c#_导出table功能

一：第一张导出方法，简单快捷   请注意：一般表格都有真分页，查询数据时候注意把分页条件去掉

#region 此处是获取的list数组 然后转table再调用ExportExcel

　　　　　　var list="你的list数据库源"
            DataTable dt = new DataTable();
            dt.Columns.Add("序号", typeof(string));
            dt.Columns.Add("姓名", typeof(string));
          int datacount = 1;
            foreach (var item in list)//list给table赋值
            {
                DataRow tr = dt.NewRow();
                tr[0] = datacount;
                tr[1] = item.XM;
               
                datacount++;
            }
//然后调用

ExportExcel（"dt","文件名字"）
//或者直接调用

ExportExcel（"table数据源","文件名字"）

 /// <summary>
        /// 导出功能    此方法直接给table 和导出的文件名即可 已经封装好 直接调用
        /// </summary>
        /// <param name="dt">数据源</param>
        /// <param name="tablename">导出的名字</param>

        public void ExportExcel(DataTable dt, string filename)
        {


            string path = AppDomain.CurrentDomain.BaseDirectory + @"" + filename + ".xls";
            WriteExcel(dt, path);
            System.IO.FileInfo filet = new System.IO.FileInfo(path);
            Response.Clear();
            Response.Charset = "GB2312";
            Response.ContentEncoding = System.Text.Encoding.UTF8;
            Response.AddHeader("Content-Disposition", "attachment; filename=" + Server.UrlEncode(filename + ".xls"));
            Response.AddHeader("Content-Length", filet.Length.ToString());
            Response.ContentType = "application/ms-excel";
            Response.WriteFile(filet.FullName);
            Response.End();

          
        }
        public void WriteExcel(DataTable dt, string path)
        {
            try
            {
                long totalCount = dt.Rows.Count;
                long rowRead = 0;
                float percent = 0;
                System.IO.StreamWriter sw = new System.IO.StreamWriter(path, false, System.Text.Encoding.GetEncoding("gb2312"));
                System.Text.StringBuilder sb = new System.Text.StringBuilder();
                for (int k = 0; k < dt.Columns.Count; k++)
                {
                    sb.Append(dt.Columns[k].ColumnName.ToString() + "     	");
                }
                sb.Append(Environment.NewLine);

                for (int i = 0; i < dt.Rows.Count; i++)
                {
                    rowRead++;
                    percent = ((float)(100 * rowRead)) / totalCount;
                    for (int j = 0; j < dt.Columns.Count; j++)
                    {
                        sb.Append(dt.Rows[i][j].ToString() + "	");
                    }
                    sb.Append(Environment.NewLine);
                }
                sw.Write(sb.ToString());
                sw.Flush();
                sw.Close();
            }
            catch (Exception ex)
            {
            }
        }
此导出方式实际是.CSV(数字与纯文本格式)能用excel打开而已  所以在设置导出格式无能为力（如时间格式就会出现问题）

 

二：第二种，能改变导出excel格式

  引用 NPOI文件来进行 导出，  也是封装好的， 只需要把相对应的引用文件  引用好直接调用就可以

引用到的NPOI 

 请注意： 此方法无法用于AJAX ，可解决导出时间或者身份证显示######问题

 例子

    //前台调用导出按钮
            $("#WriteDoctor").click(function () {
              
                var StartTime = $("#startDate").val();
                var EndTime = $("#endDate").val();
                var Department = $(".drop_btn .drop_btn_val").text();
                var DoctorName = $(".drop_btn2 .drop_btn_val").text();
                if (Department == "全部") {
                    Department = ""
                }
                if (DoctorName == "全部") {
                    DoctorName = ""
                }
                window.location.href = "@Url.Action("WriteDoctor")?StartTime=" + StartTime + "&EndTime=" + EndTime ；
               
            })



  //后台方法
        public ActionResult WriteDoctor(DateTime StartTime)
        {
                   
            DataSet ds = 去查询数据库数据(DateTIme, StarTime);

            string paths = "table表名字" + DateTime.Now.ToString("yyyyMMdd") + ".xls"; 
      
           
            NPOIHelper.ExportByWeb(ds, "table表名字" + DateTime.Now.ToString("yyyyMMdd"), paths);

            return Json(new { success = true }, JsonRequestBehavior.AllowGet);
        }

　　

using NPOI.HPSF;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.SS.Util;
using NPOI.XSSF.UserModel;
using System;
using System.Collections.Generic;
using System.Data;
using System.IO;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Web; //引用  System.Web
using System.Collections.Generic;


namespace DBUtility
{
    public class NPOIHelper
    {
        /// <summary>
        /// DataTable导出到Excel文件
        /// </summary>
        /// <param name="dtSource">源DataTable</param>
        /// <param name="strHeaderText">表头文本</param>
        /// <param name="strFileName">保存位置</param>
        public static void Export(DataTable dtSource, string strHeaderText, string strFileName)
        {
            using (MemoryStream ms = Export(dtSource, strHeaderText))
            {
                using (FileStream fs = new FileStream(strFileName, FileMode.Create, FileAccess.Write))
                {
                    byte[] data = ms.ToArray();
                    fs.Write(data, 0, data.Length);
                    fs.Flush();
                }
            }
        }

        /// <summary>
        /// DataTable导出到Excel的MemoryStream
        /// </summary>
        /// <param name="dtSource">源DataTable</param>
        /// <param name="strHeaderText">表头文本</param>
        public static MemoryStream Export(DataTable dtSource, string strHeaderText)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            ISheet sheet = workbook.CreateSheet();

            #region 右击文件 属性信息
            {
                DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
                dsi.Company = "";
                workbook.DocumentSummaryInformation = dsi;

                SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
                si.Author = ""; //填加xls文件作者信息
                si.ApplicationName = ""; //填加xls文件创建程序信息
                si.LastAuthor = ""; //填加xls文件最后保存者信息
                si.Comments = ""; //填加xls文件作者信息
                si.Title = ""; //填加xls文件标题信息
                si.Subject = "";//填加文件主题信息
                si.CreateDateTime = DateTime.Now;
                workbook.SummaryInformation = si;
            }
            #endregion

            ICellStyle dateStyle = workbook.CreateCellStyle();
            IDataFormat format = workbook.CreateDataFormat();
            ICellStyle dataStyle = workbook.CreateCellStyle();
            dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
            dateStyle.Alignment = HorizontalAlignment.Center;
            dateStyle.VerticalAlignment = VerticalAlignment.Center;
            dateStyle.BorderBottom = BorderStyle.Thin;
            dateStyle.BorderLeft = BorderStyle.Thin;
            dateStyle.BorderRight = BorderStyle.Thin;
            dateStyle.BorderTop = BorderStyle.Thin;
            //-----
            dataStyle.Alignment = HorizontalAlignment.Center;
            dataStyle.VerticalAlignment = VerticalAlignment.Center;
            dataStyle.BorderBottom = BorderStyle.Thin;
            dataStyle.BorderLeft = BorderStyle.Thin;
            dataStyle.BorderRight = BorderStyle.Thin;
            dataStyle.BorderTop = BorderStyle.Thin;
            //取得列宽
            int[] arrColWidth = new int[dtSource.Columns.Count];
            foreach (DataColumn item in dtSource.Columns)
            {
                arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
            }
            for (int i = 0; i < dtSource.Rows.Count; i++)
            {
                for (int j = 0; j < dtSource.Columns.Count; j++)
                {
                    int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
                    if (intTemp > arrColWidth[j])
                    {
                        arrColWidth[j] = intTemp;
                    }
                }
            }
            int rowIndex = 0;
            foreach (DataRow row in dtSource.Rows)
            {
                #region 新建表，填充表头，填充列头，样式
                if (rowIndex == 65535 || rowIndex == 0)
                {
                    if (rowIndex != 0)
                    {
                        sheet = workbook.CreateSheet();
                    }

                    #region 表头及样式
                    {
                        IRow headerRow = sheet.CreateRow(0);
                        headerRow.HeightInPoints = 25;
                        headerRow.CreateCell(0).SetCellValue(strHeaderText);
                        ICellStyle headStyle = workbook.CreateCellStyle();
                        headStyle.Alignment = HorizontalAlignment.Center;
                        headStyle.VerticalAlignment = VerticalAlignment.Center;
                        IFont font = workbook.CreateFont();
                        font.FontHeightInPoints = 12;
                        font.Boldweight = 600;
                        headStyle.SetFont(font);
                        headerRow.GetCell(0).CellStyle = headStyle;
                        sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));

                    }
                    #endregion


                    #region 列头及样式
                    {
                        IRow headerRow = sheet.CreateRow(1);
                        ICellStyle headStyle = workbook.CreateCellStyle();
                        headStyle.Alignment = HorizontalAlignment.Center;
                        headStyle.VerticalAlignment = VerticalAlignment.Center;
                        headStyle.BorderBottom = BorderStyle.Thin;
                        headStyle.BorderLeft = BorderStyle.Thin;
                        headStyle.BorderRight = BorderStyle.Thin;
                        headStyle.BorderTop = BorderStyle.Thin;
                        IFont font = workbook.CreateFont();
                        font.FontHeightInPoints = 10;
                        font.Boldweight = 600;
                        headStyle.SetFont(font);
                        foreach (DataColumn column in dtSource.Columns)
                        {
                            headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                            headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

                            //设置列宽
                            sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
                        }
                        //  headerRow.Dispose();
                    }
                    #endregion

                    rowIndex = 2;
                }
                #endregion


                #region 填充内容
                IRow dataRow = sheet.CreateRow(rowIndex);
                foreach (DataColumn column in dtSource.Columns)
                {
                    ICell newCell = dataRow.CreateCell(column.Ordinal);

                    string drValue = row[column].ToString();

                    switch (column.DataType.ToString())
                    {
                        case "System.String"://字符串类型
                            newCell.SetCellValue(drValue);
                            newCell.CellStyle = dataStyle;
                            break;
                        case "System.DateTime"://日期类型
                            DateTime dateV;
                            DateTime.TryParse(drValue, out dateV);
                            newCell.SetCellValue(dateV);

                            newCell.CellStyle = dateStyle;//格式化显示
                            break;
                        case "System.Boolean"://布尔型
                            bool boolV = false;
                            bool.TryParse(drValue, out boolV);
                            newCell.SetCellValue(boolV);
                            newCell.CellStyle = dataStyle;
                            break;
                        case "System.Int16"://整型
                        case "System.Int32":
                        case "System.Int64":
                        case "System.Byte":
                            int intV = 0;
                            int.TryParse(drValue, out intV);
                            newCell.SetCellValue(intV);
                            newCell.CellStyle = dataStyle;
                            break;
                        case "System.Decimal"://浮点型
                        case "System.Double":
                            double doubV = 0;
                            double.TryParse(drValue, out doubV);
                            newCell.SetCellValue(doubV);
                            newCell.CellStyle = dataStyle;
                            break;
                        case "System.DBNull"://空值处理
                            newCell.SetCellValue("");
                            newCell.CellStyle = dataStyle;
                            break;
                        default:
                            newCell.SetCellValue("");
                            newCell.CellStyle = dataStyle;
                            break;
                    }

                }
                #endregion

                rowIndex++;
            }
            using (MemoryStream ms = new MemoryStream())
            {
                workbook.Write(ms);
                ms.Flush();
                ms.Position = 0;
                ////workbook.c
                // workbook
                //workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
                return ms;
            }
        }

        /// <summary>
        /// DataTable导出到Excel的MemoryStream
        /// </summary>
        /// <param name="dtSource">源DataSet</param>
        /// <param name="strHeaderText">表头文本</param>
        public static MemoryStream ExportMoreTable(DataSet dsSource, string strHeaderText)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();

            foreach (DataTable dtSource in dsSource.Tables)
            {
                ISheet sheet = workbook.CreateSheet();

                #region 右击文件 属性信息
                {
                    DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
                    dsi.Company = "";
                    workbook.DocumentSummaryInformation = dsi;

                    SummaryInformation si = PropertySetFactory.CreateSummaryInformation();
                    si.Author = ""; //填加xls文件作者信息
                    si.ApplicationName = ""; //填加xls文件创建程序信息
                    si.LastAuthor = ""; //填加xls文件最后保存者信息
                    si.Comments = ""; //填加xls文件作者信息
                    si.Title = ""; //填加xls文件标题信息
                    si.Subject = "";//填加文件主题信息
                    si.CreateDateTime = DateTime.Now;
                    workbook.SummaryInformation = si;
                }
                #endregion

                ICellStyle dateStyle = workbook.CreateCellStyle();
                IDataFormat format = workbook.CreateDataFormat();
                ICellStyle dataStyle = workbook.CreateCellStyle();
                dateStyle.DataFormat = format.GetFormat("yyyy-mm-dd");
                dateStyle.Alignment = HorizontalAlignment.Center;
                dateStyle.VerticalAlignment = VerticalAlignment.Center;
                dateStyle.BorderBottom = BorderStyle.Thin;
                dateStyle.BorderLeft = BorderStyle.Thin;
                dateStyle.BorderRight = BorderStyle.Thin;
                dateStyle.BorderTop = BorderStyle.Thin;
                //-----
                dataStyle.Alignment = HorizontalAlignment.Center;
                dataStyle.VerticalAlignment = VerticalAlignment.Center;
                dataStyle.BorderBottom = BorderStyle.Thin;
                dataStyle.BorderLeft = BorderStyle.Thin;
                dataStyle.BorderRight = BorderStyle.Thin;
                dataStyle.BorderTop = BorderStyle.Thin;
                //取得列宽
                int[] arrColWidth = new int[dtSource.Columns.Count];
                foreach (DataColumn item in dtSource.Columns)
                {
                    arrColWidth[item.Ordinal] = Encoding.GetEncoding(936).GetBytes(item.ColumnName.ToString()).Length;
                }
                for (int i = 0; i < dtSource.Rows.Count; i++)
                {
                    for (int j = 0; j < dtSource.Columns.Count; j++)
                    {
                        int intTemp = Encoding.GetEncoding(936).GetBytes(dtSource.Rows[i][j].ToString()).Length;
                        if (intTemp > arrColWidth[j])
                        {
                            arrColWidth[j] = intTemp;
                        }
                    }
                }
                int rowIndex = 0;
                foreach (DataRow row in dtSource.Rows)
                {
                    #region 新建表，填充表头，填充列头，样式
                    if (rowIndex == 65535 || rowIndex == 0)
                    {
                        if (rowIndex != 0)
                        {
                            sheet = workbook.CreateSheet();
                        }

                        #region 表头及样式
                        {
                            IRow headerRow = sheet.CreateRow(0);
                            headerRow.HeightInPoints = 25;
                            headerRow.CreateCell(0).SetCellValue(strHeaderText);
                            ICellStyle headStyle = workbook.CreateCellStyle();
                            headStyle.Alignment = HorizontalAlignment.Center;
                            headStyle.VerticalAlignment = VerticalAlignment.Center;
                            IFont font = workbook.CreateFont();
                            font.FontHeightInPoints = 12;
                            font.Boldweight = 600;
                            headStyle.SetFont(font);
                            headerRow.GetCell(0).CellStyle = headStyle;
                            sheet.AddMergedRegion(new CellRangeAddress(0, 0, 0, dtSource.Columns.Count - 1));

                        }
                        #endregion


                        #region 列头及样式
                        {
                            IRow headerRow = sheet.CreateRow(1);
                            ICellStyle headStyle = workbook.CreateCellStyle();
                            headStyle.Alignment = HorizontalAlignment.Center;
                            headStyle.VerticalAlignment = VerticalAlignment.Center;
                            headStyle.BorderBottom = BorderStyle.Thin;
                            headStyle.BorderLeft = BorderStyle.Thin;
                            headStyle.BorderRight = BorderStyle.Thin;
                            headStyle.BorderTop = BorderStyle.Thin;
                            IFont font = workbook.CreateFont();
                            font.FontHeightInPoints = 10;
                            font.Boldweight = 600;
                            headStyle.SetFont(font);
                            foreach (DataColumn column in dtSource.Columns)
                            {
                                headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                                headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

                                //设置列宽
                                sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
                            }
                            //  headerRow.Dispose();
                        }
                        #endregion

                        rowIndex = 2;
                    }
                    #endregion


                    #region 填充内容
                    IRow dataRow = sheet.CreateRow(rowIndex);
                    foreach (DataColumn column in dtSource.Columns)
                    {
                        ICell newCell = dataRow.CreateCell(column.Ordinal);

                        string drValue = row[column].ToString();

                        switch (column.DataType.ToString())
                        {
                            case "System.String"://字符串类型
                                newCell.SetCellValue(drValue);
                                newCell.CellStyle = dataStyle;
                                break;
                            case "System.DateTime"://日期类型
                                DateTime dateV;
                                DateTime.TryParse(drValue, out dateV);
                                newCell.SetCellValue(dateV);

                                newCell.CellStyle = dateStyle;//格式化显示
                                break;
                            case "System.Boolean"://布尔型
                                bool boolV = false;
                                bool.TryParse(drValue, out boolV);
                                newCell.SetCellValue(boolV);
                                newCell.CellStyle = dataStyle;
                                break;
                            case "System.Int16"://整型
                            case "System.Int32":
                            case "System.Int64":
                            case "System.Byte":
                                int intV = 0;
                                int.TryParse(drValue, out intV);
                                newCell.SetCellValue(intV);
                                newCell.CellStyle = dataStyle;
                                break;
                            case "System.Decimal"://浮点型
                            case "System.Double":
                                double doubV = 0;
                                double.TryParse(drValue, out doubV);
                                newCell.SetCellValue(doubV);
                                newCell.CellStyle = dataStyle;
                                break;
                            case "System.DBNull"://空值处理
                                newCell.SetCellValue("");
                                newCell.CellStyle = dataStyle;
                                break;
                            default:
                                newCell.SetCellValue("");
                                newCell.CellStyle = dataStyle;
                                break;
                        }

                    }
                    #endregion

                    rowIndex++;
                }
            }




            using (MemoryStream ms = new MemoryStream())
            {
                workbook.Write(ms);
                ms.Flush();
                ms.Position = 0;
                ////workbook.c
                // workbook
                //workbook.Dispose();//一般只用写这一个就OK了，他会遍历并释放所有资源，但当前版本有问题所以只释放sheet
                return ms;
            }
        }
        ///// <summary>
        ///// 用于Web网页 直接导出
        ///// </summary>
        ///// <param name="dtSource">源DataTable</param>
        ///// <param name="strHeaderText">表头文本</param>
        ///// <param name="strFileName">文件名</param>
        public static void ExportByWeb(DataSet dtSource, string strHeaderText, string strFileName)
        {
            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(strFileName, Encoding.UTF8));

            curContext.Response.BinaryWrite(ExportMoreTable(dtSource, strHeaderText).GetBuffer());
            curContext.Response.End();
        }

        public static void ExportByWeb(MemoryStream file, string strFileName)
        {
            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(strFileName, Encoding.UTF8));

            curContext.Response.BinaryWrite(file.ToArray());
            curContext.Response.End();
        }

        /// <summary>读取excel
        /// 默认第一行为标头
        /// </summary>
        /// <param name="strFileName">excel文档路径</param>
        /// <returns></returns>
        public static DataTable Import(string strFileName)
        {

            DataTable dt = new DataTable();
            //XSSFWorkbook xhssfworkbook;
            HSSFWorkbook hssfworkbook;
            using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
            {
                hssfworkbook = new HSSFWorkbook(file);
            }
            ISheet sheet = hssfworkbook.GetSheetAt(0);
            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

            IRow headerRow = sheet.GetRow(0);
            int cellCount = headerRow.LastCellNum;

            for (int j = 0; j < cellCount; j++)
            {
                ICell cell = headerRow.GetCell(j);
                dt.Columns.Add(cell.ToString());
            }

            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();
                }

                dt.Rows.Add(dataRow);
            }
            return dt;
        }

        public static DataTable ImportOther(string strFileName)
        {

            DataTable dt = new DataTable();
            HSSFWorkbook hssfworkbook;
            XSSFWorkbook xhssfworkbook;

            ISheet sheet = null;
            using (FileStream file = new FileStream(strFileName, FileMode.Open, FileAccess.Read))
            {
                if (!strFileName.Contains(".xlsx"))
                {
                    hssfworkbook = new HSSFWorkbook(file);
                    sheet = hssfworkbook.GetSheetAt(0);
                }
                else
                {
                    xhssfworkbook = new XSSFWorkbook(file);
                    sheet = xhssfworkbook.GetSheetAt(0);
                }
            }

            System.Collections.IEnumerator rows = sheet.GetRowEnumerator();

            IRow headerRow = sheet.GetRow(0);
            int cellCount = headerRow.LastCellNum;

            for (int j = 0; j < cellCount; j++)
            {
                ICell cell = headerRow.GetCell(j);
                dt.Columns.Add(cell.ToString());
            }

            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();
                }

                dt.Rows.Add(dataRow);
            }
            return dt;
        }

        /// <summary>
        /// 将datatable导出为excel
        /// 图片默认显示在excel 第二行最后一列
        /// </summary>
        /// <param name="table">数据源</param>
        /// <param name="excelInfo">Tuple<excel列名,datatable列名,excel列宽度></param>
        /// <param name="sheetName">工作簿名称</param>
        /// <param name="picBytes">导出图片字节流</param>
        /// <param name="mergedRegion">合并单元格信息：null不合并单元格</param>
        /// <returns></returns>
        public static MemoryStream ExportToExcel2007(DataTable table, List<Tuple<string, string, int>> excelInfo, string sheetName, byte[] picBytes, List<CellRangeAddress> mergedRegion)
        {
            MemoryStream ms = new MemoryStream();
            try
            {
                using (table)
                {
                    IWorkbook workbook = new XSSFWorkbook();
                    ISheet sheet = workbook.CreateSheet(sheetName);
                    for (int i = 0; i < excelInfo.Count; i++)
                    {
                        sheet.SetColumnWidth(i, excelInfo[i].Item3 * 256);
                    }
                    IRow headerRow = sheet.CreateRow(0);
                    for (int i = 0; i < excelInfo.Count; i++)
                    {
                        headerRow.CreateCell(i).SetCellValue(excelInfo[i].Item1);
                    }
                    int rowIndex = 1;
                    foreach (DataRow row in table.Rows)
                    {
                        IRow dataRow = sheet.CreateRow(rowIndex);
                        for (int i = 0; i < excelInfo.Count; i++)
                        {
                            dataRow.CreateCell(i).SetCellValue(row[excelInfo[i].Item2].ToString());
                        }
                        rowIndex++;
                    }
                    //合并单元格
                    if (mergedRegion != null && mergedRegion.Count > 0)
                    {
                        foreach (CellRangeAddress cellRangeAddress in mergedRegion)
                        {
                            //设置一个合并单元格区域，使用上下左右定义CellRangeAddress区域
                            //CellRangeAddress四个参数为：起始行，结束行，起始列，结束列
                            sheet.AddMergedRegion(cellRangeAddress);
                            ICellStyle style = workbook.CreateCellStyle();

                            //设置单元格的样式：水平对齐居中
                            style.Alignment = HorizontalAlignment.Center;
                            //将新的样式赋给单元格
                            var cell = sheet.GetRow(cellRangeAddress.FirstRow).GetCell(cellRangeAddress.FirstColumn);
                            cell.CellStyle = style;
                        }
                    }
                    //插入图片
                    if (picBytes != null && picBytes.Length > 0)
                    {
                        var row1 = 2;
                        var col1 = excelInfo.Count + 1;
                        /* Add Picture to Workbook, Specify picture type as PNG and Get an Index */
                        int pictureIdx = workbook.AddPicture(picBytes, NPOI.SS.UserModel.PictureType.PNG);  //添加图片
                        /* Create the drawing container */
                        XSSFDrawing drawing = (XSSFDrawing)sheet.CreateDrawingPatriarch();
                        /* Create an anchor point */
                        XSSFClientAnchor anchor = new XSSFClientAnchor(0, 0, 0, 240, col1, row1, col1 + 1, row1 + 1);

                        /* Invoke createPicture and pass the anchor point and ID */
                        XSSFPicture picture = (XSSFPicture)drawing.CreatePicture(anchor, pictureIdx);
                        /* Call resize method, which resizes the image */
                        picture.Resize();

                        picBytes = null;
                    }
                    workbook.Write(ms);
                    // workbook.Close();
                }
            }
            catch (Exception ex)
            {
                ms = null;
            }
            return ms;
        }
        /// <summary>
        /// 将datatable导出为excel
        /// 图片默认显示在excel 第二行最后一列
        /// </summary>
        /// <param name="table">数据源</param>
        /// <param name="excelInfo">Tuple<excel列名,datatable列名,excel列宽度></param>
        /// <param name="sheetName">工作簿名称</param>
        /// <param name="picBytes">导出图片字节流</param>
        /// <param name="mergedRegion">合并单元格信息：null不合并单元格</param>
        /// <returns></returns>
        public static MemoryStream ExportToExcel97(DataTable table, List<Tuple<string, string, int>> excelInfo, string sheetName, byte[] picBytes, List<CellRangeAddress> mergedRegion)
        {
            MemoryStream ms = new MemoryStream();
            try
            {
                using (table)
                {
                    IWorkbook workbook = new HSSFWorkbook();
                    ISheet sheet = workbook.CreateSheet(sheetName);
                    for (int i = 0; i < excelInfo.Count; i++)
                    {
                        sheet.SetColumnWidth(i, excelInfo[i].Item3 * 256);
                    }
                    IRow headerRow = sheet.CreateRow(0);
                    for (int i = 0; i < excelInfo.Count; i++)
                    {
                        headerRow.CreateCell(i).SetCellValue(excelInfo[i].Item1);
                    }
                    int rowIndex = 1;
                    foreach (DataRow row in table.Rows)
                    {
                        IRow dataRow = sheet.CreateRow(rowIndex);
                        for (int i = 0; i < excelInfo.Count; i++)
                        {
                            dataRow.CreateCell(i).SetCellValue(row[excelInfo[i].Item2].ToString());
                        }
                        rowIndex++;
                    }
                    //合并单元格
                    if (mergedRegion != null && mergedRegion.Count > 0)
                    {
                        foreach (CellRangeAddress cellRangeAddress in mergedRegion)
                        {
                            //设置一个合并单元格区域，使用上下左右定义CellRangeAddress区域
                            //CellRangeAddress四个参数为：起始行，结束行，起始列，结束列
                            sheet.AddMergedRegion(cellRangeAddress);
                            ICellStyle style = workbook.CreateCellStyle();

                            //设置单元格的样式：水平对齐居中
                            style.Alignment = HorizontalAlignment.Center;
                            //将新的样式赋给单元格
                            var cell = sheet.GetRow(cellRangeAddress.FirstRow).GetCell(cellRangeAddress.FirstColumn);
                            cell.CellStyle = style;
                        }

                    }
                    //插入图片
                    if (picBytes != null && picBytes.Length > 0)
                    {
                        var row1 = 2;
                        var col1 = excelInfo.Count + 1;
                        int pictureIdx = workbook.AddPicture(picBytes, NPOI.SS.UserModel.PictureType.PNG);  //添加图片

                        HSSFPatriarch patriarch = (HSSFPatriarch)sheet.CreateDrawingPatriarch();

                        HSSFClientAnchor anchor = new HSSFClientAnchor(0, 0, 0, 240, col1, row1, col1 + 1, row1 + 1);

                        //图片位置，图片左上角为（col, row）
                        HSSFPicture pict = (HSSFPicture)patriarch.CreatePicture(anchor, pictureIdx);
                        pict.Resize(); //用图片原始大小来显示
                        picBytes = null;
                    }
                    workbook.Write(ms);
                    ms.Flush();
                    ms.Position = 0;
                }
            }
            catch (Exception ex)
            {
                ms = null;
            }
            return ms;
        }

        /// <param name="hssfworkbook">Excel操作类</param>
        /// <param name="fontname">字体名</param>
        /// <param name="fontcolor">字体颜色</param>
        /// <param name="fontsize">字体大小</param>
        /// <returns></returns>
        //public static IFont GetFontStyle(HSSFWorkbook hssfworkbook, string fontfamily, HSSFColor fontcolor, int fontsize)
        //{
        //    IFont font1 = hssfworkbook.CreateFont();
        //    if (string.IsNullOrEmpty(fontfamily))
        //    {
        //        font1.FontName = fontfamily;
        //    }
        //    if (fontcolor != null)
        //    {
        //        font1.Color = fontcolor.Indexed;
        //    }
        //    font1.IsItalic = true;
        //    font1.FontHeightInPoints = (short)fontsize;
        //    return font1;
        //}

        /// <param name="hssfworkbook">Excel操作类</param>
        /// <param name="font">单元格字体</param>
        /// <param name="fillForegroundColor">图案的颜色</param>
        /// <param name="fillPattern">图案样式</param>
        /// <param name="fillBackgroundColor">单元格背景</param>
        /// <param name="ha">垂直对齐方式</param>
        /// <param name="va">垂直对齐方式</param>
        /// <returns></returns>
        //public static ICellStyle GetCellStyle(HSSFWorkbook hssfworkbook, IFont font, NPOI.HSSF.Util.HSSFColor fillForegroundColor, FillPattern fillPattern, HSSFColor fillBackgroundColor, HorizontalAlignment ha, VerticalAlignment va)
        //{
        //    ICellStyle cellstyle = hssfworkbook.CreateCellStyle();
        //    cellstyle.FillPattern = fillPattern;
        //    cellstyle.Alignment = ha;
        //    cellstyle.VerticalAlignment = va;
        //    if (fillForegroundColor != null)
        //    {
        //        cellstyle.FillForegroundColor = fillForegroundColor.Indexed;
        //    }
        //    if (fillBackgroundColor != null)
        //    {
        //        cellstyle.FillBackgroundColor = fillBackgroundColor.Indexed;
        //    }
        //    if (font != null)
        //    {
        //        cellstyle.SetFont(font);
        //    }
        //    //有边框
        //    cellstyle.BorderBottom = BorderStyle.Thin;
        //    cellstyle.BorderLeft = BorderStyle.Thin;
        //    cellstyle.BorderRight = BorderStyle.Thin;
        //    cellstyle.BorderTop = BorderStyle.Thin;
        //    return cellstyle;
        //}


        /// <param name="sheet">要合并单元格所在的sheet</param>
        /// <param name="rowstart">开始行的索引</param>
        /// <param name="rowend">结束行的索引</param>
        /// <param name="colstart">开始列的索引</param>
        /// <param name="colend">结束列的索引</param>
        public static void SetCellRangeAddress(ISheet sheet, int rowstart, int rowend, int colstart, int colend)
        {
            CellRangeAddress cellRangeAddress = new CellRangeAddress(rowstart, rowend, colstart, colend);
            sheet.AddMergedRegion(cellRangeAddress);
        }
    }
}