C# Inheritance: Uses and Advantages

In C#, inheritance is a concept of object-oriented programming that allows a class (referred to as a subclass or derived class) to inherit properties and methods from another class (referred to as a superclass or base class). The subclass can inherit fields, methods, and properties from the superclass, and can also add its own fields, methods, and properties.

The main uses of inheritance include the following aspects:

1. Code reusability: By using inheritance, subclasses can directly access the properties and methods of the parent class without needing to re-implement the same code, reducing code redundancy.
2. Extend functionality: Subclasses have the ability to add new methods and properties on top of inheriting from the parent class, thus enhancing functionality and making the code more flexible.
3. Polymorphism: By inheritance, a parent class reference can point to a child class object, utilizing polymorphism to achieve runtime dynamic binding and enhance the code’s extensibility and maintainability.

The syntax format for inheritance is as follows:

class 父类
{
    // 父类的字段、属性和方法
}

class 子类 : 父类
{
    // 子类的字段、属性和方法
}

Subclasses specify inheritance from a parent class using a colon (:), and can inherit the public and protected members of the parent class, but not the private members. Subclasses can override the virtual and abstract methods of the parent class, and can also call the parent class’s constructor and methods using the keyword “base.”

It is important to note that in C#, only single inheritance is supported, meaning a subclass can only inherit from one parent class, but multiple inheritance effects can be achieved through interfaces.