C#构造函数里的base和this

父类的构造函数总是在子类之前执行的。

public class BaseCircle {
        public BaseCircle()
        {
            Console.WriteLine(" no arguments base constructor!!!");
        }
        public BaseCircle(double arg)
        {
            Console.WriteLine("double arg base constructor!!!");
        }
    }

    public class SubCircle : BaseCircle {
        public SubCircle():base()
        {
            Console.WriteLine("sub class no argument constructor,actually call base constructor !!!");
        }

        public SubCircle(double a):base(a)
        {
            Console.WriteLine("sub class with argument, actually call base double constructor!!!");
        }

        public SubCircle(int k):this(1,2)
        {
            Console.WriteLine("sub class with argument int k, actually call sub class constructor int i & j !!!");
        }

        public SubCircle(int i,int j)
        {
            Console.WriteLine("sub class with int i&j argument!!!!");
        }
    }

static void Main(string[] args)
        {
            SubCircle s1 = new SubCircle();
            SubCircle s2 = new SubCircle(1.1);
            SubCircle s3 = new SubCircle(1);
}

输出结果:
 no arguments base constructor!!!
sub class no argument constructor,actually call base constructor !!!

double arg base constructor!!!
sub class with argument, actually call base double constructor!!!

 no arguments base constructor!!!
sub class with int i&j argument!!!!
sub class with argument int k, actually call sub class constructor int i & j !!!












posted @ 2013-05-23 22:07  lein.wang  Views(135)  Comments(0Edit  收藏  举报