C#中怎么使用NPOI读取excel转为DataSet

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NPOI读取excel转为DataSet

/// 
/// 读取Execl数据到DataTable(DataSet)中/// 
/// 指定Execl文件路径/// 设置第一行是否是列名/// 返回一个DataTable数据集public static DataSet ExcelToDataSet(string filePath, bool isFirstLineColumnName)   {       DataSet dataSet = new DataSet();       int startRow = 0;       try            {                using (FileStream fs = File.OpenRead(filePath))                {                    IWorkbook workbook = null;                    // 如果是2007+的Excel版本                    if (filePath.IndexOf(".xlsx") > 0)                    {                        workbook = new XSSFWorkbook(fs);                    }                    // 如果是2003-的Excel版本                    else if (filePath.IndexOf(".xls") > 0)                    {                            workbook = new HSSFWorkbook(fs);                    }                    if (workbook != null)                    {                        //循环读取Excel的每个sheet，每个sheet页都转换为一个DataTable，并放在DataSet中                        for (int p = 0; p < workbook.NumberOfSheets; p++)                        {                            ISheet sheet = workbook.GetSheetAt(p);                            DataTable dataTable = new DataTable();                            dataTable.TableName = sheet.SheetName;                            if (sheet != null)                            {                                int rowCount = sheet.LastRowNum;//获取总行数                                if (rowCount > 0)                                {                                    IRow firstRow = sheet.GetRow(0);//获取第一行                                    int cellCount = firstRow.LastCellNum;//获取总列数                                    //构建datatable的列                                    if (isFirstLineColumnName)                                    {                                        startRow = 1;//如果第一行是列名，则从第二行开始读取                                        for (int i = firstRow.FirstCellNum; i < cellCount; ++i)                                        {                                            ICell cell = firstRow.GetCell(i);                                            if (cell != null)                                            {                                                if (cell.StringCellValue != null)                                                {                                                    DataColumn column = new DataColumn(cell.StringCellValue);                                                    dataTable.Columns.Add(column);                                                }                                            }                                        }                                    }                                    else                                    {                                        for (int i = firstRow.FirstCellNum; i < cellCount; ++i)                                        {                                            DataColumn column = new DataColumn("column" + (i + 1));                                            dataTable.Columns.Add(column);                                        }                                    }                                    //填充行                                    for (int i = startRow; i <= rowCount; ++i)                                    {                                        IRow row = sheet.GetRow(i);                                        if (row == null) continue;                                        DataRow dataRow = dataTable.NewRow();                                        for (int j = row.FirstCellNum; j < cellCount; ++j)                                        {                                            ICell cell = row.GetCell(j);                                            if (cell == null)                                            {                                                dataRow[j] = "";                                            }                                            else                                            {                                                //CellType(Unknown = -1,Numeric = 0,String = 1,Formula = 2,Blank = 3,Boolean = 4,Error = 5,)                                                switch (cell.CellType)                                                {                                                    case CellType.Blank:                                                        dataRow[j] = "";                                                        break;                                                    case CellType.Numeric:                                                        short format = cell.CellStyle.DataFormat;                                                        //对时间格式（2015.12.5、2015/12/5、2015-12-5等）的处理                                                        if (format == 14 || format == 22 || format == 31 || format == 57 || format == 58)                                                            dataRow[j] = cell.DateCellValue;                                                        else                                                            dataRow[j] = cell.NumericCellValue;                                                        break;                                                    case CellType.String:                                                        dataRow[j] = cell.StringCellValue;                                                        break;                                                }                                            }                                        }                                        dataTable.Rows.Add(dataRow);                                    }                                }                            }                            dataSet.Tables.Add(dataTable);                        }                    }                }                return dataSet;            }            catch (Exception ex)            {                var msg = ex.Message;                return null;            }}

Dataset 导出为Excel

/// 
/// 将DataTable(DataSet)导出到Execl文档/// 
/// 传入一个DataSet/// 导出路径（可以不加扩展名，不加默认为.xls）/// 返回一个Bool类型的值，表示是否导出成功/// True表示导出成功，Flase表示导出失败public static bool DataTableToExcel(DataSet dataSet, string Outpath)    {            bool result = false;            try            {                if (dataSet == null || dataSet.Tables == null || dataSet.Tables.Count == 0 || string.IsNullOrEmpty(Outpath))                    throw new Exception("输入的DataSet或路径异常");                int sheetIndex = 0;                //根据输出路径的扩展名判断workbook的实例类型                IWorkbook workbook = null;                string pathExtensionName = Outpath.Trim().Substring(Outpath.Length - 5);                if (pathExtensionName.Contains(".xlsx"))                {                    workbook = new XSSFWorkbook();                }                else if(pathExtensionName.Contains(".xls"))                {                    workbook = new HSSFWorkbook();                }                else                {                    Outpath = Outpath.Trim() + ".xls";                    workbook = new HSSFWorkbook();                }                //将DataSet导出为Excel                foreach (DataTable dt in dataSet.Tables)                {                    sheetIndex++;                    if (dt != null && dt.Rows.Count > 0)                    {                        ISheet sheet = workbook.CreateSheet(string.IsNullOrEmpty(dt.TableName) ? ("sheet" + sheetIndex) : dt.TableName);//创建一个名称为Sheet0的表                        int rowCount = dt.Rows.Count;//行数                        int columnCount = dt.Columns.Count;//列数                        //设置列头                        IRow row = sheet.CreateRow(0);//excel第一行设为列头                        for (int c = 0; c < columnCount; c++)                        {                            ICell cell = row.CreateCell(c);                            cell.SetCellValue(dt.Columns[c].ColumnName);                        }                        //设置每行每列的单元格,                        for (int i = 0; i < rowCount; i++)                        {                            row = sheet.CreateRow(i + 1);                            for (int j = 0; j < columnCount; j++)                            {                                ICell cell = row.CreateCell(j);//excel第二行开始写入数据                                cell.SetCellValue(dt.Rows[i][j].ToString());                            }                        }                    }                }                //向outPath输出数据                using (FileStream fs = File.OpenWrite(Outpath))                {                    workbook.Write(fs);//向打开的这个xls文件中写入数据                    result = true;                }                return result;            }            catch (Exception ex)            {                return false;            }        }    }

调用方法

DataSet set = ExcelHelper.ExcelToDataTable("test.xlsx", true);//Excel导入  bool b = ExcelHelper.DataTableToExcel(set, "test2.xlsx");//导出Excel

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