Virtual methods are methods that can be overridden in inheriting (derived) classes. By default, in .NET, methods are not virtual. In order to declare a method as virtual, we need to declare it using the keyword virtual, like so:
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public virtual void MyMethod() { Console. |
In the first lesson of the Objects chapter, I was discussing in a broad way about Object Oriented Programming, acronymed OOP, and I was enumerating it’s fundamental principles: encapsulation, inheritance, abstraction and polymorphism. In this lesson, I will explain inheritance at large, and how class hierarchies improve code readability and reusability.… Read more
In OOP, namespaces are containers for a group of classes which have a common context or are categorized by common functionality. Namespaces do not have any kind of functionality, and it is not mandatory to use them. However, they offer a few advantages, most notably being the ability of sorting and grouping your code into logical units.… Read more
In C# and .NET framework, there are two implementations of the concept of “class”, from the OOP point of view: classes and structures.
While we already know that classes are defined using the class keyword, structures are defined using the keyword struct.… Read more
Generic classes, also known as generic data types or simply generics, are classes of unknown type until they are instantiated to some specific type.
Because this concept is a bit harder to explain, I will first exemplify a specific case that will help you better understand it.… Read more
C# offers nested classes, which just like all the other nested programming concepts, implies a construct (class) defined inside the body of another construct (class). The class defined this way is called “inner class”, while the one which contains it, is called “outer class”.… Read more
As we saw in the previous recent lessons, the usual way of communicating with a class is to create instances (copies) of it, and then use the resulting objects. In fact, that is the strong advantage of the classes – the ability to create copies that can be used and can be modified individually.… Read more
As their name suggests, access modifiers are some programming concepts that can alter the access level of something. In more complex words, access modifiers are reserved keywords which add information for the compiler, and the piece of code related to those modifiers.… Read more
I have explained a few times already that when we are dealing with objects, most of the times we are not working with the original class itself – the blueprint, but we are actually create copies of it called instances.… Read more
