static void Main(string[] args)        {            string[] arr = new string[] { "AAA", "BBBB", "CCCC", "DDDD", "EEEEEE", "ffffff", "ggggggg", "hhhhhh", "iii", "", "jjj", "kkk" };            string findStr = "kkk";            for (int i = 0; i < arr.Length; i++)            {                if (object.ReferenceEquals(findStr, arr[i]))                    Console.Write(" true1 ");            }            Console.WriteLine();            Console.Write("input string kkk :");            string inputStr = Console.ReadLine();            if (CompareStringInArrar( inputStr, arr))            {                Console.WriteLine(" true2 ");            }            ///////////////////////            Console.WriteLine("一千萬次字符串數組元素查找：");            System.Threading.Thread.Sleep(3000);            long ticks = DateTime.Now.Ticks;            for (int i = 0; i < 10000000; i++)            {                CompareStringInArrar(inputStr, arr);            }            Console.WriteLine("自定義數組查找(Ticks)：              {0}", DateTime.Now.Ticks - ticks);            ////////////////////////////////////////            System.Threading.Thread.Sleep(3000);            ticks = DateTime.Now.Ticks;            for (int i = 0; i < 10000000; i++)            {                FindStringInArrar0(ref findStr, arr);            }            Console.WriteLine("直接對象地址相等進行數組查找(Ticks)：{0}", DateTime.Now.Ticks - ticks);            ///////////////////////////////////            System.Threading.Thread.Sleep(3000);            ticks = DateTime.Now.Ticks;            for (int i = 0; i < 10000000; i++)            {                FindStringInArrar(ref inputStr, arr);            }            Console.WriteLine("直接遍歷進行數組查找(Ticks)：        {0}", DateTime.Now.Ticks - ticks);            ///////////////////////////////////            System.Threading.Thread.Sleep(3000);            ticks = DateTime.Now.Ticks;            for (int i = 0; i < 10000000; i++)            {                CompareStringInArrar2( inputStr, arr);            }            Console.WriteLine("混合數組查找(Ticks)：                {0}", DateTime.Now.Ticks - ticks);                      Console.Read();            //DBMethod();        }        PRivate static bool FindStringInArrar0(ref string inputStr, string[] arr)        {            for (int j = 0; j < arr.Length; j++)            {                if (object.ReferenceEquals(inputStr, arr[j]))                    return true;            }            return false;        }        private static bool FindStringInArrar(ref string inputStr, string[] arr)        {            for (int j = 0; j < arr.Length; j++)            {                if (inputStr == arr[j])                    return true;            }            return false;        }        private static bool CompareStringInArrar( string inputStr, string[] arr)        {            //char[] inputCharArr = inputStr.ToCharArray();            int length = inputStr.Length;            bool flag = true;            //string strTemp = null;            for (int i = 0; i < arr.Length; i++)            {                //strTemp = arr[i];                if (length == arr[i].Length)                {                    flag = true;                    for (int j = 0; j < length; j++)                    {                        if (inputStr[j] != arr[i][j])                        {                            flag = false;                            break;                        }                    }                    if (flag)                        return true;                }            }            return false;        }        /// <summary>        /// 混合查找        /// </summary>        /// <param name="inputStr"></param>        /// <param name="arr"></param>        /// <returns></returns>        private static bool CompareStringInArrar2(string inputStr, string[] arr)        {            //char[] inputCharArr = inputStr.ToCharArray();            int length = inputStr.Length;            bool flag = true;            //string strTemp = null;            for (int i = 0; i < arr.Length; i++)            {                if (object.ReferenceEquals(inputStr, arr[i]))                    return true;                //strTemp = arr[i];                if (length == arr[i].Length)                {                    flag = true;                    for (int j = 0; j < length; j++)                    {                        if (inputStr[j] != arr[i][j])                        {                            flag = false;                            break;                        }                    }                    if (flag)                        return true;                }            }            return false;        }

class Program    {        static void Main(string[] args)        {            string A = "124Abc";            string B = "2345b";            string C = "124abce";            Console.WriteLine("input string(123Abc):");            string D = Console.ReadLine();            string E = "124Abc";            long ticks = 0;            long ticks2 = 0;            long ticks3 = 0;            long ticks4 = 0;            long ticks5 = 0;                        Stopwatch sw = Stopwatch.StartNew();            //預熱            for (int i = 0; i < 1000000; i++)            {                bool b1 = string.Compare(A, B, StringComparison.OrdinalIgnoreCase) == 0;            }            //開始            sw.Reset();            sw.Start();            for (int i = 0; i < 1000000; i++)            {                bool b1 = string.Compare(A, D, StringComparison.OrdinalIgnoreCase) == 0;            }            ticks = sw.ElapsedTicks;            sw.Reset();            sw.Start();            for (int i = 0; i < 1000000; i++)            {                bool b2 = string.Equals(A, C, StringComparison.OrdinalIgnoreCase);            }            ticks2 = sw.ElapsedTicks;            sw.Reset();            sw.Start();            for (int i = 0; i < 1000000; i++)            {                bool b2 = string.Equals(A, D, StringComparison.OrdinalIgnoreCase);            }            ticks3 = sw.ElapsedTicks;            sw.Reset();            sw.Start();            for (int i = 0; i < 1000000; i++)            {                bool b2 = string.Equals(A, E, StringComparison.OrdinalIgnoreCase);            }            ticks4 = sw.ElapsedTicks;            sw.Reset();            sw.Start();            for (int i = 0; i < 1000000; i++)            {                bool b2 = A.Length== C.Length && string.Equals(A, C, StringComparison.OrdinalIgnoreCase);            }            ticks5 = sw.ElapsedTicks;            Console.WriteLine("{0},/r/n{1},/r/n{2},/r/n{3},/r/n{4}/r/n", ticks, ticks2, ticks3, ticks4, ticks5);            Console.Read();        }    }

input string(123Abc):123Abc87806,15255,58227,7569,1939