使用OpenXml把Excel中的数据导出到DataSet中

public class OpenXmlHelper
{
    /// <summary>
    /// 读取Excel数据到DataSet中，默认读取所有Sheet中的数据
    /// </summary>
    /// <param name="filePath">Excel文件路径</param>
    /// <param name="sheetNames">Sheet名称列表，默认为null查询所有Sheet中的数据</param>
    /// <returns></returns>
    public static DataSet ReadExcel(string filePath, List<string> sheetNames = null)
    {
        try
        {
            using (SpreadsheetDocument doc = SpreadsheetDocument.Open(filePath, true))
            {
                IEnumerable<Sheet> sheets = doc.WorkbookPart.Workbook.Descendants<Sheet>();
                if (sheetNames != null && sheetNames.Count > 0)
                {
                    sheets = sheets.Where(s => sheetNames.Contains(s.Name));
                }
                DataSet ds = new DataSet();
                SharedStringTable stringTable = doc.WorkbookPart.SharedStringTablePart.SharedStringTable;
                foreach (Sheet sheet in sheets)
                {
                    WorksheetPart sheetPart = (WorksheetPart)doc.WorkbookPart.GetPartById(sheet.Id);
                    IEnumerable<Row> rows = sheetPart.Worksheet.Descendants<Row>();
                    DataTable dt = new DataTable(sheet.Name);
                    foreach (Row row in rows)
                    {
                        if (row.RowIndex == 1)
                        {
                            GetDataColumn(row, stringTable, dt);
                        }
                        GetDataRow(row, stringTable, dt);
                    }
                    ds.Tables.Add(dt);
                }
                return ds;
            }
        }
        catch (Exception ex)
        {
            //MessageBox.Show(ex.Message);
            return null;
        }
    }

    /// <summary>
    /// 把Spreadsheet行中的数据导出到DataTable中。
    /// </summary>
    /// <param name="row">Spreadsheet行</param>
    /// <param name="stringTable">共享字符串表</param>
    /// <param name="dt">DataTable</param>
    private static void GetDataRow(Row row, SharedStringTable stringTable, DataTable dt)
    {
        DataRow dr = dt.NewRow();
        string cellValue = string.Empty;
        int i = 0;
        int nullCellCount = i;
        foreach (Cell cell in row)
        {
            cellValue = GetCellValue(cell, stringTable);
            if (cellValue == string.Empty)
                nullCellCount++;
            dr[i] = cellValue;
            i++;
        }
        //如果一整行数据都没有数据，则不添加此行到DataTable中
        if (nullCellCount != i)
            dt.Rows.Add(dr);
    }

    /// <summary>
    /// 从Spreadsheet行中读取表头信息
    /// </summary>
    /// <param name="row">Spreadsheet行</param>
    /// <param name="stringTable">共享字符串表</param>
    /// <param name="dt">DataTable</param>
    private static void GetDataColumn(Row row, SharedStringTable stringTable, DataTable dt)
    {
        DataColumn col = new DataColumn();
        Dictionary<string, int> columnCountDict = new Dictionary<string, int>();
        foreach (Cell cell in row)
        {
            string cellValue = GetCellValue(cell, stringTable);
            col = new DataColumn(cellValue);
            //由于Excel中的数据表列标题可以重复，而DataTable中不允许重复，因此在重复的列标题后追加递增数字
            if (dt != null && dt.Columns.Contains(cellValue))
            {
                if (!columnCountDict.ContainsKey(cellValue))
                {
                    columnCountDict.Add(cellValue, 0);
                }
                col.ColumnName = cellValue + (columnCountDict[cellValue]++);
            }
            dt.Columns.Add(col);
        }
    }

    /// <summary>
    /// 获取Spreadsheet单元格的值
    /// </summary>
    /// <param name="cell">Spreadsheet单元格</param>
    /// <param name="stringTable">共享字符串表</param>
    /// <returns>Spreadsheet单元格的值</returns>
    private static string GetCellValue(Cell cell, SharedStringTable stringTable)
    {
        string value = string.Empty;
        try
        {
            if (cell.ChildElements.Count == 0)
            {
                return value;
            }
            value = cell.CellValue.InnerText;
            if (cell.DataType != null && cell.DataType == CellValues.SharedString)
            {
                value = stringTable.ChildElements[int.Parse(value)].InnerText;
            }
        }
        catch (Exception)
        {
            value = "N/A";
        }
        return value;
    }
}