Initial commit

vscode/Chapter09/WorkingWithJson/Program.cs

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+using System.Text.Json; // JsonSerializer
+
+using static System.Environment;
+using static System.IO.Path;
+
+Book mybook = new(title:
+  "C# 11 and .NET 7 - Modern Cross-platform Development")
+{
+  Author = "Mark J Price",
+  PublishDate = new(year: 2022, month: 11, day: 8),
+  Pages = 823,
+  Created = DateTimeOffset.UtcNow,
+};
+
+JsonSerializerOptions options = new()
+{
+  /*
+  IncludeFields = true, // includes all fields
+  PropertyNameCaseInsensitive = true,
+  WriteIndented = true,
+  PropertyNamingPolicy = JsonNamingPolicy.CamelCase,
+  */
+};
+
+string filePath = Combine(CurrentDirectory, "mybook.json");
+
+using (Stream fileStream = File.Create(filePath))
+{
+  JsonSerializer.Serialize<Book>(
+    utf8Json: fileStream, value: mybook, options);
+}
+
+WriteLine("Written {0:N0} bytes of JSON to {1}",
+  arg0: new FileInfo(filePath).Length,
+  arg1: filePath);
+WriteLine();
+
+// Display the serialized object graph 
+WriteLine(File.ReadAllText(filePath));