C#中，子类怎么初始化父类的readonly属性？

Question

class A
{
public readonly int _X;

public A()
{
     _X=3;
}

}

class B:A
{
public B()
{
//Init _X?
}

}

Answer 1

A多一个重载版本，可以传参的

class A
{
public readonly int _X;

public A(int x)
{
    _X = x;
}
public A() { }

}

class B : A
{
public B(int x):base(x) { }

}

B b = new B(12);