Initial commit

vscode/Chapter09/WorkingWithEncodings/Program.cs

@@ -0,0 +1,51 @@
+using Packt.Shared;
+using System.Text;
+
+WriteLine("Encodings");
+WriteLine("[1] ASCII");
+WriteLine("[2] UTF-7");
+WriteLine("[3] UTF-8");
+WriteLine("[4] UTF-16 (Unicode)");
+WriteLine("[5] UTF-32");
+WriteLine("[6] Latin1");
+WriteLine("[any other key] Default encoding");
+WriteLine();
+
+// choose an encoding
+Write("Press a number to choose an encoding.");
+ConsoleKey number = ReadKey(intercept: true).Key;
+WriteLine(); WriteLine();
+
+Encoding encoder = number switch
+{
+  ConsoleKey.D1 or ConsoleKey.NumPad1 => Encoding.ASCII,
+  ConsoleKey.D2 or ConsoleKey.NumPad2 => Encoding.UTF7,
+  ConsoleKey.D3 or ConsoleKey.NumPad3 => Encoding.UTF8,
+  ConsoleKey.D4 or ConsoleKey.NumPad4 => Encoding.Unicode,
+  ConsoleKey.D5 or ConsoleKey.NumPad5 => Encoding.UTF32,
+  ConsoleKey.D6 or ConsoleKey.NumPad6 => Encoding.Latin1,
+  _                                   => Encoding.Default
+};
+
+// define a string to encode
+string message = "Café £4.39";
+WriteLine($"Text to encode: {message}  Characters: {message.Length}");
+
+// encode the string into a byte array
+byte[] encoded = encoder.GetBytes(message);
+
+// check how many bytes the encoding needed
+WriteLine("{0} used {1:N0} bytes.",
+  encoder.GetType().Name, encoded.Length);
+WriteLine();
+
+// enumerate each byte 
+WriteLine($"BYTE | HEX | CHAR");
+foreach (byte b in encoded)
+{
+  WriteLine($"{b,4} | {b.ToString("X"),3} | {(char)b,4}");
+}
+
+// decode the byte array back into a string and display it
+string decoded = encoder.GetString(encoded);
+WriteLine(decoded);

vscode/Chapter09/WorkingWithEncodings/WorkingWithEncodings.csproj

@@ -0,0 +1,14 @@
+<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>