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vscode/Chapter09/WorkingWithSerialization/Program.cs

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+using System.Xml.Serialization; // XmlSerializer
+using Packt.Shared; // Person 
+using NewJson = System.Text.Json.JsonSerializer;
+
+using static System.Environment;
+using static System.IO.Path;
+
+// create an object graph
+List<Person> people = new()
+{
+  new(30000M)
+  {
+    FirstName = "Alice",
+    LastName = "Smith",
+    DateOfBirth = new(year: 1974, month: 3, day: 14)
+  },
+  new(40000M)
+  {
+    FirstName = "Bob",
+    LastName = "Jones",
+    DateOfBirth = new(year: 1969, month: 11, day: 23)
+  },
+  new(20000M)
+  {
+    FirstName = "Charlie",
+    LastName = "Cox",
+    DateOfBirth = new(year: 1984, month: 5, day: 4),
+    Children = new()
+    {
+      new(0M)
+      {
+        FirstName = "Sally",
+        LastName = "Cox",
+        DateOfBirth = new(year: 2012, month: 7, day: 12)
+      }
+    }
+  }
+};
+
+// create object that will format a List of Persons as XML
+XmlSerializer xs = new(type: people.GetType());
+
+// create a file to write to
+string path = Combine(CurrentDirectory, "people.xml");
+
+using (FileStream stream = File.Create(path))
+{
+  // serialize the object graph to the stream
+  xs.Serialize(stream, people);
+}
+
+WriteLine("Written {0:N0} bytes of XML to {1}",
+  arg0: new FileInfo(path).Length,
+  arg1: path);
+WriteLine();
+
+// Display the serialized object graph
+WriteLine(File.ReadAllText(path));
+
+WriteLine();
+WriteLine("* Deserializing XML files");
+
+using (FileStream xmlLoad = File.Open(path, FileMode.Open))
+{
+  // deserialize and cast the object graph into a List of Person
+  List<Person>? loadedPeople =
+    xs.Deserialize(xmlLoad) as List<Person>;
+
+  if (loadedPeople is not null)
+  {
+    foreach (Person p in loadedPeople)
+    {
+      WriteLine("{0} has {1} children.",
+        p.LastName, p.Children?.Count ?? 0);
+    }
+  }
+}
+
+// create a file to write to
+string jsonPath = Combine(CurrentDirectory, "people.json");
+
+using (StreamWriter jsonStream = File.CreateText(jsonPath))
+{
+  // create an object that will format as JSON
+  Newtonsoft.Json.JsonSerializer jss = new();
+
+  // serialize the object graph into a string
+  jss.Serialize(jsonStream, people);
+}
+
+WriteLine();
+WriteLine("Written {0:N0} bytes of JSON to: {1}",
+  arg0: new FileInfo(jsonPath).Length,
+  arg1: jsonPath);
+
+// Display the serialized object graph
+WriteLine(File.ReadAllText(jsonPath));
+
+WriteLine();
+WriteLine("* Deserializing JSON files");
+
+using (FileStream jsonLoad = File.Open(jsonPath, FileMode.Open))
+{
+  // deserialize object graph into a List of Person
+  List<Person>? loadedPeople =
+    await NewJson.DeserializeAsync(utf8Json: jsonLoad,
+      returnType: typeof(List<Person>)) as List<Person>;
+
+  if (loadedPeople is not null)
+  {
+    foreach (Person p in loadedPeople)
+    {
+      WriteLine("{0} has {1} children.",
+        p.LastName, p.Children?.Count ?? 0);
+    }
+  }
+}