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This article mainly introduces "how to create abstract classes in C#". In daily operation, I believe that many people have doubts about how to create abstract classes in C#. The editor consulted all kinds of materials and sorted out simple and easy-to-use operation methods. I hope it will be helpful to answer the doubt of "how to create abstract classes in C#"! Next, please follow the editor to study!

Dynamic polymorphism

C # allows you to use the keyword abstract to create abstract classes that provide the implementation of some of the classes of the interface. When a derived class inherits from the abstract class, the implementation is complete. Abstract classes contain abstract methods, which can be implemented by derived classes. Derived classes have more professional functionality.

Note that here are some rules for abstract classes:

You cannot create an instance of an abstract class.

You cannot declare an abstract method outside an abstract class.

You can declare a class as a sealed class by placing the keyword sealed before the class definition. When a class is declared as sealed, it cannot be inherited. Abstract classes cannot be declared as sealed.

The following program demonstrates an abstract class:

Using System

Namespace PolymorphismApplication

{

Abstract class Shape

{

Abstract public int area ()

}

Class Rectangle: Shape

{

Private int length

Private int width

Public Rectangle (int aversion 0, int bread0)

{

Length = a

Width = b

}

Public override int area ()

{

Console.WriteLine ("area of Rectangle class:")

Return (width * length)

}

}

Class RectangleTester

{

Static void Main (string [] args)

{

Rectangle r = new Rectangle (10,7)

Double a = r.area ()

Console.WriteLine (area: {0}, a)

Console.ReadKey ()

}

}

}

When the above code is compiled and executed, it produces the following results:

Area of Rectangle class: area: 70

You can use virtual methods when there is a function defined in a class that needs to be implemented in an inherited class.

Virtual methods are declared using the keyword virtual.

Virtual methods can have different implementations in different inherited classes.

Calls to virtual methods occur at run time.

Dynamic polymorphism is achieved through abstract classes and virtual methods.

At this point, the study on "how to create abstract classes in C#" is over. I hope to be able to solve your doubts. The collocation of theory and practice can better help you learn, go and try it! If you want to continue to learn more related knowledge, please continue to follow the website, the editor will continue to work hard to bring you more practical articles!

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