Initial commit

vscode/Chapter09/Ch09Ex02SerializingShapes/Ch09Ex02SerializingShapes.csproj

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+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>net7.0</TargetFramework>
+    <ImplicitUsings>enable</ImplicitUsings>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+
+	<ItemGroup>
+		<Using Include="System.Console" Static="true" />
+	</ItemGroup>
+
+</Project>

vscode/Chapter09/Ch09Ex02SerializingShapes/Circle.cs

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+namespace Packt.Shared;
+
+public class Circle : Shape
+{
+  public override double Area
+  {
+    get
+    {
+      return Math.PI * Radius * Radius;
+    }
+  }
+
+  public double Radius { get; set; }
+}

vscode/Chapter09/Ch09Ex02SerializingShapes/Program.cs

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+using Packt.Shared; // Circle, Rectangle, Shape
+using System.Xml.Serialization; // XmlSerializer
+
+using static System.Environment;
+using static System.IO.Path;
+
+// create a file path to write to
+string path = Combine(CurrentDirectory, "shapes.xml");
+
+// create a list of Shape objects to serialize
+List<Shape> listOfShapes = new()
+{
+  new Circle { Colour = "Red", Radius = 2.5 },
+  new Rectangle { Colour = "Blue", Height = 20.0, Width = 10.0 },
+  new Circle { Colour = "Green", Radius = 8 },
+  new Circle { Colour = "Purple", Radius = 12.3 },
+  new Rectangle { Colour = "Blue", Height = 45.0, Width = 18.0 }
+};
+
+// create an object that knows how to serialize and deserialize 
+// a list of Shape objects
+XmlSerializer serializerXml = new(listOfShapes.GetType());
+
+WriteLine("Saving shapes to XML file:");
+
+using (FileStream fileXml = File.Create(path))
+{
+  serializerXml.Serialize(fileXml, listOfShapes);
+}
+
+WriteLine("Loading shapes from XML file:");
+List<Shape>? loadedShapesXml = null;
+
+using (FileStream fileXml = File.Open(path, FileMode.Open))
+{
+  loadedShapesXml =
+    serializerXml.Deserialize(fileXml) as List<Shape>;
+}
+
+if (loadedShapesXml == null)
+{
+  WriteLine($"{nameof(loadedShapesXml)} is empty.");
+}
+else
+{
+  foreach (Shape item in loadedShapesXml)
+  {
+    WriteLine($"{item.GetType().Name} is {item.Colour} and has an area of {item.Area:N2}");
+  }
+}

vscode/Chapter09/Ch09Ex02SerializingShapes/Rectangle.cs

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+namespace Packt.Shared;
+
+public class Rectangle : Shape
+{
+  public override double Area
+  {
+    get
+    {
+      return Height * Width;
+    }
+  }
+
+  public double Height { get; set; }
+  public double Width { get; set; }
+}

vscode/Chapter09/Ch09Ex02SerializingShapes/Shape.cs

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+using System.Xml.Serialization;
+
+namespace Packt.Shared;
+
+[XmlInclude(typeof(Circle))]
+[XmlInclude(typeof(Rectangle))]
+public abstract class Shape
+{
+  public string? Colour { get; set; }
+  public abstract double Area { get; }
+}