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markjpricemarkjprice
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Add more solution code to Ch10
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‎code/Chapter10/Ch10Ex02DataSerialization/Category.cs

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using System.ComponentModel.DataAnnotations.Schema; // [Column]
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namespace Packt.Shared;
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public class Category
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{
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// these properties map to columns in the database
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public int CategoryId { get; set; }
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public string? CategoryName { get; set; }
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[Column(TypeName = "ntext")]
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public string? Description { get; set; }
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// defines a navigation property for related rows
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public virtual ICollection<Product> Products { get; set; }
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public Category()
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{
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// to enable developers to add products to a Category we must
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// initialize the navigation property to an empty collection
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Products = new HashSet<Product>();
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}
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}

‎code/Chapter10/Ch10Ex02DataSerialization/Ch10Ex02DataSerialization.csproj

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<Project Sdk="Microsoft.NET.Sdk">
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<PropertyGroup>
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<OutputType>Exe</OutputType>
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<TargetFramework>net8.0</TargetFramework>
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<ImplicitUsings>enable</ImplicitUsings>
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<Nullable>enable</Nullable>
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</PropertyGroup>
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<ItemGroup>
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<Using Include="System.Console" Static="true" />
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</ItemGroup>
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<ItemGroup>
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<PackageReference Include="Microsoft.EntityFrameworkCore.Sqlite" Version="8.0-*" />
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</ItemGroup>
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<ItemGroup>
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<None Update="Northwind.db">
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<CopyToOutputDirectory>Always</CopyToOutputDirectory>
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</None>
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</ItemGroup>
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</Project>

‎code/Chapter10/Ch10Ex02DataSerialization/Northwind.cs

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using Microsoft.EntityFrameworkCore; // DbContext, DbContextOptionsBuilder
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using Microsoft.EntityFrameworkCore.Diagnostics;
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namespace Packt.Shared;
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// this manages the connection to the database
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public class Northwind : DbContext
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{
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// these properties map to tables in the database
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public DbSet<Category>? Categories { get; set; }
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public DbSet<Product>? Products { get; set; }
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protected override void OnConfiguring(
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DbContextOptionsBuilder optionsBuilder)
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{
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string path = Path.Combine(
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Environment.CurrentDirectory, "Northwind.db");
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string connection = $"Filename={path}";
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ConsoleColor previousColor = ForegroundColor;
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ForegroundColor = ConsoleColor.DarkYellow;
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WriteLine($"Connection: {connection}");
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ForegroundColor = previousColor;
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optionsBuilder.UseSqlite(connection);
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}
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protected override void OnModelCreating(
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ModelBuilder modelBuilder)
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{
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// example of using Fluent API instead of attributes
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// to limit the length of a category name to 15
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modelBuilder.Entity<Category>()
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.Property(category => category.CategoryName)
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.IsRequired() // NOT NULL
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.HasMaxLength(15);
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if (Database.ProviderName?.Contains("Sqlite") ?? false)
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{
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// added to "fix" the lack of decimal support in SQLite
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modelBuilder.Entity<Product>()
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.Property(product => product.Cost)
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.HasConversion<double>();
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}
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}
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}

‎code/Chapter10/Ch10Ex02DataSerialization/Northwind.db

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‎code/Chapter10/Ch10Ex02DataSerialization/Northwind4SQLite.sql

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‎code/Chapter10/Ch10Ex02DataSerialization/Product.cs

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using System.ComponentModel.DataAnnotations; // [Required], [StringLength]
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using System.ComponentModel.DataAnnotations.Schema; // [Column]
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namespace Packt.Shared;
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public class Product
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{
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public int ProductId { get; set; } // primary key
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[Required]
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[StringLength(40)]
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public string ProductName { get; set; } = null!;
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[Column("UnitPrice", TypeName = "money")]
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public decimal? Cost { get; set; } // property name != column name
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[Column("UnitsInStock")]
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public short? Stock { get; set; }
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public bool Discontinued { get; set; }
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// these two define the foreign key relationship
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// to the Categories table
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public int CategoryId { get; set; }
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public virtual Category Category { get; set; } = null!;
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}

‎code/Chapter10/Ch10Ex02DataSerialization/Program.Functions.cs

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using System.Xml; // XmlWriter
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using System.Text.Json; // Utf8JsonWriter, JsonWriterOptions
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using Packt.Shared; // Category, Product
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using static System.IO.Path;
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using static System.Environment;
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// we want to easily show the difference between outputting
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// XML using elements or attributes so we will define a
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// delegate to reference the two different methods.
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delegate void WriteDataDelegate(string name, string? value);
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partial class Program
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{
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static void GenerateXmlFile(
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IQueryable<Category> categories, bool useAttributes = true)
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{
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string which = useAttributes ? "attibutes" : "elements";
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string xmlFile = $"categories-and-products-using-{which}.xml";
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using (FileStream xmlStream = File.Create(
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Combine(CurrentDirectory, xmlFile)))
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{
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using (XmlWriter xml = XmlWriter.Create(xmlStream,
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new XmlWriterSettings { Indent = true }))
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{
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WriteDataDelegate writeMethod;
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if (useAttributes)
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{
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writeMethod = xml.WriteAttributeString;
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}
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else // use elements
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{
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writeMethod = xml.WriteElementString;
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}
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xml.WriteStartDocument();
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xml.WriteStartElement("categories");
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foreach (Category c in categories)
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{
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xml.WriteStartElement("category");
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writeMethod("id", c.CategoryId.ToString());
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writeMethod("name", c.CategoryName);
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writeMethod("desc", c.Description);
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writeMethod("product_count", c.Products.Count.ToString());
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xml.WriteStartElement("products");
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foreach (Product p in c.Products)
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{
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xml.WriteStartElement("product");
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writeMethod("id", p.ProductId.ToString());
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writeMethod("name", p.ProductName);
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writeMethod("cost", p.Cost is null ? "0" : p.Cost.Value.ToString());
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writeMethod("stock", p.Stock.ToString());
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writeMethod("discontinued", p.Discontinued.ToString());
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xml.WriteEndElement(); // </product>
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}
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xml.WriteEndElement(); // </products>
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xml.WriteEndElement(); // </category>
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}
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xml.WriteEndElement(); // </categories>
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}
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}
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WriteLine("{0} contains {1:N0} bytes.",
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arg0: xmlFile,
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arg1: new FileInfo(xmlFile).Length);
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}
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static void GenerateCsvFile(IQueryable<Category> categories)
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{
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string csvFile = "categories-and-products.csv";
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using (FileStream csvStream = File.Create(Combine(CurrentDirectory, csvFile)))
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{
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using (StreamWriter csv = new(csvStream))
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{
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csv.WriteLine("CategoryId,CategoryName,Description,ProductId,ProductName,Cost,Stock,Discontinued");
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foreach (Category c in categories)
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{
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foreach (Product p in c.Products)
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{
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csv.Write("{0},\"{1}\",\"{2}\",",
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arg0: c.CategoryId,
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arg1: c.CategoryName,
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arg2: c.Description);
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csv.Write("{0},\"{1}\",{2},",
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arg0: p.ProductId,
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arg1: p.ProductName,
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arg2: p.Cost is null ? 0 : p.Cost.Value);
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csv.WriteLine("{0},{1}",
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arg0: p.Stock,
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arg1: p.Discontinued);
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}
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}
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}
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}
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WriteLine("{0} contains {1:N0} bytes.",
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arg0: csvFile,
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arg1: new FileInfo(csvFile).Length);
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}
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static void GenerateJsonFile(IQueryable<Category> categories)
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{
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string jsonFile = "categories-and-products.json";
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using (FileStream jsonStream = File.Create(Combine(CurrentDirectory, jsonFile)))
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{
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using (Utf8JsonWriter json = new(jsonStream,
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new JsonWriterOptions { Indented = true }))
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{
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json.WriteStartObject();
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json.WriteStartArray("categories");
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foreach (Category c in categories)
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{
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json.WriteStartObject();
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json.WriteNumber("id", c.CategoryId);
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json.WriteString("name", c.CategoryName);
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json.WriteString("desc", c.Description);
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json.WriteNumber("product_count", c.Products.Count);
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json.WriteStartArray("products");
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foreach (Product p in c.Products)
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{
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json.WriteStartObject();
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json.WriteNumber("id", p.ProductId);
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json.WriteString("name", p.ProductName);
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json.WriteNumber("cost", p.Cost is null ? 0 : p.Cost.Value);
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json.WriteNumber("stock", p.Stock is null ? 0 : p.Stock.Value);
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json.WriteBoolean("discontinued", p.Discontinued);
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json.WriteEndObject(); // product
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}
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json.WriteEndArray(); // products
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json.WriteEndObject(); // category
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}
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json.WriteEndArray(); // categories
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json.WriteEndObject();
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}
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}
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WriteLine("{0} contains {1:N0} bytes.",
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arg0: jsonFile,
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arg1: new FileInfo(jsonFile).Length);
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}
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}
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‎code/Chapter10/Ch10Ex02DataSerialization/Program.cs

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using Microsoft.EntityFrameworkCore; // Include extension method
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using Packt.Shared; // Northwind, Category, Product
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WriteLine("Creating four files containing serialized categories and products.");
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using (Northwind db = new())
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{
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// a query to get all categories and their related products
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IQueryable<Category>? categories = db.Categories?.Include(c => c.Products);
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if (categories is null)
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{
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WriteLine("No categories found.");
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return;
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}
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GenerateXmlFile(categories);
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GenerateXmlFile(categories, useAttributes: false);
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GenerateCsvFile(categories);
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GenerateJsonFile(categories);
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WriteLine($"Current directory: {Environment.CurrentDirectory}");
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}

‎code/Chapter10/Chapter10.sln

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33
# Visual Studio Version 17
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VisualStudioVersion = 17.6.33829.357
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MinimumVisualStudioVersion = 10.0.40219.1
6-
Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "WorkingWithEFCore", "WorkingWithEFCore\WorkingWithEFCore.csproj", "{F370D9A0-3198-4D1B-AD9B-7F2C379EB169}"
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "WorkingWithEFCore", "WorkingWithEFCore\WorkingWithEFCore.csproj", "{F370D9A0-3198-4D1B-AD9B-7F2C379EB169}"
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EndProject
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Northwind.EntityModels", "Northwind.EntityModels\Northwind.EntityModels.csproj", "{C82EA526-086F-4E32-96F8-72ACD61D46D3}"
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EndProject
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "Ch10Ex02DataSerialization", "Ch10Ex02DataSerialization\Ch10Ex02DataSerialization.csproj", "{F5BA4B70-5138-4592-9AE6-AE1CAF59BF85}"
11+
EndProject
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Project("{9A19103F-16F7-4668-BE54-9A1E7A4F7556}") = "CoursesAndStudents", "CoursesAndStudents\CoursesAndStudents.csproj", "{6C953C97-C11D-4C8C-9E3F-E96150AB9795}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
@@ -15,6 +21,18 @@ Global
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{F370D9A0-3198-4D1B-AD9B-7F2C379EB169}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{F370D9A0-3198-4D1B-AD9B-7F2C379EB169}.Release|Any CPU.ActiveCfg = Release|Any CPU
1723
{F370D9A0-3198-4D1B-AD9B-7F2C379EB169}.Release|Any CPU.Build.0 = Release|Any CPU
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{C82EA526-086F-4E32-96F8-72ACD61D46D3}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
25+
{C82EA526-086F-4E32-96F8-72ACD61D46D3}.Debug|Any CPU.Build.0 = Debug|Any CPU
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{C82EA526-086F-4E32-96F8-72ACD61D46D3}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{C82EA526-086F-4E32-96F8-72ACD61D46D3}.Release|Any CPU.Build.0 = Release|Any CPU
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{F5BA4B70-5138-4592-9AE6-AE1CAF59BF85}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
29+
{F5BA4B70-5138-4592-9AE6-AE1CAF59BF85}.Debug|Any CPU.Build.0 = Debug|Any CPU
30+
{F5BA4B70-5138-4592-9AE6-AE1CAF59BF85}.Release|Any CPU.ActiveCfg = Release|Any CPU
31+
{F5BA4B70-5138-4592-9AE6-AE1CAF59BF85}.Release|Any CPU.Build.0 = Release|Any CPU
32+
{6C953C97-C11D-4C8C-9E3F-E96150AB9795}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
33+
{6C953C97-C11D-4C8C-9E3F-E96150AB9795}.Debug|Any CPU.Build.0 = Debug|Any CPU
34+
{6C953C97-C11D-4C8C-9E3F-E96150AB9795}.Release|Any CPU.ActiveCfg = Release|Any CPU
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{6C953C97-C11D-4C8C-9E3F-E96150AB9795}.Release|Any CPU.Build.0 = Release|Any CPU
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE

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