static void Main(string[] args)
{
var harry = new Person {
Name = "Harry"
};
var mary = new Person {
Name = "Mary"
};
var jill = new Person {
Name = "Jill"
};
var baby1 = mary.ProcreateWith(harry);
var baby2 = Person.Procreate(harry, jill);
// call operator
var baby3 = harry * mary;
WriteLine($"{mary.Name} has {mary.Children.Count} children.");
WriteLine($"{harry.Name} has {harry.Children.Count} children.");
WriteLine($"{jill.Name} has {jill.Children.Count} children.");
WriteLine($"{mary.Name}'s first child is named \"{mary.Children[0].Name}\"");
WriteLine(new string('-', 50));
WriteLine($"5! is {Person.Factorial(5)}");
// delegates
WriteLine(new string('-', 50));
var p1 = new Person();
int answer = p1.MethodIWantToCall("Frog");
WriteLine(answer);
var d = new DelegateWithMatchingSignature(p1.MethodIWantToCall);
int answer2 = d("Frog");
WriteLine(answer2);
WriteLine(new string('-', 50));
harry.Shout += Harry_Shout;
harry.Poke();
harry.Poke();
harry.Poke();
harry.Poke();
WriteLine(new string('-', 50));
Person[] people =
{
new Person {
Name = "Simon"
},
new Person {
Name = "Jenny"
},
new Person {
Name = "Adam"
},
new Person {
Name = "Richard"
}
};
WriteLine("Initial list for people");
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
WriteLine("Use Person's IComparable implementation to sort:");
Array.Sort(people);
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
WriteLine("Use PersonComparer's IComparer implementation to sort");
Array.Sort(people, new PersonComparer());
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
WriteLine(new string('-', 50));
var t = new Thing();
t.Data = 42;
WriteLine($"Thing : {t.Process("42")}");
// generic
var gt = new GenericThing <int>();
gt.Data = 42;
WriteLine($"Generic thing: {gt.Process("42")}");
WriteLine(new string('-', 50));
Employee e1 = new Employee
{
Name = "John Jones",
HireDate = new DateTime(1990, 7, 28)
};
e1.WriteToConsole();
WriteLine(new string('-', 50));
WriteLine(e1.ToString());
WriteLine(new string('-', 50));
Employee aliceInEmployee = new Employee
{
Name = "Alice",
EmployeeCode = "AA123"
};
Person aliceInPerson = aliceInEmployee;
aliceInEmployee.WriteToConsole();
aliceInPerson.WriteToConsole();
WriteLine(aliceInEmployee.ToString());
WriteLine(aliceInPerson.ToString());
if (aliceInPerson is Employee)
{
WriteLine($"{nameof(aliceInPerson)} IS an Employee");
Employee e2 = (Employee)aliceInPerson;
}
Employee e3 = aliceInPerson as Employee;
if (e3 != null)
{
WriteLine($"{nameof(aliceInPerson)} IS an Employee");
}
WriteLine(new string('-', 50));
try
{
e1.TimeTravel(new DateTime(1999, 12, 31));
e1.TimeTravel(new DateTime(1950, 12, 25));
}
catch (PersonException ex)
{
WriteLine(ex.Message);
}
WriteLine(new string('-', 50));
string email1 = "*****@*****.**";
string email2 = "ian&test.com";
WriteLine($"{email1} is a valid e-mail address: " +
$"{email1.IsValidEmail()}");
WriteLine($"{email2} is a valid e-mail address: " +
$"{email2.IsValidEmail()}");
}
static void Chapter06()
{
var harry = new Person {
Name = "Harry"
};
var mary = new Person {
Name = "Mary"
};
var jill = new Person {
Name = "Jill"
};
// call instance method
var baby1 = mary.ProcreateWith(harry);
// call static method
var baby2 = Person.Procreate(harry, jill);
var baby3 = harry * mary;
WriteLine($"{mary.Name} has {mary.Children.Count} children");
WriteLine($"{harry.Name} has {harry.Children.Count} children");
WriteLine($"{jill.Name} has {jill.Children.Count} children");
WriteLine($"{mary.Name}'s first child is named \"{mary.Children[0].Name}\".");
// factorial with local function
WriteLine($"5! is {Person.Factorial(5)}");
// Delegate example code
var p1 = new Person("Delegate");
// normal way
int answer = p1.MethodIWantToCall(p1.Name);
// assign defined delegate function to variable
var d = new DelegateWithMatchingSignature(p1.MethodIWantToCall);
int delegatedAnswer = d("Frog");
WriteLine($"Delegated Answer: {delegatedAnswer}");
// delegate example
harry.Shout += Harry_Shout;
harry.Poke();
harry.Poke();
harry.Poke();
harry.Poke();
// Demonstrating Interfaces
Person[] people =
{
new Person {
Name = "Simon"
},
new Person {
Name = "Jenny"
},
new Person {
Name = "Adam"
},
new Person {
Name = "Richard"
}
};
WriteLine("Initial List of people:");
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
WriteLine("Use Person's IComparable implementation to sort:");
Array.Sort(people);
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
// Using Custom IComparer implementation
WriteLine("Use PersonComparers IComparer implementation to sort:");
Array.Sort(people, new PersonComparer());
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
// not using generics - generates warning - comparison not valid
var t = new Thing();
t.Data = 42;
WriteLine($"Thing: {t.Process("42")}");
// using generics - define type in <brackets>
var gt = new GenericThing <int>();
gt.Data = 42;
WriteLine($"GenericThing: {gt.Process("42")}");
// using generic methods in non-generic class
string number1 = "4";
WriteLine($"{number1} squared is {Squarer.Square<string>(number1)}");
byte number2 = 3;
WriteLine($"{number2} squared is {Squarer.Square<byte>(number2)}");
// Using Structs
var dv1 = new DisplacementVector(3, 5);
var dv2 = new DisplacementVector(-2, 7);
var dv3 = dv1 + dv2;
WriteLine($"({dv1.X}, {dv1.Y}) + ({dv2.X}, {dv2.Y}) = ({dv3.X}, {dv3.Y})");
// Using Employee (inheriting from Person)
Employee e1 = new Employee
{
Name = "John Jones",
DateOfBirth = new DateTime(1990, 7, 28)
};
e1.WriteToConsole();
e1.EmployeeCode = "JJ001";
e1.HireDate = new DateTime(2014, 11, 23);
WriteLine($"{e1.Name} was hired on {e1.HireDate:dd/MM/yy}");
// uses System.Object.ToString() until overriden.
WriteLine(e1.ToString());
// demonstrate difference between polymorphism and non-polymorphism
// "<blank> new" = non-polymorhpic
// "virtual override" = polymorphic
Employee aliceInEmployee = new Employee {
Name = "Alice", EmployeeCode = "AA123"
};
Person aliceInPerson = aliceInEmployee;
aliceInEmployee.WriteToConsole();
// doesn't use the WriteToConsole override
aliceInPerson.WriteToConsole();
WriteLine(aliceInEmployee.ToString());
// still uses overriden method in Employee Class
WriteLine(aliceInPerson.ToString());
// checking class is type we expect it to be.
if (aliceInPerson is Employee)
{
WriteLine($"{nameof(aliceInPerson)} IS an employee");
Employee e2 = (Employee)aliceInPerson;
// do something with e2
}
// or, convert is possible, if unavailable as returns null
Employee e3 = aliceInPerson as Employee;
if (e3 != null)
{
WriteLine($"{nameof(aliceInPerson)} AS an Employee");
}
// use custom exception
try
{
e1.TimeTravel(new DateTime(1999, 12, 31));
e1.TimeTravel(new DateTime(1950, 12, 25));
}
catch (PersonException ex)
{
WriteLine(ex.Message);
}
// adding methods to string
string email1 = "*****@*****.**";
string email2 = "pamela&test.com";
WriteLine($"{email1} is a valid e-mail address: {email2.IsValidEmail()}");
WriteLine($"{email2} is a valid e-mail address: {email1.IsValidEmail()}");
}
static void Main(string[] args)
{
var harry = new Person {
Name = "Harry"
};
var mary = new Person {
Name = "Mary"
};
var jill = new Person {
Name = "Jill"
};
//call instance method
var baby1 = mary.ProcreateWith(harry);
//call static method
var baby2 = Person.Procreate(harry, jill);
//call an operator
var baby3 = harry * mary;
WriteLine($"{harry.Name} has {harry.Children.Count} children.");
WriteLine($"{mary.Name} has {mary.Children.Count} children.");
WriteLine($"{jill.Name} has {jill.Children.Count} children.");
WriteLine(
format: "{0}'s first child is named \"{1}\".",
arg0: harry.Name,
arg1: harry.Children[0].Name);
WriteLine($"5! is {Person.Factorial(5)}");
var p1 = new Person {
Name = "Joe"
};
int answer = p1.MethodIWantToCall("Frog");
WriteLine($"instance->{answer}");
var d = new DelegateWithMatchingSignature(p1.MethodIWantToCall);
int answer2 = d("Frog");
WriteLine($"delegate->{answer2}");
harry.Shout += Harry_Shout;
harry.Poked();
harry.Poked();
harry.Poked();
harry.Poked();
Person[] people =
{
new Person {
Name = "Simon"
},
new Person {
Name = "Cathy"
},
new Person {
Name = "Judy"
},
new Person {
Name = "Adam"
}
};
WriteLine("initial list of people:");
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
WriteLine("Use Person's IComparable to implementation to sort:");
Array.Sort(people);
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
WriteLine("Use PersonComparer's IComparer to implementation to sort:");
Array.Sort(people, new PersonComparer());
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
var t1 = new Thing();
t1.Data = 42;
WriteLine($"Thing with an integer: {t1.Process(42)}");
var t2 = new Thing();
t2.Data = "apple";
WriteLine($"Thing with a string: {t2.Process("apple")}");
var gt1 = new GenericThing <int>();
WriteLine($"{gt1.ToString()}");
gt1.Data = 42;
WriteLine($"GenericThing with an integer: {gt1.Process(42)}");
var gt2 = new GenericThing <string>();
gt2.Data = "apple";
WriteLine($"GenericThing with a string: {gt2.Process("apple")}");
string number1 = "4";
WriteLine("{0} squuared is {1}", arg0: number1, arg1: Squarer.Square <string>(number1));
byte number2 = 3;
WriteLine("{0} squared is {1}", arg0: number2, arg1: Squarer.Square(number2));
var dv1 = new DisplacementVector(2, 5);
var dv2 = new DisplacementVector(-1, 7);
var dv3 = dv1 + dv2;
WriteLine($"({dv1.X},{dv1.Y}) + ({dv2.X},{dv2.Y}) = ({dv3.X},{dv3.Y})");
Employee john = new Employee {
Name = "John Jones",
DateOfBirth = new DateTime(1990, 7, 28)
};
john.WriteToConsole();
john.EmployeeCode = "JJ001";
john.HireDate = new DateTime(2014, 11, 23);
WriteLine($"{john.Name} was hired on {john.HireDate:yyyy/MMM/dd}");
john.WriteToConsole();
WriteLine(john.ToString());
Employee aliceInEmployee = new Employee {
Name = "Alice", EmployeeCode = "AA123"
};
Person aliceInPerson = aliceInEmployee;
aliceInEmployee.WriteToConsole();
aliceInPerson.WriteToConsole();
WriteLine(aliceInEmployee.ToString());
WriteLine(aliceInPerson.ToString());
if (aliceInPerson is Employee)
{
WriteLine($"{nameof(aliceInPerson)} is an Employee");
Employee explicitAlice = (Employee)aliceInPerson;
}
Employee aliceAsEmployee = aliceInPerson as Employee;
if (aliceAsEmployee != null)
{
WriteLine($"{nameof(aliceAsEmployee)} as an Employee");
}
try{
john.TimeTravel(new DateTime(1999, 12, 31));
john.TimeTravel(new DateTime(1950, 12, 20));
}catch (PersonException ex) {
WriteLine(ex.Message);
}
string email1 = "*****@*****.**";
string email2 = "inst&test.com";
WriteLine("{0} is a valid e-mail address: {1}",
arg0: email1, arg1: StringExtension.IsValidEmail(email1));
WriteLine("{0} is a valid e-mail address: {1}",
arg0: email2, arg1: StringExtension.IsValidEmail(email2));
WriteLine("{0} is a valid e-mail address: {1}",
arg0: email1, arg1: email1.IsValidEmail());
WriteLine("{0} is a valid e-mail address: {1}",
arg0: email2, arg1: email2.IsValidEmail());
}
static void Main(string[] args)
{
var harry = new Person {
Name = "Harry"
};
var mary = new Person {
Name = "Mary"
};
var jill = new Person {
Name = "Jill"
};
// call instance method
var baby1 = mary.ProcreateWith(harry);
// call static method
var baby2 = Person.Procreate(harry, jill);
WriteLine($"{harry.Name} has {harry.Children.Count} children.");
WriteLine($"{mary.Name} has {mary.Children.Count} children.");
WriteLine($"{jill.Name} has {jill.Children.Count} children.");
WriteLine(
format: "{0}'s first child is named \"{1}\".",
arg0: harry.Name,
arg1: harry.Children[0].Name);
string s1 = "Hello ";
string s2 = "World!";
// string s3 = string.Concat(s1, s2);
string s3 = s1 + s2;
WriteLine(s3);
WriteLine($"5! is {Person.Factorial(5)}");
var p1 = new Person();
var answer1 = p1.MethodIWantToCall("Frog");
var d = new DelegateWithMatchingSignature(new Person().MethodIWantToCall);
var answer2 = d("Frog");
harry.Shout += Harry_Shout;
harry.Poke();
harry.Poke();
harry.Poke();
harry.Poke();
Person[] people =
{
new Person {
Name = "Simon"
},
new Person {
Name = "Jenny"
},
new Person {
Name = "Adam"
},
new Person {
Name = "Richard"
}
};
WriteLine("Initial list of people:");
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
WriteLine("Use Person's IComparable implementation to sort:");
Array.Sort(people);
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
WriteLine("Use PersonComparer's IComparer implementation to sort: ");
Array.Sort(people, new PersonComparer());
foreach (var person in people)
{
WriteLine($"{person.Name}");
}
var gt1 = new GenericThing <int>();
gt1.Data = 42;
WriteLine($"GenericThing with an integer: {gt1.Process(42)}");
var gt2 = new GenericThing <string>();
gt2.Data = "apple";
WriteLine($"GenericThing with a string: {gt2.Process("apple")}");
string number1 = "4";
WriteLine("{0} squared is {1}",
arg0: number1,
arg1: Squarer.Square <string>(number1));
byte number2 = 3;
WriteLine("{0} squared is {1}",
arg0: number2,
arg1: Squarer.Square(number2));
var dv1 = new DisplacementVector(3, 5);
var dv2 = new DisplacementVector(-2, 7);
var dv3 = dv1 + dv2;
WriteLine($"({dv1.X}, {dv1.Y}) + ({dv2.X}, {dv2.Y}) = ({ dv3.X}, { dv3.Y})");
Employee john = new Employee
{
Name = "John Jones",
DateOfBirth = new DateTime(1990, 7, 28)
};
john.WriteToConsole();
john.EmployeeCode = "JJ001";
john.HireDate = new DateTime(2014, 11, 23);
WriteLine($"{john.Name} was hired on {john.HireDate:dd / MM / yy}");
string email1 = "*****@*****.**";
string email2 = "ian&test.com";
WriteLine(
"{0} is a valid e-mail address: {1}",
arg0: email1,
arg1: email1.IsValidEmail());
WriteLine(
"{0} is a valid e-mail address: {1}",
arg0: email2,
arg1: email2.IsValidEmail());
}