BIG阳
通过BAse 来用,在子类中,你调用的类型要和父类的调用类型相同才行,不然会出错class A {public A(int a, int b) {}}class B : A {public B (int a, int b, int x, int y) : base(a, b) {}}
https://www.imooc.com/wenda/detail/515451