IComparable

public class Program
    {
       static void Main(String[] args)
        {
            var myInt = new[] { 20, 4, 5, 1, 6 };
            Array.Sort(myInt);
            foreach (var i in myInt)
                Console.WriteLine("{0}", i);
            Console.ReadLine();

        }
    }
/*
Array类的sort方法其实依靠一个叫做IComparable的接口！
public interface IComparable
{
    int CompareTo(object obj);
}

sort 使用的算法依赖于元素的CompareTo方法来决定两个元素的次序。int类型实现了IComparable！*/

class Program
    {
        static void Main(string[] args)
        {int i,j,t;
         var myInt = new[] { 20, 4, 5, 1, 6};
         for (i = 0; i <myInt.Length-1; i++)
          for (j = 0; j < myInt.Length - 1-i; j++)
              if (myInt[j].CompareTo(myInt[j + 1]) > 0)//myInt[j].CompareTo(myInt[j+1])<0则为降序排序，正好相反的！
            {  t=myInt[j];
               myInt[j] = myInt[j+1];
               myInt[j + 1] = t;

            }
         for (i = 0; i <myInt.Length; i++)
             Console.WriteLine("{0}", myInt[i]);
         Console.ReadLine();

        }
    }