接口 interface

接口

 1public interface IPict  //隐式声明为public
 2    {
 3        int DelectImage();
 4        void DisplayImage();
 5    }
 6    public class MyImage:IPict  //不是继承，是实现于IPict
 7    {
 8        public int DelectImage()
 9        {
10            Console.WriteLine("DelectImage实现！");
11            return (5);
12        }
13
14        public void DisplayImage()
15        {
16            Console.WriteLine("DisplayImage实现！");
17        }
18        static void Main(string[] args)
19        {
20            MyImage objM = new MyImage();
21            objM.DisplayImage();
22            int t = objM.DelectImage();
23            Console.WriteLine(t);
24        }
25    }

多重接口
在C#中，只要不发生命名冲突，就完全可以允许多重接口实现。

 1 public interface IPictManip
 2    {
 3        void ApplyAlpha();
 4    }
 5    public interface IPict
 6    {
 7        int DelectImage();
 8        void DisplayImage();
 9    }
10    public class BaselO
11    {
12        public void Open()
13        {
14            Console.WriteLine("BaselO的Open方法");
15        }
16    }
17    public class MyImage : BaselO, IPict, IPictManip
18    {
19        public int DelectImage()
20        {
21            Console.WriteLine("DelectImage实现！");
22            return (5);
23        }
24
25        public void DisplayImage()
26        {
27            Console.WriteLine("DisplayImage实现！");
28        }
29
30        public void ApplyAlpha()
31        {
32            Console.WriteLine("ApplyAlpha实现！");
33        }
34        static void Main(string[] args)
35        {
36            MyImage objm = new MyImage();
37            objm.Open();
38            objm.ApplyAlpha();
39            objm.DelectImage();
40            objm.DisplayImage();
41          
42        }
43    }

显示接口

 1public interface IPictManip
 2    {
 3        void ApplyAlpha();
 4    }
 5    public interface IPict
 6    {
 7        void ApplyAlpha();
 8    }
 9    public class BaselO
10    {
11        public void Open()
12        {
13            Console.WriteLine("BaselO的Open方法");
14        }
15    }
16    public class MyImage : BaselO, IPict, IPictManip
17    {
18        void IPict.ApplyAlpha()
19        {
20            Console.WriteLine("实现了IPict的ApplyAlpha方法");
21        }
22        void IPictManip.ApplyAlpha()
23        {
24            Console.WriteLine("实现了IPictManip的ApplyAlpha方法");
25        }
26        static void Main(string[] args)
27        {
28            MyImage objm = new MyImage();
29            objm.Open();
30            IPict Pict = objm;  //IPict引用
31            Pict.ApplyAlpha();
32            IPictManip PcitManip = objm;
33            PcitManip.ApplyAlpha();
34        }
35    }