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/// <summary>

        /// 在DataTable中添加一序号列，编号从1依次递增

        /// </summary>

        /// <param >DataTable</param>

        /// <returns></returns>

        private DataTable AddSeriNumToDataTable(DataTable dt)

        {

            //需要返回的值

            DataTable dtNew;

            if (dt.Columns.IndexOf("序号") >= )

            {

                dtNew = dt;

            }

            else //添加一序号列,并且在第一列

            {

                int rowLength = dt.Rows.Count;

                int  colLength= dt.Columns.Count;

                DataRow[] newRows = new DataRow[rowLength];

                dtNew = new DataTable();

                //在第一列添加“序号”列

                dtNew.Columns.Add("序号");

                for (int i = ; i < colLength; i++)

                {

                    dtNew.Columns.Add(dt.Columns[i].ColumnName);

                    //复制dt中的数据

                    for (int j = ; j < rowLength; j++)

                    {

                        if (newRows[j] == null)

                            newRows[j] = dtNew.NewRow();

                        //将其他数据填充到第二列之后，因为第一列为新增的序号列

                        newRows[j][i+] = dt.Rows[j][i];

                    }

                }

                foreach (DataRow row in newRows)

                {

                    dtNew.Rows.Add(row);

                }

            }

            //对序号列填充，从1递增

            for (int i = ; i < dt.Rows.Count; i++)

            {

                dtNew.Rows[i]["序号"] = i + ;

            }

            return dtNew;           

        }