C# Excel互转DataTable

public class NPOIHelper
    {
        /// 

        /// 将excel导入到datatable
        /// 
        /// excel路径
        /// 第一行是否是列名
        /// 返回datatable
        public static System.Data.DataTable ExcelToDataTable(string filePath, bool isColumnName, string userad)
        {
            System.Data.DataTable dataTable = null;
            FileStream fs = null;
            DataColumn column = null;
            DataRow dataRow = null;
            IWorkbook workbook = null;
            ISheet sheet = null;
            IRow row = null;
            ICell cell = null;
            int startRow = 0;
            try
            {
                using (fs = File.OpenRead(filePath))
                {
                    // 2007版本
                    if (filePath.ToLower().IndexOf(".xlsx") > 0)
                        workbook = new XSSFWorkbook(fs);
                    // 2003版本
                    else if (filePath.ToLower().IndexOf(".xls") > 0)
                        workbook = new HSSFWorkbook(fs);

                    if (workbook != null)
                    {
                        sheet = workbook.GetSheetAt(0);//读取第一个sheet，当然也可以循环读取每个sheet
                        dataTable = new System.Data.DataTable();
                        if (sheet != null)
                        {
                            int rowCount = sheet.LastRowNum;//总行数
                            if (rowCount > 0)
                            {
                                IRow firstRow = sheet.GetRow(0);//第一行
                                int cellCount = firstRow.LastCellNum;//列数

                                //构建datatable的列
                                if (isColumnName)
                                {
                                    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)
                                    {
                                        cell = firstRow.GetCell(i);
                                        if (cell != null)
                                        {
                                            if (cell.StringCellValue != null)
                                            {
                                                column = new DataColumn(cell.StringCellValue);
                                                dataTable.Columns.Add(column);
                                            }
                                        }
                                    }
                                    //添加创建人
                                    DataColumn lastdc = new DataColumn("Createby");
                                    dataTable.Columns.Add(lastdc);
                                }
                                else
                                {
                                    for (int i = firstRow.FirstCellNum; i < cellCount; ++i)
                                    {
                                        column = new DataColumn("column" + (i + 1));
                                        dataTable.Columns.Add(column);
                                    }
                                }

                                //填充行
                                for (int i = startRow; i <= rowCount; ++i)
                                {
                                    row = sheet.GetRow(i);
                                    if (row == null) continue;

                                    dataRow = dataTable.NewRow();
                                    for (int j = row.FirstCellNum; j < cellCount; ++j)
                                    {
                                        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 == 31 || format == 57 || format == 58)
                                                    {
                                                        if (DateUtil.IsCellDateFormatted(cell))
                                                        {
                                                            dataRow[j] = cell.DateCellValue.Date.ToString();
                                                        }
                                                    }
                                                    else
                                                    {
                                                        dataRow[j] = cell.NumericCellValue;
                                                    }

                                                    break;

                                                case CellType.String:
                                                    dataRow[j] = cell.StringCellValue;
                                                    break;
                                            }
                                        }
                                        //为创建人赋值
                                        dataRow[cellCount] = userad;
                                    }
                                    //去除空白行数据
                                    bool rowdataisnull = true;
                                    for (int k = row.FirstCellNum; k < cellCount - 1; ++k)
                                    {
                                        if (!string.IsNullOrEmpty(dataRow[k] as string))
                                        {
                                            rowdataisnull = false;
                                        }
                                    }
                                    if (!rowdataisnull)
                                    {
                                        dataTable.Rows.Add(dataRow);
                                    }
                                }
                            }
                        }
                    }
                }
                return dataTable;
            }
            catch (Exception ex)
            {
                if (fs != null)
                {
                    fs.Close();
                }
                return null;
            }
        }

        /// 

        /// 写入excel
        /// 
        /// datatable
        /// strFile
        /// 
        public static bool DataTableToExcel(System.Data.DataTable dt, string strFile)
        {
            bool result = false;
            IWorkbook workbook = null;
            FileStream fs = null;
            IRow row = null;
            ISheet sheet = null;
            ICell cell = null;
            try
            {
                if (dt != null && dt.Rows.Count > 0)
                {
                    workbook = new HSSFWorkbook();
                    sheet = workbook.CreateSheet("Sheet0");//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
                    row = sheet.CreateRow(0);//excel第一行设为列头
                    for (int c = 0; c < columnCount; c++)
                    {
                        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++)
                        {
                            cell = row.CreateCell(j);//excel第二行开始写入数据
                            cell.SetCellValue(dt.Rows[i][j].ToString());
                        }
                    }
                    using (fs = File.OpenWrite(strFile))
                    {
                        workbook.Write(fs);//向打开的这个xls文件中写入数据
                        result = true;
                    }
                }
                return result;
            }
            catch (Exception ex)
            {
                if (fs != null)
                {
                    fs.Close();
                }
                return false;
            }
        }

        /// 

        /// Excel导入成Datable
        /// 
        /// 导入路径(包含文件名与扩展名)
        /// 
        public static System.Data.DataTable ExcelToTable(string file)
        {
            System.Data.DataTable dt = new System.Data.DataTable();
            IWorkbook workbook;
            string fileExt = Path.GetExtension(file).ToLower();
            using (FileStream fs = new FileStream(file, FileMode.Open, FileAccess.Read))
            {
                //XSSFWorkbook 适用XLSX格式，HSSFWorkbook 适用XLS格式
                if (fileExt == ".xlsx") { workbook = new XSSFWorkbook(fs); } else if (fileExt == ".xls") { workbook = new HSSFWorkbook(fs); } else { workbook = null; }
                if (workbook == null) { return null; }
                ISheet sheet = workbook.GetSheetAt(0);

                //表头
                IRow header = sheet.GetRow(sheet.FirstRowNum);
                List columns = new List();
                for (int i = 0; i < header.LastCellNum; i++)
                {
                    object obj = GetValueType(header.GetCell(i));
                    if (obj == null || obj.ToString() == string.Empty)
                    {
                        dt.Columns.Add(new DataColumn("Columns" + i.ToString()));
                    }
                    else
                        dt.Columns.Add(new DataColumn(obj.ToString()));
                    columns.Add(i);
                }
                //数据
                for (int i = sheet.FirstRowNum + 1; i <= sheet.LastRowNum; i++)
                {
                    DataRow dr = dt.NewRow();
                    bool hasValue = false;
                    foreach (int j in columns)
                    {
                        dr[j] = GetValueType(sheet.GetRow(i).GetCell(j));
                        if (dr[j] != null && dr[j].ToString() != string.Empty)
                        {
                            hasValue = true;
                        }
                    }
                    if (hasValue)
                    {
                        dt.Rows.Add(dr);
                    }
                }
            }
            return dt;
        }

        /// 

        /// Datable导出成Excel
        /// 
        /// 
        /// 导出路径(包括文件名与扩展名)
        public static void TableToExcel(System.Data.DataTable dt, string file)
        {
            IWorkbook workbook;
            string fileExt = Path.GetExtension(file).ToLower();
            if (fileExt == ".xlsx") { workbook = new XSSFWorkbook(); } else if (fileExt == ".xls") { workbook = new HSSFWorkbook(); } else { workbook = null; }
            if (workbook == null) { return; }
            ISheet sheet = string.IsNullOrEmpty(dt.TableName) ? workbook.CreateSheet("Sheet1") : workbook.CreateSheet(dt.TableName);

            //表头
            IRow row = sheet.CreateRow(0);
            for (int i = 0; i < dt.Columns.Count; i++)
            {
                ICell cell = row.CreateCell(i);
                cell.SetCellValue(dt.Columns[i].ColumnName);
            }

            //数据
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                IRow row1 = sheet.CreateRow(i + 1);
                for (int j = 0; j < dt.Columns.Count; j++)
                {
                    ICell cell = row1.CreateCell(j);
                    cell.SetCellValue(dt.Rows[i][j].ToString());
                }
            }

            //转为字节数组
            MemoryStream stream = new MemoryStream();
            workbook.Write(stream);
            var buf = stream.ToArray();

            //保存为Excel文件
            using (FileStream fs = new FileStream(file, FileMode.Create, FileAccess.Write))
            {
                fs.Write(buf, 0, buf.Length);
                fs.Flush();
            }
        }

        /// 

        /// 获取单元格类型
        /// 
        /// 
        /// 
        private static object GetValueType(ICell cell)
        {
            if (cell == null)
                return null;
            switch (cell.CellType)
            {
                case CellType.Blank: //BLANK:
                    return null;

                case CellType.Boolean: //BOOLEAN:
                    return cell.BooleanCellValue;

                case CellType.Numeric: //NUMERIC:
                    return cell.NumericCellValue;

                case CellType.String: //STRING:
                    return cell.StringCellValue;

                case CellType.Error: //ERROR:
                    return cell.ErrorCellValue;

                case CellType.Formula: //FORMULA:
                default:
                    return "=" + cell.CellFormula;
            }
        }

        public static bool TableToExcelSheet(List dts, string strExcelFileName, string shieetName)
        {
            bool BSave = false;
            var indexType = 1;
            try
            {
                IWorkbook workbook;
                string fileExt = Path.GetExtension(strExcelFileName).ToLower();
                if (fileExt == ".xlsx") { workbook = new XSSFWorkbook(); } else if (fileExt == ".xls") { workbook = new HSSFWorkbook(); } else { workbook = null; }
                if (workbook == null) { return false; }

                DataSet set = new DataSet();
                foreach (DataTable dt in dts)
                {
                    ISheet sheet = workbook.CreateSheet(dt.TableName);
                    ICellStyle HeadercellStyle = workbook.CreateCellStyle();
                    HeadercellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
                    HeadercellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
                    HeadercellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
                    HeadercellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
                    HeadercellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
                    //字体
                    NPOI.SS.UserModel.IFont headerfont = workbook.CreateFont();
                    headerfont.Boldweight = (short)FontBoldWeight.Bold;
                    HeadercellStyle.SetFont(headerfont);


                    //用column name 作为列名
                    int icolIndex = 0;
                    IRow headerRow = sheet.CreateRow(0);
                    foreach (DataColumn item in dt.Columns)
                    {
                        ICell cell = headerRow.CreateCell(icolIndex);
                        cell.SetCellValue(item.ColumnName);
                        cell.CellStyle = HeadercellStyle;
                        icolIndex++;
                    }


                    ICellStyle cellStyle = workbook.CreateCellStyle();
                    //为避免日期格式被Excel自动替换，所以设定 format 为 『@』 表示一率当成text来看
                    cellStyle.DataFormat = HSSFDataFormat.GetBuiltinFormat("@");
                    cellStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
                    cellStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
                    cellStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
                    cellStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;
                    NPOI.SS.UserModel.IFont cellfont = workbook.CreateFont();
                    cellfont.Boldweight = (short)FontBoldWeight.Normal;
                    cellStyle.SetFont(cellfont);
                    if (indexType == 1)
                    {
                        //建立内容行
                        int iRowIndex = 1;
                        int iCellIndex = 0;
                        foreach (DataRow Rowitem in dt.Rows)
                        {
                            IRow DataRow = sheet.CreateRow(iRowIndex);
                            foreach (DataColumn Colitem in dt.Columns)
                            {


                                ICell cell = DataRow.CreateCell(iCellIndex);
                                cell.SetCellValue(Rowitem[Colitem].ToString());
                                cell.CellStyle = cellStyle;
                                iCellIndex++;
                            }
                            iCellIndex = 0;
                            iRowIndex++;
                        }
                        //自适应列宽
                        for (int i = 0; i < icolIndex; i++)
                        {
                            sheet.AutoSizeColumn(i);
                        }
                    }

                }
                MemoryStream stream = new MemoryStream();
                workbook.Write(stream);
                var buf = stream.ToArray();
                //保存为Excel文件
                using (FileStream fs = new FileStream(strExcelFileName, FileMode.Create, FileAccess.Write))
                {
                    fs.Write(buf, 0, buf.Length);
                    fs.Flush();
                }

                //FileStream file = new FileStream(strExcelFileName, FileMode.OpenOrCreate);
                //workbook.Write(file);
                //file.Flush();
                //file.Close();
                BSave = true;
            }
            catch (Exception ex)
            {
                throw new Exception(ex.Message);
            }
            return BSave;


        }
    }