抽象类和构造函数 [英] Abstract class and constructor

问题描述

由于无法实例化抽象类，为什么在抽象类中仍允许使用构造函数？

As an abstract class cannot be instantiated, why is a constructor still allowed inside the abstract class?

public abstract class SomeClass 
 {  
     private string _label;

     public SomeClass(string label)  
     {  
         _label=label;
     }  
}

推荐答案

构造函数派生类的任何一个仍必须在抽象类中调用构造函数。如果根本不指定任何构造函数，则所有派生类都将只使用编译器提供的默认无参数类。

Constructors of any derived class still have to call a constructor in the abstract class. If you don't specify any constructors at all, all derived classes will just have to use the default parameterless one supplied by the compiler.

构造函数-但在这种情况下，公共实际上等效于受保护。

It absolutely makes sense to have a constructor - but "public" is really equivalent to "protected" in this case.

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