Polynom-Interface通过接口实现多态
static void Main() 
...{
IGElement ge1= new CLine(); IGElement ge2= new CRectangle(); ge1.ID = 1; ge2.ID = 11; Console.WriteLine("ID:{0},{1}", ge1.ID, ge2.ID); ge1.Draw(); ge2.Draw();
}
using System;namespace Polinom...{
/**//// <summary> /// CGElement 的摘要说明。
/// </summary> public interface IGElement ...{ int ID ...{ get; set; } void Draw(); }}
using System;using System.Drawing;namespace Polinom...{ /**//// <summary> /// CLine 的摘要说明。 /// </summary> /// public class CLine:IGElement ...{ private int m_ID; private PointF m_Begin; private PointF m_End; public int ID ...{ get...{return m_ID;} set...{m_ID =value;} } public CLine() ...{ } public void Draw() ...{ Console.WriteLine("绘直线段。"); } }}
using System;using System.Drawing;namespace Polinom...{ /**//// <summary> /// CRectangle 的摘要说明。 /// </summary> /// public class CRectangle:IGElement ...{ private int m_ID; private PointF m_LT; private PointF m_RB; public int ID ...{ get...{return m_ID;} set...{m_ID = value;} } //矩形左上角、右下角属性定义 public void Draw() ...{ Console.WriteLine("绘矩形。"); } }}
这个调用例程更清楚
static void Main() ...{ IGElement ge1= new CLine(); IGElement ge2= new CRectangle(); IGElement Elem; ge1.ID = 1; ge2.ID = 11; Console.WriteLine("ID:{0},{1}", ge1.ID, ge2.ID); ge1.Draw(); ge2.Draw(); Elem = ge1; Elem.ID = 10; Console.WriteLine("ID:{0}", Elem.ID); Elem.Draw(); Elem = ge2; Elem.ID = 100; Console.WriteLine("ID:{0}", Elem.ID); Elem.Draw(); }