static string[] m_Data = { "A", "B", "C", "D", "E" }; 

        static void Main(string[] args)
        {
            Dictionary<string, int> dic = new Dictionary<string, int>();
            for (int i = 0; i < m_Data.Length; i++)
            {
                Console.WriteLine(m_Data[i]);//如果不需要打印单元素的组合，将此句注释掉
                dic.Add(m_Data[i], i);
            }
            GetString(dic);
            Console.ReadLine();
        }

        static void GetString(Dictionary<string,int> dd)
        {
            Dictionary<string, int> dic = new Dictionary<string, int>();
            foreach (KeyValuePair<string, int> kv in dd)
            {
                for (int i = kv.Value + 1; i < m_Data.Length; i++)
                {
                    Console.WriteLine(kv.Key + m_Data[i]);
                    dic.Add(kv.Key + m_Data[i], i);
                }
            }
            if(dic.Count>0) GetString(dic);
        }

        static void Main(string[] args)
        {
            string[] arr = new[] { "A", "B", "C", "D", "E" };
            GetCombination(arr);
        }

        static void GetCombination(string[] nums)
        {
            double count = Math.Pow(2, nums.Length);
            for (int i = 1; i <= count - 1; i++)
            {
                string str = Convert.ToString(i, 2).PadLeft(nums.Length, '0');
                for (int j = 0; j < str.Length; j++)
                {
                    if (str[j] == '1')
                    {
                        Console.Write(nums[j]);
                    }
                }
                Console.WriteLine();
            }
        }
/*
输出:
E
D
DE
C
CE
CD
CDE
B
BE
BD
BDE
BC
BCE
BCD
BCDE
A
AE
AD
ADE
AC
ACE
ACD
ACDE
AB
ABE
ABD
ABDE
ABC
ABCE
ABCD
ABCDE
*/

------解决方案--------------------
学习！！！

------解决方案--------------------
楼主写的不错，就是没有诚心与网友们分享。
试问没有注释的代码怎么分享？

------解决方案--------------------


------解决方案--------------------
学习！

------解决方案--------------------
厉害

------解决方案--------------------
刚好对我有用，谢了

------解决方案--------------------
up