天天向上

 1   public class iArray : IComparable
 2     {
 3         private int x, y;
 4         public iArray()
 5         {
 6             x = 0; y = 0;
 7         }
 8         public iArray(int ix, int iy)
 9         {
10             x = ix;
11             y = iy;
12         }
13         public void Show()
14         {
15             Console.WriteLine("({0}.{1})", x, y);
16         }
17         int IComparable.CompareTo(object obj)
18         {
19             iArray v = (iArray)obj;
20             return (x * x + y * y) - (v.x * v.x + v.y * v.y);
21         }
22     }

 1  class Program
 2     {
 3         static void Main(string[] args)
 4         {
 5             iArray[] vec = { new iArray(20, 10), 
 6                              new iArray(50, 20), 
 7                              new iArray(90, 40), 
 8                              new iArray(10, 10), 
 9                              new iArray(40, 30)};
10             Console.WriteLine("排序前...");
11             foreach (iArray v in vec)
12             {
13                 v.Show();
14             }
15            
16             Console.WriteLine("排序後(ascending)...");
17             Array.Sort(vec);
18             foreach (iArray v in vec)
19             {
20                 v.Show();
21             }
22             Console.WriteLine("排序後(descending)...");
23             Array.Reverse(vec);
24             foreach (iArray v in vec)
25             {
26                 v.Show();
27             }
28      
29             Console.Read();
30         }
31     }

 1   public class iArray : IComparable
 2     {
 3         private int x, y;
 4         public iArray()
 5         {
 6             x = 0; y = 0;
 7         }
 8         public iArray(int ix, int iy)
 9         {
10             x = ix;
11             y = iy;
12         }
13         public void Show()
14         {
15             Console.WriteLine("({0}.{1})", x, y);
16         }
17         int IComparable.CompareTo(object obj)
18         {
19             iArray v = (iArray)obj;
20             return (x * x + y * y) - (v.x * v.x + v.y * v.y);
21         }
22     }