C#把excel数据转换成DataTable

     

       private DataTable TurnExcelToDataTable(string path)
        {
            try
            {
                if (Path.GetExtension(path).Contains("xlsx"))  //office版本2007及以上
                {
                    XSSFWorkbook hssfworkbook = null;
                    using (FileStream file = new FileStream(path, FileMode.Open, FileAccess.Read))
                    {
                        hssfworkbook = new XSSFWorkbook(file);
                    }

                    //第一个sheet页
                    ISheet sheet = hssfworkbook.GetSheetAt(0);
                    string sheetName = hssfworkbook.GetSheetName(0);
                    DataTable dt = new DataTable();
                    IRow headerRow = sheet.GetRow(0);
                    int cellCount = headerRow.LastCellNum;
                    for (int i = headerRow.FirstCellNum; i < cellCount; i++)
                    {
                        DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
                        dt.Columns.Add(column);
                    }
                    int rowCount = sheet.LastRowNum;
                    for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
                    {
                        IRow row = sheet.GetRow(i);
                        DataRow dataRow = dt.NewRow();

                        if (row != null)
                        {
                            for (int j = row.FirstCellNum; j < cellCount; j++)
                            {
                                if (row.GetCell(j) != null)
                                    dataRow[j] = row.GetCell(j).ToString();
                                else dataRow[j] = "";
                            }
                            dt.Rows.Add(dataRow);
                        }
                    }
                    sheet = null;
                    hssfworkbook = null;
                    return dt;
                }
                else
                {
                    HSSFWorkbook hssfworkbook = null;
                    using (FileStream file = new FileStream(path, FileMode.Open, FileAccess.Read))
                    {
                        hssfworkbook = new HSSFWorkbook(file);
                    }

                    //第一个sheet
                    ISheet sheet = hssfworkbook.GetSheetAt(0);
                    string sheetName = hssfworkbook.GetSheetName(0);
                    DataTable dt = new DataTable();
                    IRow headerRow = sheet.GetRow(0);
                    int cellCount = headerRow.LastCellNum;
                    for (int i = headerRow.FirstCellNum; i < cellCount; i++)
                    {
                        DataColumn column = new DataColumn(headerRow.GetCell(i).StringCellValue);
                        dt.Columns.Add(column);
                    }
                    int rowCount = sheet.LastRowNum;
                    for (int i = (sheet.FirstRowNum + 1); i <= sheet.LastRowNum; i++)
                    {
                        IRow row = sheet.GetRow(i);
                        DataRow dataRow = dt.NewRow();
                        for (int j = row.FirstCellNum; j < cellCount; j++)
                        {
                            if (row.GetCell(j) != null)
                                dataRow[j] = row.GetCell(j).ToString();
                            else dataRow[j] = "";
                        }
                        dt.Rows.Add(dataRow);
                    }
                    sheet = null;
                    hssfworkbook = null;
                    return dt;
                }
            }
            catch(exception ex)
            {

                MessageBox.show(ex.message);
                return null;
            }
        }

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