C#中抽象类的构造函数 [英] Constructor of an abstract class in C#

问题描述

为什么可以在 C# 中为抽象类编写构造函数?
据我所知，我们不能实例化一个抽象类..那它有什么用?
你不能实例化这个类，对吧?

Why is it possible to write constructor for an abstract class in C#?
As far as I know we can't instantiate an abstract class.. so what is it for?
You can't instantiate the class, right?

推荐答案

因为可能有一种标准的方式来实例化抽象类中的数据.这样你就可以让继承自该类的类调用基构造函数.

Because there might be a standard way you want to instantiate data in the abstract class. That way you can have classes that inherit from that class call the base constructor.

public abstract class A{

    private string data;

    protected A(string myString){
      data = myString;
    }

}

public class B : A {

     B(string myString) : base(myString){}

}

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