Sort<T>()小问题

Comparison<T> 是一个delegate
几个常用的例子：
<1>

class Program
    {
        static void Main(string[] args)
        {
            int[] ia = new int[] { 1, 5, 2, 4, 3, 7, 6 };
            Array.Sort(ia);
            foreach (int i in ia)
                Console.WriteLine(i);
        }
    }

<2>

 class Program
    {
        static void Main(string[] args)
        {
            List<int> il = new List<int>(){1,3,4,2,6,7,5};
            il.Sort();

            foreach (int i in il)
                Console.WriteLine(i);            
        }

<3>升序

 class Program
    {
        private static int Cmp(int x, int y)
        {
            if(x == y)
                return 0;
            else if(x < y) return -1;
            else return 1; 
        }

        static void Main(string[] args)
        {
            List<int> il = new List<int>(){1,3,4,2,6,7,5};
            il.Sort(Cmp);

            foreach (int i in il)
                Console.WriteLine(i);            
        }

class Program
    {
        private static int Cmp(int x, int y)
        {
            if(x == y)
                return 0;
            else if(x < y) return -1;
            else return 1; 
        }

        static void Main(string[] args)
        {
            int[] intArray = new int[]{1,3,4,2,6,7,5};
            Array.Sort(intArray, Cmp);
            foreach (int i in intArray)
                Console.WriteLine(i);            
        }
    }