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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}");
+  }
+}