Inheritance of object-oriented programming mechanism in C # learning notes

Inheritance reflects the relationship between classes and classes.

Many things in the world are common, the common part of which we are abstract as a base class, used to derive other classes, so as to improve the reusability of code, so that the structure of the code is clear and easy to read, and easy code extension and maintenance.

C # inheritance can inherit from only one base class, which differs from C + + inheritance.

C # Inheritance has transitivity, that is, b inherits from A,c inherits from B, and all of the attributes of a are.

The inheritance of C # is implicitly public.

If the call to a base class constructor is not displayed in the derived class constructor, the compiler automatically inserts a call to the base class's default constructor before executing the code in the derived class constructor, which causes a compilation error if the base class does not have a default constructor.

For example: Animal commonness: Having a mouth, having eyes, having a nose, being able to move, eating something

So define the base class (contains the animal's generality)

The code is as follows:

public class Animal {

......

}

When you define specific animals, you can inherit from the base class animal, without redefining these basic features, just define your own unique features.

For example: Dog

The code is as follows:

public class Dog:animal

{

The compiler automatically inserts a call to the default constructor of the base class before executing the code in the derived class builder

public string bark;//Dog barking

}

The code is as follows:

public class Dog:animal {

Calling a base class constructor in a derived class builder

Public Dog ()

: Base () {

}

public string Bark;

}

Attention:

You can assign the value of a derived class to a base class, but you cannot assign the value of a base class to a derived class, because the base class cannot be converted to a derived class, and the base class contains only a subset of the attributes of the derived class.

Animal animal=new Dog (); The right

Dog dog=new Animal (); error

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Inheritance of object-oriented programming mechanism in C # learning notes