Initial commit

vscode/Chapter05/PacktLibrary/BankAccount.cs

@@ -0,0 +1,8 @@
+namespace Packt.Shared;
+
+public class BankAccount
+{
+  public string? AccountName; // instance member
+  public decimal Balance; // instance member
+  public static decimal InterestRate; // shared member
+}

vscode/Chapter05/PacktLibrary/Book.cs

@@ -0,0 +1,8 @@
+namespace Packt.Shared;
+
+public class Book
+{
+  // required is not working in .NET 7 Preview 1
+  public /* required */ string? Isbn { get; set; }
+  public string? Title { get; set; }
+}

vscode/Chapter05/PacktLibrary/FlightPatterns.cs

@@ -0,0 +1,29 @@
+namespace Packt.Shared;
+
+public class BusinessClassPassenger
+{
+  public override string ToString()
+  {
+    return "Business Class";
+  }
+}
+
+public class FirstClassPassenger
+{
+  public int AirMiles { get; set; }
+
+  public override string ToString()
+  {
+    return $"First Class with {AirMiles:N0} air miles";
+  }
+}
+
+public class CoachClassPassenger
+{
+  public double CarryOnKG { get; set; }
+
+  public override string ToString()
+  {
+    return $"Coach Class with {CarryOnKG:N2} KG carry on";
+  }
+}

vscode/Chapter05/PacktLibrary/PacktLibrary.csproj

@@ -0,0 +1,14 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+	<PropertyGroup>
+		<TargetFramework>netstandard2.0</TargetFramework>
+		<LangVersion>10</LangVersion>
+		<ImplicitUsings>enable</ImplicitUsings>
+		<Nullable>enable</Nullable>
+	</PropertyGroup>
+
+	<ItemGroup>
+		<Using Include="System.Console" Static="true" />
+	</ItemGroup>
+
+</Project>

vscode/Chapter05/PacktLibrary/Person.cs

@@ -0,0 +1,103 @@
+namespace Packt.Shared; // file-scoped namespace
+
+public partial class Person : object
+{
+  // fields
+  public string? Name;
+  public DateTime DateOfBirth;
+  public WondersOfTheAncientWorld FavoriteAncientWonder;
+  public WondersOfTheAncientWorld BucketList;
+  public List<Person> Children = new();
+
+  // constants
+  public const string Species = "Homo Sapiens";
+
+  // read-only fields
+  public readonly string HomePlanet = "Earth";
+  public readonly DateTime Instantiated;
+
+  // constructors
+  public Person()
+  {
+    // set default values for fields
+    // including read-only fields
+    Name = "Unknown";
+    Instantiated = DateTime.Now;
+  }
+
+  public Person(string initialName, string homePlanet)
+  {
+    Name = initialName;
+    HomePlanet = homePlanet;
+    Instantiated = DateTime.Now;
+  }
+
+  // methods
+  public void WriteToConsole()
+  {
+    WriteLine($"{Name} was born on a {DateOfBirth:dddd}.");
+  }
+
+  public string GetOrigin()
+  {
+    return $"{Name} was born on {HomePlanet}.";
+  }
+
+  public (string, int) GetFruit()
+  {
+    return ("Apples", 5);
+  }
+
+  public (string Name, int Number) GetNamedFruit()
+  {
+    return (Name: "Apples", Number: 5);
+  }
+
+  // deconstructors
+  public void Deconstruct(out string? name, out DateTime dob)
+  {
+    name = Name;
+    dob = DateOfBirth;
+  }
+
+  public void Deconstruct(out string? name,
+    out DateTime dob, out WondersOfTheAncientWorld fav)
+  {
+    name = Name;
+    dob = DateOfBirth;
+    fav = FavoriteAncientWonder;
+  }
+
+  public string SayHello()
+  {
+    return $"{Name} says 'Hello!'";
+  }
+
+  public string SayHello(string name)
+  {
+    return $"{Name} says 'Hello, {name}!'";
+  }
+
+  public string OptionalParameters(string command = "Run!",
+    double number = 0.0, bool active = true)
+  {
+    return string.Format(
+      format: "command is {0}, number is {1}, active is {2}",
+      arg0: command,
+      arg1: number,
+      arg2: active);
+  }
+
+  public void PassingParameters(int x, ref int y, out int z)
+  {
+    // out parameters cannot have a default
+    // AND must be initialized inside the method
+    z = 99;
+    // increment each parameter
+    x++;
+    y++;
+    z++;
+  }
+
+}
+

vscode/Chapter05/PacktLibrary/PersonAutoGen.cs

@@ -0,0 +1,153 @@
+namespace Packt.Shared;
+
+// this file simulates an autogenerated class
+
+public partial class Person
+{
+  // a readonly property defined using C# 1 - 5 syntax
+  public string Origin
+  {
+    get
+    {
+      return string.Format("{0} was born on {1}",
+        arg0: Name, arg1: HomePlanet);
+    }
+  }
+
+  // two readonly properties defined using C# 6+ lambda expression body syntax
+  public string Greeting => $"{Name} says 'Hello!'";
+  public int Age => DateTime.Today.Year - DateOfBirth.Year;
+
+  // a read-write property defined using C# 3.0 syntax
+  public string? FavoriteIceCream { get; set; } // auto-syntax
+
+  // a private field to store the property value
+  private string? favoritePrimaryColor;
+
+  // a public property to read and write to the field
+  public string? FavoritePrimaryColor
+  {
+    get
+    {
+      return favoritePrimaryColor;
+    }
+    set
+    {
+      switch (value?.ToLower())
+      {
+        case "red":
+        case "green":
+        case "blue":
+          favoritePrimaryColor = value;
+          break;
+        default:
+          throw new ArgumentException(
+            $"{value} is not a primary color. " +
+            "Choose from: red, green, blue.");
+      }
+    }
+  }
+
+  // indexers
+  public Person this[int index]
+  {
+    get
+    {
+      return Children[index]; // pass on to the List<T> indexer
+    }
+    set
+    {
+      Children[index] = value;
+    }
+  }
+
+  public Person this[string name]
+  {
+    get
+    {
+      return Children.Find(p => p.Name == name);
+    }
+    set
+    {
+      Person found = Children.Find(p => p.Name == name);
+      if (found is not null) found = value;
+    }
+  }
+
+  private bool married = false;
+  public bool Married => married;
+
+  private Person? spouse = null;
+  public Person? Spouse => spouse;
+
+  // static method to marry
+  public static void Marry(Person p1, Person p2)
+  {
+    p1.Marry(p2);
+  }
+
+  // instance method to marry
+  public void Marry(Person partner)
+  {
+    if (married) return;
+    spouse = partner;
+    married = true;
+    partner.Marry(this);
+  }
+
+  // static method to "multiply"
+  public static Person Procreate(Person p1, Person p2)
+  {
+    if (p1.Spouse != p2)
+    {
+      throw new ArgumentException("You must be married to procreate.");
+    }
+
+    Person baby = new()
+    {
+      Name = $"Baby of {p1.Name} and {p2.Name}",
+      DateOfBirth = DateTime.Now
+    };
+
+    p1.Children.Add(baby);
+    p2.Children.Add(baby);
+
+    return baby;
+  }
+
+  // instance method to "multiply"
+  public Person ProcreateWith(Person partner)
+  {
+    return Procreate(this, partner);
+  }
+
+  // operator to "marry"
+  public static bool operator +(Person p1, Person p2)
+  {
+    Marry(p1, p2);
+    return p1.Married && p2.Married; // confirm they are both now married
+  }
+
+  // operator to "multiply"
+  public static Person operator *(Person p1, Person p2)
+  {
+    return Procreate(p1, p2);
+  }
+
+  // method with a local function
+  public static int Factorial(int number)
+  {
+    if (number < 0)
+    {
+      throw new ArgumentException(
+        $"{nameof(number)} cannot be less than zero.");
+    }
+    return localFactorial(number);
+
+    int localFactorial(int localNumber) // local function
+    {
+      if (localNumber == 0) return 1;
+      return localNumber * localFactorial(localNumber - 1);
+    }
+  }
+}

vscode/Chapter05/PacktLibrary/Records.cs

@@ -0,0 +1,7 @@
+namespace Packt.Shared;
+
+public class ImmutablePerson
+{
+  //public string? FirstName { get; init; }
+  //public string? LastName { get; init; }
+}

vscode/Chapter05/PacktLibrary/WondersOfTheAncientWorld.cs

@@ -0,0 +1,14 @@
+namespace Packt.Shared;
+
+[Flags]
+public enum WondersOfTheAncientWorld : byte
+{
+  None = 0b_0000_0000, // i.e. 0
+  GreatPyramidOfGiza = 0b_0000_0001, // i.e. 1
+  HangingGardensOfBabylon = 0b_0000_0010, // i.e. 2
+  StatueOfZeusAtOlympia = 0b_0000_0100, // i.e. 4
+  TempleOfArtemisAtEphesus = 0b_0000_1000, // i.e. 8
+  MausoleumAtHalicarnassus = 0b_0001_0000, // i.e. 16
+  ColossusOfRhodes = 0b_0010_0000, // i.e. 32
+  LighthouseOfAlexandria = 0b_0100_0000  // i.e. 64
+}