如下面代码，对二维数组进行折中查询，二维与折中都第一次用，不很了解，我直接把二维理解为一个datatable好了。查询结果为一个范围，即为第几行之第几行，（数组已排序）分别是字符串查询条件与整形查询条件，代码上标注了，循环位置有一点不同。我的理解是，整体架构完全不变，改变比较条件（无论类型），同一种搜索应该都可以适用才是，可是结果总是出现偏差，请高手看下           

　　　　//字符串比较OK
            string[,] arr = new string[24, 1];
            arr[0, 0] = "A";
            arr[1, 0] = "B";
            arr[2, 0] = "B";
            arr[3, 0] = "B";
            arr[4, 0] = "C";
            arr[5, 0] = "C";
            arr[6, 0] = "C";
            arr[7, 0] = "C";
            arr[8, 0] = "C";
            arr[9, 0] = "C";
            arr[10, 0] = "D";
            arr[11, 0] = "D";
            arr[12, 0] = "D";
            arr[13, 0] = "D";
            arr[14, 0] = "D";
            arr[15, 0] = "E";
            arr[16, 0] = "E";
            arr[17, 0] = "E";
            arr[18, 0] = "F";
            arr[19, 0] = "G";
            arr[20, 0] = "G";
            arr[21, 0] = "G";
            arr[22, 0] = "S";
            arr[23, 0] = "Z";

            string IDNum = "B"; //查询字符串，动态改变值
            int login = 0;
            int end = arr.GetLength(0) - 1;
            int half = (login + end) / 2;
            string searNum = arr[half, 0];
            while (login < end && !searNum.Equals(IDNum))
            {
                if (String.Compare(searNum, IDNum) < 0)
                    login = half + 1;
                if (String.Compare(searNum, IDNum) > 0)
                    end = half - 1;
                half = (login + end) / 2;
                searNum = arr[half, 0];
            }
            int i = half;
            while (searNum.Equals(IDNum) && i > 0)
            {
                i--;
                login = i + 1;
                if (login > end)
                    login = end;
                if (i < 0) //区别位置
                    login = 0;
                searNum = arr[i, 0];
            }
            int j = half;
            searNum = arr[j, 0];
            while (searNum.Equals(IDNum) && j < arr.GetLength(0) - 1)
            {
                j++;
                end = j - 1;
                if (login > end)
                    end = login;
                if (j > arr.GetLength(0) - 1)
                    end = arr.GetLength(0) - 1;
                searNum = arr[j, 0];
            }
            Console.WriteLine(login.ToString());
            Console.WriteLine(end.ToString());

            Console.ReadLine();

——————————————————————————————————————————

   　　   //数字比较OK
            int[,] Arr = new int[24, 1];
            Arr[0, 0] = 1;
            Arr[1, 0] = 1;
            Arr[2, 0] = 1;
            Arr[3, 0] = 2;
            Arr[4, 0] = 2;
            Arr[5, 0] = 3;
            Arr[6, 0] = 3;
            Arr[7, 0] = 3;
            Arr[8, 0] = 3;
            Arr[9, 0] = 4;
            Arr[10, 0] = 4;
            Arr[11, 0] = 5;
            Arr[12, 0] = 5;
            Arr[13, 0] = 5;
            Arr[14, 0] = 6;
            Arr[15, 0] = 6;
            Arr[16, 0] = 7;
            Arr[17, 0] = 7;
            Arr[18, 0] = 7;
            Arr[19, 0] = 7;
            Arr[20, 0] = 7;
            Arr[21, 0] = 7;
            Arr[22, 0] = 8;
            Arr[23, 0] = 9;
            int IDNum = 1; //查询数字，动态改变值
            int login = 0;
            int end = Arr.GetLength(0) - 1;
            int half = (login + end) / 2;
            int searNum = Arr[half, 0];
            while (login < end && searNum != IDNum)
            {
                if (searNum < IDNum)
                    login = half + 1;
                if (searNum > IDNum)
                    end = half - 1;
                half = (login + end) / 2;
                searNum = Arr[half, 0];
            }
            int i = half;
            while (searNum == IDNum && i > 0)
            {
                i--;
                login = i + 1;
                if (login > end)
                    login = end;
                if (i == 0) //区别位置
                    login = 0;
                searNum = Arr[i, 0];
            }
            int j = half;
            searNum = Arr[j, 0];
            while (searNum == IDNum && j < Arr.GetLength(0) - 1)
            {
                j++;
                end = j - 1;
                if (login > end)
                    end = login;
                if (j > Arr.GetLength(0) - 1)
                    end = Arr.GetLength(0) - 1;
                searNum = Arr[j, 0];
            }
            Console.WriteLine(login.ToString());
            Console.WriteLine(end.ToString());

            Console.ReadLine();