YIHE_API/MadRunFabric.../NPOIHelper.cs

using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Reflection;
using System.Text;
using System.Web;
using Microsoft.AspNetCore.Http;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using NPOI.XSSF.UserModel;
using System.Runtime.Serialization;
using System.Runtime.Serialization.Formatters.Binary;
using Newtonsoft.Json.Linq;
using Newtonsoft.Json;

namespace MadRunFabric.Common
{
    public class NPOIHelper
    {
        private string _title;
        private string _sheetName;
        private string _filePath;

        /// <summary>
        /// 导出到Excel
        /// </summary>
        /// <param name="table"></param>
        /// <returns></returns>
        public bool ToExcel(DataTable table, string[] columns = null)
        {
            FileStream fs = new FileStream(this._filePath, FileMode.OpenOrCreate, FileAccess.ReadWrite);
            IWorkbook workBook = new HSSFWorkbook();
            if (string.IsNullOrWhiteSpace(this._sheetName))
            {
                this._sheetName = "sheet1";
            }

            ISheet sheet = workBook.CreateSheet(this._sheetName);

            //处理表格标题
            IRow row = sheet.CreateRow(0);
            row.CreateCell(0).SetCellValue(this._title);
            sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, table.Columns.Count - 1));
            row.Height = 500;

            ICellStyle cellStyle = workBook.CreateCellStyle();
            IFont font = workBook.CreateFont();
            font.FontName = "微软雅黑";
            font.FontHeightInPoints = 17;
            cellStyle.SetFont(font);
            cellStyle.VerticalAlignment = VerticalAlignment.Center;
            cellStyle.Alignment = HorizontalAlignment.Center;
            row.Cells[0].CellStyle = cellStyle;

            //处理表格列头
            row = sheet.CreateRow(1);
            if (columns == null)
            {
                for (int i = 0; i < table.Columns.Count; i++)
                {
                    row.CreateCell(i).SetCellValue(table.Columns[i].ColumnName);
                    row.Height = 350;
                    sheet.AutoSizeColumn(i);
                }
            }
            else
            {
                for (int i = 0; i < columns.Length; i++)
                {
                    row.CreateCell(i).SetCellValue(columns[i]);
                    row.Height = 350;
                    sheet.AutoSizeColumn(i);
                }
            }




            //处理数据内容
            for (int i = 0; i < table.Rows.Count; i++)
            {
                row = sheet.CreateRow(2 + i);
                row.Height = 250;
                for (int j = 0; j < table.Columns.Count; j++)
                {
                    row.CreateCell(j).SetCellValue(table.Rows[i][j].ToString());
                    sheet.SetColumnWidth(j, 256 * 15);
                }
            }

            //写入数据流
            workBook.Write(fs);
            fs.Flush();
            fs.Close();

            return true;
        }

        /// <summary>
        /// 导出到Excel
        /// </summary>
        /// <param name="table"></param>
        /// <param name="title"></param>
        /// <param name="sheetName">空字符串或null的话默认sheet1</param>
        /// <param name="columns">自定义表格列头，默认null</param>
        /// <returns></returns>
        public bool ToExcel(DataTable table, string title, string sheetName, string filePath, string[] columns = null)
        {
            this._title = title;
            this._sheetName = sheetName;
            this._filePath = filePath;
            return ToExcel(table, columns);
        }

        /// <summary>
        /// 弹出下载框导出excel
        /// </summary>
        /// <param name="Name"></param>
        /// <param name="dt"></param>
        /// <returns></returns>
        /*public string ExportToExcel(string Name, DataTable dt, string[] cols = null)
        {
            try
            {
                //if (dt.Rows.Count > 0)
                //{
                //HSSFWorkbook workbook = new HSSFWorkbook();
                IWorkbook workbook = new XSSFWorkbook();
                ISheet sheet = workbook.CreateSheet("Sheet1");

                    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 = HorizontalAlignment.Center;
                    HeadercellStyle.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.SkyBlue.Index;
                    HeadercellStyle.FillPattern = FillPattern.SolidForeground;
                    HeadercellStyle.FillBackgroundColor = NPOI.HSSF.Util.HSSFColor.SkyBlue.Index;

                    //字体
                    NPOI.SS.UserModel.IFont headerfont = workbook.CreateFont();
                    headerfont.Boldweight = (short)FontBoldWeight.Bold;
                    headerfont.FontHeightInPoints = 12;
                    HeadercellStyle.SetFont(headerfont);


                    //用column name 作为列名
                    int icolIndex = 0;
                    IRow headerRow = sheet.CreateRow(0);
                    if (cols == null || (cols != null && cols.Length == 0))
                    {
                        foreach (DataColumn dc in dt.Columns)
                        {
                            ICell cell = headerRow.CreateCell(icolIndex);
                            cell.SetCellValue(dc.ColumnName);
                            cell.CellStyle = HeadercellStyle;
                            icolIndex++;
                        }
                    }
                    else
                    {
                        foreach (string dc in cols)
                        {
                            ICell cell = headerRow.CreateCell(icolIndex);
                            cell.SetCellValue(dc);
                            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來看
                    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);

                    //建立内容行
                    int iRowIndex = 0;
                    foreach (DataRow dr in dt.Rows)
                    {
                        int iCellIndex = 0;
                        IRow irow = sheet.CreateRow(iRowIndex + 1);
                        for (int i = 0; i < dt.Columns.Count; i++)
                        {
                            string strsj = string.Empty;
                            if (dr[i] != null)
                            {
                                strsj = dr[i].ToString();
                            }
                            ICell cell = irow.CreateCell(iCellIndex);
                            cell.SetCellValue(strsj);
                            cell.CellStyle = cellStyle;
                            iCellIndex++;
                        }
                        iRowIndex++;
                    }

                    //自适应列宽度
                    //for (int i = 0; i < icolIndex; i++)
                    //{
                    //    sheet.AutoSizeColumn(i);
                    //}

                    using (MemoryStream ms = new MemoryStream())
                    {
                        workbook.Write(ms);

                        HttpContext curContext = HttpContext.Current;


                        // 设置编码和附件格式
                        curContext.Response.ContentType = "application/vnd.ms-excel";
                        curContext.Response.ContentEncoding = Encoding.UTF8;
                        curContext.Response.Charset = "";
                        curContext.Response.AppendHeader("Content-Disposition",
                            "attachment;filename=" + HttpUtility.UrlEncode(Name + ".xls", Encoding.UTF8));

                        curContext.Response.BinaryWrite(ms.GetBuffer());

                        workbook = null;
                        ms.Close();
                        ms.Dispose();

                        curContext.Response.End();
                    }
                //}
                return "";
            }
            catch
            {
                return "导出失败！";
            }
        }

        /// <summary>
        /// 导入excel转换为datatable
        /// </summary>
        /// <param name="upfile"></param>
        /// <param name="headrow"></param>
        /// <returns></returns>
        public DataTable ExcelToTable(HttpPostedFile upfile, int headrow)
        {
            DataTable dt = new DataTable();

            IWorkbook workbook = null;

            Stream stream = upfile.InputStream;

            string suffix = upfile.FileName.Substring(upfile.FileName.LastIndexOf(".") + 1).ToLower();
            if (suffix == "xlsx") // 2007版本
            {
                workbook = new XSSFWorkbook(stream);
            }
            else if (suffix == "xls") // 2003版本
            {
                workbook = new HSSFWorkbook(stream);
            }

            //获取excel的第一个sheet
            ISheet sheet = workbook.GetSheetAt(0);

            //获取sheet的第一行
            IRow headerRow = sheet.GetRow(headrow);

            //一行最后一个方格的编号 即总的列数
            int cellCount = headerRow.LastCellNum;
            //最后一列的标号  即总的行数
            int rowCount = sheet.LastRowNum;
            //列名
            for (int i = 0; i < cellCount; i++)
            {
                dt.Columns.Add(headerRow.GetCell(i).ToString());
            }

            for (int i = (sheet.FirstRowNum + headrow + 1); i <= sheet.LastRowNum; i++)
            {
                DataRow dr = dt.NewRow();

                IRow row = sheet.GetRow(i);
                for (int j = row.FirstCellNum; j < cellCount; j++)
                {
                    if (row.GetCell(j) != null)
                    {
                        dr[j] = row.GetCell(j).ToString();
                    }
                }

                dt.Rows.Add(dr);
            }

            sheet = null;
            workbook = null;

            return dt;
        }*/


        /// <summary>
        /// 导入excel转换为datatable
        /// </summary>
        /// <param name="upfile"></param>
        /// <param name="headrow"></param>
        /// <returns></returns>
        public DataTable ExcelToTable1(Microsoft.AspNetCore.Http.IFormFile upfile, int headrow)
        {
            DataTable dt = new DataTable();
            try
            {

                IWorkbook workbook = null;

                Stream stream = upfile.OpenReadStream();

                string suffix = upfile.FileName.Substring(upfile.FileName.LastIndexOf(".") + 1).ToLower();

                if (suffix == "xlsx") // 2007版本
                {
                    workbook = new XSSFWorkbook(stream);
                }
                else if (suffix == "xls") // 2003版本
                {
                    workbook = new HSSFWorkbook(stream);
                }

                //获取excel的第一个sheet
                ISheet sheet = workbook.GetSheetAt(0);

                //获取sheet的第一行
                IRow headerRow = sheet.GetRow(headrow);

                //一行最后一个方格的编号 即总的列数
                int cellCount = headerRow.LastCellNum;
                //最后一列的标号  即总的行数
                int rowCount = sheet.LastRowNum;
                //列名
                for (int i = 0; i < cellCount; i++)
                {
                    dt.Columns.Add(headerRow.GetCell(i).ToString());
                }

                for (int i = (sheet.FirstRowNum + headrow + 1); i <= sheet.LastRowNum; i++)
                {
                    DataRow dr = dt.NewRow();

                    IRow row = sheet.GetRow(i);
                    for (int j = row.FirstCellNum; j < cellCount; j++)
                    {
                        if (row.GetCell(j) != null)
                        {
                            dr[j] = row.GetCell(j).ToString();
                        }
                    }

                    dt.Rows.Add(dr);
                }

                sheet = null;
                workbook = null;
            }
            catch (Exception ex)
            {
                //
            }
            return dt;
        }

        /// <summary>
        /// 导入excel转换为datatable
        /// </summary>
        /// <param name="upfile"></param>
        /// <param name="headrow"></param>
        /// <returns></returns>
        public DataTable ExcelToTable(string fileName, int headrow)
        {
            DataTable dt = new DataTable();

            IWorkbook workbook = null;

            Stream stream = new FileStream(fileName, FileMode.OpenOrCreate);

            string suffix = fileName.Substring(fileName.LastIndexOf(".") + 1).ToLower();
            if (suffix == "xlsx") // 2007版本
            {
                workbook = new XSSFWorkbook(stream);
            }
            else if (suffix == "xls") // 2003版本
            {
                workbook = new HSSFWorkbook(stream);
            }

            //获取excel的第一个sheet]
            ISheet sheet = workbook.GetSheetAt(0);

            //获取sheet的第一行
            IRow headerRow = sheet.GetRow(headrow);

            //一行最后一个方格的编号 即总的列数
            int cellCount = headerRow.LastCellNum;
            //最后一列的标号  即总的行数
            int rowCount = sheet.LastRowNum;
            //列名
            for (int i = 0; i < cellCount; i++)
            {
                dt.Columns.Add(headerRow.GetCell(i).ToString());
            }

            for (int i = (sheet.FirstRowNum + headrow + 1); i <= sheet.LastRowNum; i++)
            {
                DataRow dr = dt.NewRow();

                IRow row = sheet.GetRow(i);
                for (int j = row.FirstCellNum; j < cellCount; j++)
                {
                    if (row.GetCell(j) != null)
                    {
                        dr[j] = row.GetCell(j).ToString();
                    }
                }

                dt.Rows.Add(dr);
            }

            sheet = null;
            workbook = null;

            return dt;
        }


        /// <summary>
        /// 下载模板
        /// </summary>
        /// <param name="cols"></param>
        /// <returns></returns>
        public byte[] ExportToExcelTemplate(string[] cols)
        {
            IWorkbook workbook = new XSSFWorkbook();
            ISheet sheet = workbook.CreateSheet("Sheet1");

            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 = HorizontalAlignment.Center;
            HeadercellStyle.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.SkyBlue.Index;
            HeadercellStyle.FillPattern = FillPattern.SolidForeground;
            HeadercellStyle.FillBackgroundColor = NPOI.HSSF.Util.HSSFColor.SkyBlue.Index;

            //字体
            NPOI.SS.UserModel.IFont headerfont = workbook.CreateFont();
            headerfont.Boldweight = (short)FontBoldWeight.Bold;
            headerfont.FontHeightInPoints = 12;
            HeadercellStyle.SetFont(headerfont);

            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來看
            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);


            //用column name 作为列名
            int icolIndex = 0;
            IRow headerRow = sheet.CreateRow(0);

            foreach (string dc in cols)
            {
                ICell cell = headerRow.CreateCell(icolIndex);
                cell.SetCellValue(dc);
                cell.CellStyle = HeadercellStyle;

                sheet.SetDefaultColumnStyle(icolIndex, cellStyle);

                icolIndex++;
            }

            using (MemoryStream ms = new MemoryStream())
            {
                workbook.Write(ms);
                byte[] bs = ms.ToArray();

                workbook = null;
                ms.Close();
                ms.Dispose();

                return bs;
            }
        }

        /// <summary>
        /// 下载excel
        /// </summary>
        /// <param name="cols"></param>
        /// <returns></returns>
        public byte[] ExportToExcel(List<object> objs, string[] cols = null, string[] colname = null)
        {
            IWorkbook workbook = new XSSFWorkbook();
            ISheet sheet = workbook.CreateSheet("Sheet1");

            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 = HorizontalAlignment.Center;
            HeadercellStyle.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.SkyBlue.Index;
            HeadercellStyle.FillPattern = FillPattern.SolidForeground;
            HeadercellStyle.FillBackgroundColor = NPOI.HSSF.Util.HSSFColor.SkyBlue.Index;

            //字体
            NPOI.SS.UserModel.IFont headerfont = workbook.CreateFont();
            headerfont.Boldweight = (short)FontBoldWeight.Bold;
            headerfont.FontHeightInPoints = 12;
            HeadercellStyle.SetFont(headerfont);



            if (objs.Count > 0)
            {
                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來看
                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);

                int icolIndex = 0;
                IRow headerRow = sheet.CreateRow(0);

                if (cols == null)
                {
                    //var pis = ((Newtonsoft.Json.Linq.JObject)objs[0]).GetType().GetProperties();
                    var pis = objs[0].GetType().GetProperties();
                    cols = new string[pis.Length];
                    for (int i = 0; i < pis.Length; i++)
                    {
                        //cols[i] = pis[i].Name;
                        cols[i] = pis[i].GetValue(objs[0],null).ToString();
                    }

                    // cols = new string[objs.Columns.Count];
                    //for (int i = 0; i < objs.Columns.Count; i++)
                    //{
                    //    cols[i] = objs.Columns[i].ColumnName;
                    //}
                }
                foreach (string dc in cols)
                {
                    ICell cell = headerRow.CreateCell(icolIndex);
                    cell.SetCellValue(dc);
                    cell.CellStyle = HeadercellStyle;

                    sheet.SetDefaultColumnStyle(icolIndex, cellStyle);

                    icolIndex++;
                }

                //建立内容行
                int iRowIndex = 0;
                //if (colname != null)
                //{
                //    foreach (var item in colname)
                //    {
                //        for (int j = 0; j < objs.Columns.Count; j++)
                //        {
                //            if (objs.Columns[j].ColumnName == item)
                //            {
                //                string strsj = string.Empty;
                //                if (objs.Rows[i][j] != null)
                //                {
                //                    strsj = objs.Rows[i][j].ToString();
                //                }
                //                ICell cell = irow.CreateCell(iCellIndex);
                //                cell.SetCellValue(strsj);
                //                //cell.CellStyle = cellStyle;
                //                iCellIndex++;
                //            }
                //        }
                //    }
                //}
                //else
                //{

                foreach (var obj in objs)
                {
                    PropertyInfo[] jobj = obj.GetType().GetProperties();
                    var dd = obj.ToJson();
                    //var jobj = (Newtonsoft.Json.Linq.JObject)obj;

                    int iCellIndex = 0;
                    IRow irow = sheet.CreateRow(iRowIndex + 1);
                    for (int i = 0; i < cols.Length; i++)
                    {
                        string strsj = string.Empty;
                        if (jobj[i].GetValue(obj, null) != null)
                        {
                            strsj = jobj[i].GetValue(obj, null).ToString();
                        }
                        ICell cell = irow.CreateCell(iCellIndex);
                        cell.SetCellValue(strsj);
                        //cell.CellStyle = cellStyle;
                        iCellIndex++;
                    }
                    iRowIndex++;
                }
                //}
            }

            using (MemoryStream ms = new MemoryStream())
            {
                workbook.Write(ms);
                byte[] bs = ms.ToArray();

                workbook = null;
                ms.Close();
                ms.Dispose();

                return bs;
            }
        }


        /// <summary>
        /// 下载excel
        /// </summary>
        /// <param name="cols"></param>
        /// <returns></returns>
        public byte[] ExportToExcel1(DataTable objs, string[] cols = null, string[] colname = null)
        {
            IWorkbook workbook = new XSSFWorkbook();
            ISheet sheet = workbook.CreateSheet("Sheet1");

            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 = HorizontalAlignment.Center;
            HeadercellStyle.FillForegroundColor = NPOI.HSSF.Util.HSSFColor.SkyBlue.Index;
            HeadercellStyle.FillPattern = FillPattern.SolidForeground;
            HeadercellStyle.FillBackgroundColor = NPOI.HSSF.Util.HSSFColor.SkyBlue.Index;

            //字体
            NPOI.SS.UserModel.IFont headerfont = workbook.CreateFont();
            headerfont.Boldweight = (short)FontBoldWeight.Bold;
            headerfont.FontHeightInPoints = 12;
            HeadercellStyle.SetFont(headerfont);



            if (objs.Rows.Count > 0)
            {
                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來看
                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);

                int icolIndex = 0;
                IRow headerRow = sheet.CreateRow(0);

                if (cols == null)
                {

                    cols = new string[objs.Columns.Count];
                    for (int i = 0; i < objs.Columns.Count; i++)
                    {
                        cols[i] = objs.Columns[i].ColumnName;
                    }


                }
                foreach (string dc in cols)
                {
                    ICell cell = headerRow.CreateCell(icolIndex);
                    cell.SetCellValue(dc);
                    cell.CellStyle = HeadercellStyle;

                    sheet.SetDefaultColumnStyle(icolIndex, cellStyle);

                    icolIndex++;
                }
                //处理数据内容
                //建立内容行
                int iRowIndex = 0;
                for (int i = 0; i < objs.Rows.Count; i++)
                {
                    //var jobj = (Newtonsoft.Json.Linq.JObject)obj;
                    int iCellIndex = 0;
                    IRow irow = sheet.CreateRow(iRowIndex + 1);


                    if (colname != null)
                    {
                        foreach (var item in colname)
                        {
                            for (int j = 0; j < objs.Columns.Count; j++)
                            {
                                if (objs.Columns[j].ColumnName == item)
                                {
                                    string strsj = string.Empty;
                                    if (objs.Rows[i][j] != null)
                                    {
                                        strsj = objs.Rows[i][j].ToString();
                                    }
                                    ICell cell = irow.CreateCell(iCellIndex);
                                    cell.SetCellValue(strsj);
                                    cell.CellStyle = cellStyle;
                                    iCellIndex++;
                                }
                            }
                        }
                    }
                    else
                    {
                        for (int j = 0; j < objs.Columns.Count; j++)
                        {
                            //row.CreateCell(j).SetCellValue(table.Rows[i][j].ToString());
                            //sheet.SetColumnWidth(j, 256 * 15);
                            string strsj = string.Empty;
                            if (objs.Rows[i][j] != null)
                            {
                               strsj = objs.Rows[i][j].ToString();
                              
                            }
                            ICell cell = irow.CreateCell(iCellIndex);
                            cell.SetCellValue(strsj);
                            cell.CellStyle = cellStyle;
                            iCellIndex++;
                        }
                      
                    }

                    iRowIndex++;
                }


            }
            //自适应列宽度
            for (int i = 0; i < objs.Rows.Count; i++)
            {
                sheet.AutoSizeColumn(i);
            }
            using (MemoryStream ms = new MemoryStream())
            {
                workbook.Write(ms);
                byte[] bs = ms.ToArray();

                workbook = null;
                ms.Close();
                ms.Dispose();

                return bs;
            }
        }
        
    }

}