }
+    }
+
+    public class EntityNotFoundException<T> : EntityNotFoundException
+    {
+        public EntityNotFoundException(object id) : base(typeof(T), id)
+        {
+        }
+    }
+
+}

Ch06/06_04_Begin/Common/Models/HPlusSportsDbContext.SeedData.cs

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+using System;
+using System.Collections.Generic;
+using System.Data.Entity;
+using System.IO;
+using System.Linq;
+using System.Xml;
+using System.Xml.Linq;
+using HPlusSports.Models;
+using System.Text.RegularExpressions;
+
+namespace HPlusSports
+{
+    public class HPlusSportsDbContextInitializer
+        : DropCreateDatabaseIfModelChanges<HPlusSportsDbContext>
+    {
+        protected override void Seed(HPlusSportsDbContext context)
+        {
+            new SeedData().Populate(context);
+        }
+    }
+
+    internal class SeedData
+    {
+        static readonly Random Random = new Random(1);
+
+        public const string TestUserId = "demo@hplussports.com";
+
+        static readonly IList<string> UserIds =
+          Enumerable.Range(0, 10)
+            .Select(x => $"user{x}")
+            .Concat(new[] { TestUserId })
+            .ToArray();
+
+        public void Populate(HPlusSportsDbContext context)
+        {
+            var doc = ReadTestData();
+            Populate(context, doc);
+        }
+
+        internal void Populate(HPlusSportsDbContext context, XDocument doc)
+        {
+            var categories = doc.Descendants("Categories").Descendants("Category")
+              .Select(x => new Category
+              {
+                  Key = ToKey(x.Element("Name").Value),
+                  Name = x.Element("Name").Value,
+                  Image = new Image { Url = x.Element("ImageUrl").Value },
+              })
+              .ToArray();
+
+            context.Images.AddRange(categories.Select(x => x.Image));
+            context.SaveChanges();
+
+            context.Categories.AddRange(categories);
+            context.SaveChanges();
+
+            var products = doc.Descendants("Product")
+              .Select(x =>
+              {
+                  var product = new Product
+                  {
+                      CategoryId = categories.First(cat => cat.Name == x.Element("Category").Value).Id,
+                      Name = x.Element("Name").Value,
+                      Description = StripHtml(x.Element("Description").Value),
+                      MSRP = double.Parse(x.Element("MSRP").Value),
+                      Price = double.Parse(x.Element("Price").Value),
+                      SKU = x.Element("SKU").Value,
+                      Summary = x.Element("Summary").Value,
+                      LastUpdated = DateTime.UtcNow,
+                      LastUpdatedUserId = "admin@hplussports.com",
+                      ThumbnailImage = new Image { Url = x.Element("ThumbnailImageUrl").Value },
+                  };
+
+                  product.Images.Add(new Image { Url = x.Element("ImageUrl").Value });
+
+                  return product;
+              })
+              .ToArray();
+
+            context.Products.AddRange(products);
+            context.SaveChanges();
+
+            var reviews = context.Products.SelectMany(GenerateReviews);
+            context.Reviews.AddRange(reviews);
+            context.SaveChanges();
+        }
+
+        IEnumerable<Review> GenerateReviews(Product product)
+        {
+            return Enumerable.Range(0, Random.Next(10))
+              .Select(i =>
+                new Review
+                {
+                    SKU = product.SKU,
+                    UserId = UserIds[Random.Next(0, UserIds.Count)],
+                    Rating = Random.Next(3, 5),
+                });
+        }
+
+        private static string ToKey(string val)
+        {
+            return val
+              .Replace(" ", "-")
+              .Replace("--", "-")
+              .Replace("--", "-")
+              .ToLowerInvariant();
+        }
+
+        private static XDocument ReadTestData()
+        {
+            var set = new XmlReaderSettings
+            {
+                ConformanceLevel = ConformanceLevel.Fragment
+            };
+
+            using (var stream = typeof(SeedData).Assembly.GetManifestResourceStream("HPlusSports.TestData.xml"))
+            using (var reader = new StreamReader(stream))
+            {
+                return XDocument.Parse(reader.ReadToEnd());
+            }
+        }
+
+        private static string StripHtml(string source)
+        {
+            return
+                Regex.Replace(
+                    Regex.Replace(
+                        source,
+                        "<[^>]*>", 
+                        ""
+                    ),
+                    "&#[^;]*;",
+                    ""
+                )
+                .Trim();
+        }
+    }
+}

Ch06/06_04_Begin/Common/Models/HPlusSportsDbContext.cs

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+using System.Collections.Generic;
+using System.Data.Entity;
+using System.Linq;
+using HPlusSports.Models;
+
+namespace HPlusSports
+{
+    public class HPlusSportsDbContext : DbContext
+    {
+        public DbSet<Category> Categories { get; set; }
+        public DbSet<Image> Images { get; set; }
+        public DbSet<Product> Products { get; set; }
+        public DbSet<Review> Reviews { get; set; }
+        public DbSet<ShoppingCart> ShoppingCarts { get; set; }
+        public DbSet<ShoppingCartItem> ShoppingCartItems { get; set; }
+
+        public HPlusSportsDbContext()
+            : this("HPlusSports")
+        {
+        }
+
+        public HPlusSportsDbContext(string connectionName)
+            : base(connectionName)
+        {
+        }
+
+        public Product FindProductBySku(string sku)
+          => Products.FirstOrDefault(x => x.SKU == sku);
+
+        public ProductRating GetProductRating(string sku)
+        {
+            var reviews = Reviews.Where(x => x.SKU == sku);
+
+            return new ProductRating
+            {
+                SKU = sku,
+                Rating = reviews.Average(x => (double?)x.Rating),
+                ReviewCount = reviews.Count(),
+            };
+        }
+
+        public IQueryable<ProductRating> GetProductRatings(IEnumerable<string> skus)
+        {
+            return
+              Reviews
+                .Where(x => skus.Distinct().Contains(x.SKU))
+                .GroupBy(x => x.SKU)
+                .Select(reviews => new ProductRating
+                {
+                    SKU = reviews.Key,
+                    Rating = reviews.Average(x => x.Rating),
+                    ReviewCount = reviews.Count(),
+                });
+        }
+    }
+}

Ch06/06_04_Begin/Common/Models/Image.cs

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+namespace HPlusSports.Models
+{
+    public class Image
+    {
+        public long Id { get; set; }
+
+        public string Url { get; set; }
+
+        public byte[] Content { get; set; }
+
+        public string ContentType { get; set; }
+    }
+}

Ch06/06_04_Begin/Common/Models/Product.cs

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+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.ComponentModel.DataAnnotations.Schema;
+
+namespace HPlusSports.Models
+{
+    public class Product
+    {
+        public long Id { get; set; }
+
+        [Required]
+        public long CategoryId { get; set; }
+
+        [Required]
+        public string SKU { get; set; }
+
+        [Required]
+        public string Name { get; set; }
+
+        [Required]
+        [DataType(DataType.Text)]
+        public string Summary { get; set; }
+
+        [Required]
+        [DataType(DataType.MultilineText)]
+        public string Description { get; set; }
+
+        [Range(minimum: 0, maximum: double.MaxValue)]
+        [DataType(DataType.Currency)]
+        public double MSRP { get; set; }
+
+        [Range(minimum: 0, maximum: double.MaxValue)]
+        [DataType(DataType.Currency)]
+        public double Price { get; set; }
+
+        [Required]
+        [Display(Name = "Last Updated By")]
+        public DateTime LastUpdated { get; set; }
+
+        [Required]
+        [Display(Name = "Last Update Timestamp")]
+        public string LastUpdatedUserId { get; set; }
+
+        [NotMapped]
+        public virtual Category Category { get; set; }
+
+        public long? ThumbnailImageId { get; set; }
+        public virtual Image ThumbnailImage { get; set; }
+
+        public virtual ICollection<Image> Images { get; private set; }
+
+        public Product()
+        {
+            Images = new List<Image>();
+        }
+    }
+}

Ch06/06_04_Begin/Common/Models/ProductRating.cs

@@ -0,0 +1,9 @@
+namespace HPlusSports.Models
+{
+    public class ProductRating
+    {
+        public string SKU { get; set; }
+        public double? Rating { get; set; }
+        public int ReviewCount { get; set; }
+    }
+}

Ch06/06_04_Begin/Common/Models/Review.cs

@@ -0,0 +1,18 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace HPlusSports.Models
+{
+    public class Review
+    {
+        public long Id { get; set; }
+        public string UserId { get; set; }
+
+        public string SKU { get; set; }
+
+        [Range(minimum: 1, maximum: 5)]
+        public int Rating { get; set; }
+
+        [DataType(DataType.MultilineText)]
+        public string Comments { get; set; }
+    }
+}

Ch06/06_04_Begin/Common/Models/ShoppingCart.cs

@@ -0,0 +1,46 @@
+using System;
+using System.Collections.Generic;
+using System.ComponentModel.DataAnnotations;
+using System.Linq;
+
+namespace HPlusSports.Models
+{
+    public class ShoppingCart
+    {
+        public long Id { get; set; }
+        public string UserId { get; set; }
+
+        [DataType(DataType.Currency)]
+        public double Tax { get; set; }
+
+        [DataType(DataType.Currency)]
+        public double Shipping { get; set; }
+
+        [DataType(DataType.Currency)]
+        public double Total
+        {
+            get { return Subtotal + Tax + Shipping; }
+        }
+
+        public string Coupon { get; set; }
+
+        public virtual ICollection<ShoppingCartItem> Items { get; private set; }
+
+        [DataType(DataType.Currency)]
+        public double Subtotal
+        {
+            get { return Items.Sum(x => x.Total); }
+        }
+
+        public ShoppingCart()
+        {
+            Items = new List<ShoppingCartItem>();
+        }
+
+        public void Recalculate()
+        {
+            Shipping = Subtotal * 0.1;
+            Tax = Subtotal * 0.07;
+        }
+    }
+}

Ch06/06_04_Begin/Common/Models/ShoppingCartItem.cs

@@ -0,0 +1,37 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace HPlusSports.Models
+{
+    public class ShoppingCartItem
+    {
+        public long Id { get; set; }
+
+        [Required]
+        public string SKU { get; set; }
+
+        [Required]
+        public string Name { get; set; }
+
+        [Required]
+        [DataType(DataType.Currency)]
+        [Range(minimum: 0, maximum: double.MaxValue)]
+        public double MSRP { get; set; }
+
+        [DataType(DataType.Currency)]
+        [Range(minimum: 0, maximum: double.MaxValue)]
+        public double Price { get; set; }
+
+        [Range(minimum: 0, maximum: int.MaxValue)]
+        public int Quantity { get; set; }
+
+        [DataType(DataType.Currency)]
+        public double Total
+        {
+            get { return Price * Quantity; }
+        }
+
+        public ShoppingCartItem()
+        {
+        }
+    }
+}

Ch06/06_04_Begin/Common/Models/UpdateProductRequest.cs

@@ -0,0 +1,37 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace HPlusSports.Models
+{
+    public class UpdateProductRequest
+    {
+        [Required]
+        public long Id { get; set; }
+
+        [Required]
+        public long CategoryId { get; set; }
+
+        [Required]
+        public string SKU { get; set; }
+
+        [Required]
+        public string Name { get; set; }
+
+        [Required]
+        [DataType(DataType.Text)]
+        public string Summary { get; set; }
+
+        [Required]
+        [DataType(DataType.MultilineText)]
+        public string Description { get; set; }
+
+        [Range(minimum: 0, maximum: double.MaxValue)]
+        [DataType(DataType.Currency)]
+        public double MSRP { get; set; }
+
+        [Range(minimum: 0, maximum: double.MaxValue)]
+        [DataType(DataType.Currency)]
+        public double Price { get; set; }
+
+        public string LastUpdatedUserId { get; set; }
+    }
+}

Ch06/06_04_Begin/Common/Properties/AssemblyInfo.cs

@@ -0,0 +1,38 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("Common")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("Common")]
+[assembly: AssemblyCopyright("Copyright ©  2018")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible
+// to COM components.  If you need to access a type in this assembly from
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("7709a0d8-f311-4a8e-9e5b-05ed694449ad")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]
+
+[assembly: InternalsVisibleTo("HPlusSports.Tests")]

Ch06/06_04_Begin/Common/Requests/UpdateProductRequest.cs

@@ -0,0 +1,43 @@
+using System.ComponentModel.DataAnnotations;
+
+namespace HPlusSports.Requests
+{
+    public class UpdateProductResponse
+    {
+        public bool Success { get; set; }
+        public string Message { get; set; }
+    }
+
+    public class UpdateProductRequest : MediatR.IRequest<UpdateProductResponse>
+    {
+        [Required]
+        public long Id { get; set; }
+
+        [Required]
+        public long CategoryId { get; set; }
+
+        [Required]
+        public string SKU { get; set; }
+
+        [Required]
+        public string Name { get; set; }
+
+        [Required]
+        [DataType(DataType.Text)]
+        public string Summary { get; set; }
+
+        [Required]
+        [DataType(DataType.MultilineText)]
+        public string Description { get; set; }
+
+        [Range(minimum: 0, maximum: double.MaxValue)]
+        [DataType(DataType.Currency)]
+        public double MSRP { get; set; }
+
+        [Range(minimum: 0, maximum: double.MaxValue)]
+        [DataType(DataType.Currency)]
+        public double Price { get; set; }
+
+        public string LastUpdatedUserId { get; set; }
+    }
+}

Ch06/06_04_Begin/Common/Services/ProductUpdateService.cs

@@ -0,0 +1,80 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading;
+using System.Threading.Tasks;
+using HPlusSports.Requests;
+
+namespace HPlusSports.Services
+{
+    public class ProductUpdateService
+        : MediatR.IRequestHandler<UpdateProductRequest, UpdateProductResponse>
+    {
+        private readonly HPlusSportsDbContext _context;
+
+        public ProductUpdateService(HPlusSportsDbContext context)
+        {
+            _context = context;
+        }
+
+        public Task<UpdateProductResponse> Handle(UpdateProductRequest request, CancellationToken cancellationToken)
+        {
+            return Task.FromResult(Update(request));
+        }
+
+        public UpdateProductResponse Update(UpdateProductRequest request)
+        {
+            var existing = _context.Products.Find(request.Id);
+
+            if (existing == null)
+            {
+                return new UpdateProductResponse
+                {
+                    Success = false,
+                    Message = $"Couldn't update product #\"{request.Id}\": product not found!",
+                };
+            }
+
+            var hasPriceChanged = existing.Price != request.Price;
+
+            existing.CategoryId = request.CategoryId;
+            existing.Description = request.Description;
+            existing.MSRP = request.MSRP;
+            existing.Name = request.Name;
+            existing.Price = request.Price;
+            existing.SKU = request.SKU;
+            existing.Summary = request.Summary;
+            existing.LastUpdated = DateTime.UtcNow;
+            existing.LastUpdatedUserId = request.LastUpdatedUserId;
+
+            _context.SaveChanges();
+
+            if (hasPriceChanged)
+            {
+                var cartsToUpdate =
+                  _context.ShoppingCarts
+                    .Include("Items")
+                    .Where(cart => cart.Items.Any(x => x.SKU == request.SKU));
+
+                foreach (var cart in cartsToUpdate)
+                {
+                    foreach (var cartItem in cart.Items.Where(x => x.SKU == request.SKU))
+                    {
+                        cartItem.Price = request.Price;
+                    }
+
+                    cart.Recalculate();
+                }
+            }
+
+            _context.SaveChanges();
+
+            return new UpdateProductResponse
+            {
+                Success = true,
+                Message = $"Successfully updated \"{request.Name}\"",
+            };
+        }
+    }
+}

Ch06/06_04_Begin/Common/packages.config

@@ -0,0 +1,5 @@
+<?xml version="1.0" encoding="utf-8"?>
+<packages>
+  <package id="EntityFramework" version="6.2.0" targetFramework="net461" />
+  <package id="MediatR" version="4.1.0" targetFramework="net461" />
+</packages>