public static void C_ObjectGotInstanceLevelMethodsFromClass()
{
var giftBox = new FilledColoredGiftBox("Novel", "White");
// This method inly use value of passed argument - name.
giftBox.PlaySong("Helen");
// This method use data of the gift itself
giftBox.PrintCongratulation();
}
public static void D_ClassHasClassLevelMethods()
{
// Assume, our gifts could be delivered by single service
Trace.TraceInformation($"Gifts delivery service: {FilledColoredGiftBox.GetDeliveryServiceName()}");
FilledColoredGiftBox.ChangeDeliveryServiceName("Amazon");
Trace.TraceInformation($"New gifts delivery service: {FilledColoredGiftBox.GetDeliveryServiceName()}");
// if you uncomment following code, you get an error: 'CS0176 Member cannot be accessed with an instance reference; qualify it with a type name instead'
// var gift = new FilledColoredGiftBox("Detective story", "Blue");
// gift.GetDeliveryServiceName();
}
public static void B_CreateObject()
{
// Class with default constructor.
var emptyGiftBox = new EmptyGiftBox();
emptyGiftBox
.Should()
.NotBeNull();
// Class with parametrized constructor
var poem = "poem";
var filledGiftBox = new FilledGiftBox(poem);
filledGiftBox
.Should()
.NotBeNull();
filledGiftBox
.Gift
.Should()
.Be(poem);
// Class with chained constructors
var tale = "Tale";
var boxColor = "Yellow";
var filledColoredGiftBox = new FilledColoredGiftBox(tale, boxColor);
filledColoredGiftBox
.Should()
.NotBeNull();
filledColoredGiftBox
.Gift
.Should()
.Be(tale);
filledColoredGiftBox
.Color
.Should()
.Be(boxColor);
}
