#region 删除DataTable重复列，类似distinct
        /// <summary>   
        /// 删除DataTable重复列，类似distinct   
        /// </summary>   
        /// <param name="dt">DataTable</param>   
        /// <param name="Field">字段名</param>   
        /// <returns></returns>   
        public static DataTable DeleteSameRow(DataTable dt, string Field)
        {
            ArrayList indexList = new ArrayList();
            // 找出待删除的行索引   
            for (int i = 0; i < dt.Rows.Count - 1; i++)
            {
                if (!IsContain(indexList, i))
                {
                    for (int j = i + 1; j < dt.Rows.Count; j++)
                    {
                        if (dt.Rows[i][Field].ToString() == dt.Rows[j][Field].ToString())
                        {
                            indexList.Add(j);
                        }
                    }
                }
            }
            indexList.Sort();
            // 排序
            for (int i = indexList.Count - 1; i >= 0; i--)// 根据待删除索引列表删除行  
            {
                int index = Convert.ToInt32(indexList[i]);
                dt.Rows.RemoveAt(index);
            }
            return dt;
        }

        /// <summary>   
        /// 判断数组中是否存在   
        /// </summary>   
        /// <param name="indexList">数组</param>   
        /// <param name="index">索引</param>   
        /// <returns></returns>   
        public static bool IsContain(ArrayList indexList, int index)
        {
            for (int i = 0; i < indexList.Count; i++)
            {
                int tempIndex = Convert.ToInt32(indexList[i]);
                if (tempIndex == index)
                {
                    return true;
                }
            }
            return false;
        }
        #endregion