自己写的二维数据冒泡排序算法，待排序的哪一列需要为数字类型(String类型的数字也可)

#region 二维数组排序 
        public static string[,] ArrSort(this string[,] sourceArr, int sortIndex, string sortType)
        {
            int row = sourceArr.GetLength(0);
            int col = sourceArr.GetLength(1);
            string[] tempArr = new string[col];
            if (sortType == "降序")
            {
                for (int i = row - 1; i >= 0; i--)
                {
                    for (int j = 0; j <= i - 1; j++)
                    {
                        if (Convert.ToInt32(sourceArr[j, sortIndex]) <= Convert.ToInt32(sourceArr[j + 1, sortIndex]))
                        {
                            for (int k = 0; k < col; k++)
                            {
                                tempArr[k] = sourceArr[j, k];
                                sourceArr[j, k] = sourceArr[j + 1, k];
                                sourceArr[j + 1, k] = tempArr[k];
                            }
                        }
                    }
                }
            }
            else
            {
                for (int i = row - 1; i >= 0; i--)
                {
                    for (int j = 0; j <= i - 1; j++)
                    {
                        if (Convert.ToInt32(sourceArr[j, sortIndex]) >= Convert.ToInt32(sourceArr[j + 1, sortIndex]))
                        {
                            for (int k = 0; k < col; k++)
                            {
                                tempArr[k] = sourceArr[j, k];
                                sourceArr[j, k] = sourceArr[j + 1, k];
                                sourceArr[j + 1, k] = tempArr[k];
                            }
                        }
                    }
                }
            }

            return sourceArr;

        }
        #endregion