定义一个借口，接口封装了矩形的长和宽，而且还包含一个自定义的方法以计算矩形的面积。然后定义一个类，继承自该接口，在该类中实现接口中自定义方法。
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 6 namespace Test06 7 { 8 interface ImyInterface 9 {10 /// <summary>11 /// 长12 /// </summary>13 int Width14 {15 get;16 set;17 }18 /// <summary>19 /// 宽20 /// </summary>21 int Height22 {23 get;24 set;25 }26 /// <summary>27 /// 计算矩形面积28 /// </summary>29 int Area();30 }31 class Program : ImyInterface//继承自接口32 {33 private int width = 0;34 private int height = 0;35 /// <summary>36 /// 长37 /// </summary>38 public int Width39 {40 get41 {42 return width;43 }44 set45 {46 width = value;47 }48 }49 /// <summary>50 /// 宽51 /// </summary>52 public int Height53 {54 get55 {56 return height;57 }58 set59 {60 height = value;61 }62 }63 /// <summary>64 /// 计算矩形面积65 /// </summary>66 public int Area(int Width,int Height)67 {68 return Width * Height;69 }70 static void Main(string[] args)71 {72 Program program = new Program();//实例化Program类对象73 ImyInterface imyinterface = program;//使用派生类对象实例化接口ImyInterface74 imyinterface.Width = 5;//为派生类中的Width属性赋值75 imyinterface.Height = 3;//为派生类中的Height属性赋值76 Console.WriteLine("矩形的面积为：" + imyinterface.Area(3,5));77 }78 }79 }
下面是正确的：
1 using System; 2 using System.Collections.Generic; 3 using System.Linq; 4 using System.Text; 5 6 namespace Test06 7 { 8 interface ImyInterface 9 {10 /// <summary>11 /// 长12 /// </summary>13 int Width14 {15 get;16 set;17 }18 /// <summary>19 /// 宽20 /// </summary>21 int Height22 {23 get;24 set;25 }26 /// <summary>27 /// 计算矩形面积28 /// </summary>29 int Area();30 }31 class Program : ImyInterface//继承自接口32 {33 int width = 0;34 int height = 0;35 /// <summary>36 /// 长37 /// </summary>38 public int Width39 {40 get41 {42 return width;43 }44 set45 {46 width = value;47 }48 }49 /// <summary>50 /// 宽51 /// </summary>52 public int Height53 {54 get55 {56 return height;57 }58 set59 {60 height = value;61 }62 }63 /// <summary>64 /// 计算矩形面积65 /// </summary>66 public int Area()67 {68 return Width * Height;69 }70 static void Main(string[] args)71 {72 Program program = new Program();//实例化Program类对象73 ImyInterface imyinterface = program;//使用派生类对象实例化接口ImyInterface74 imyinterface.Width = 5;//为派生类中的Width属性赋值75 imyinterface.Height = 3;//为派生类中的Height属性赋值76 Console.WriteLine("矩形的面积为：" + imyinterface.Area());77 }78 }79 }
原标题：接口里不能包括字段，构造函数，析构函数，静态成员或常量等，否则会导致错误
关键词：接口
我知道了 