摘要：
对于VS里面提示：原来的代码如下：Shape.cs中1 abstract class Shape2 {3 protected double _area;4 abstract public double Area5 {6 get;7 }8 }Ellipse.cs中1 class Ellipse:Shape2 {3 public override double Area4 {5 get 6 {7 return Math.PI * _semiMinorAxis * _semiMinorAxis;8 ... 阅读全文
