NPOI 导出 Excel

using NPOI.HPSF;
using NPOI.HSSF.UserModel;
using NPOI.SS.UserModel;
using NPOI.XSSF.UserModel;
using System;
using System.Data;
using System.IO;
using System.Text;
using System.Web;

namespace Utils
{
    public class NewExcel2Helper
    {
        #region Excel2003导出
        /// <summary>
        /// Excel导出方法 ExportByWeb()
        /// </summary>
        /// <param name="dtSource">DataTable数据源</param>
        /// <param name="strHeaderText">Excel表头文本（例如：车辆列表）</param>
        /// <param name="strFileName">Excel文件名（例如：车辆列表.xls）</param>
        public static void ExportByWeb2003(System.Data.DataTable dtSource, string strHeaderText, string strFileName)
        {
            HttpContext curContext = HttpContext.Current;
            // 设置编码和附件格式
            curContext.Response.ContentType = "application/ms-excel";
            curContext.Response.ContentEncoding = Encoding.UTF8;
            curContext.Response.Charset = "";
            curContext.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));
            //调用导出具体方法Export()
            curContext.Response.BinaryWrite(Export2003(dtSource, strHeaderText).GetBuffer());
            curContext.Response.End();
        }


        /// <summary>
        /// DataTable导出到Excel的MemoryStream Export()
        /// </summary>
        /// <param name="dtSource">DataTable数据源</param>
        /// <param name="strHeaderText">Excel表头文本（例如：车辆列表）</param>
        public static MemoryStream Export2003(System.Data.DataTable dtSource, string strHeaderText)
        {
            HSSFWorkbook workbook = new HSSFWorkbook();
            ISheet sheet = workbook.CreateSheet();
            sheet.DisplayGridlines = false;//隐藏网格线

            #region 右击文件 属性信息

            {
                DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();
                dsi.Company = "DPD";
                workbook.DocumentSummaryInformation = dsi;

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

            #endregion 右击文件 属性信息

            ICellStyle dateStyle = workbook.CreateCellStyle();
            IDataFormat format = workbook.CreateDataFormat();

            //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 + 2;
            }
            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 + 2;
                    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 列头及样式

                    {
                        IRow headerRow = sheet.CreateRow(0);
                        headerRow.HeightInPoints = 20;//行高
                        ICellStyle headStyle = workbook.CreateCellStyle();
                        headStyle.Alignment = HorizontalAlignment.Center; // ------------------
                        NPOI.SS.UserModel.IFont font = workbook.CreateFont();
                        font.FontHeightInPoints = 10;
                        font.Boldweight = 700;
                        headStyle.SetFont(font);
                        headStyle.FillPattern = NPOI.SS.UserModel.FillPattern.SolidForeground;
                        headStyle.FillForegroundColor = 44;
                        headStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
                        headStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
                        headStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
                        headStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;

                        foreach (DataColumn column in dtSource.Columns)
                        {
                            headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                            headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

                            //设置列宽
                            //AutoSizeColumns(sheet);
                            //sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
                            //设置列宽

                            if (arrColWidth[column.Ordinal] > 255)
                            {
                                arrColWidth[column.Ordinal] = 254;
                            }
                            else
                            {
                                sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
                            }
                        }
                    }

                    #endregion 列头及样式

                    rowIndex = 1;
                }

                #endregion 新建表，填充表头，填充列头，样式

                #region 填充内容

                IRow dataRow = sheet.CreateRow(rowIndex);

                //dataRow.HeightInPoints = 20;//行高

                foreach (DataColumn column in dtSource.Columns)
                {
                    ICell newCell = dataRow.CreateCell(column.Ordinal);
                    string drValue = row[column].ToString();
                    dateStyle.Alignment = HorizontalAlignment.Center;
                    dateStyle.Alignment = HorizontalAlignment.Left;
                    dateStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;//下边框为细线边框
                    dateStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;//左边框
                    dateStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;//上边框
                    dateStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;//右边框
                    dateStyle.WrapText = true;//设置换行这个要先设置
                    newCell.CellStyle = dateStyle;//格式化显示
                    switch (column.DataType.ToString())
                    {
                        case "System.String"://字符串类型
                            newCell.SetCellValue(drValue);
                            break;

                        case "System.DateTime"://日期类型
                                               // newCell.SetCellValue(DateTime.Parse(drValue).ToString("yyyy-MM-dd"));
                            newCell.SetCellValue(string.IsNullOrEmpty(drValue) ? "" : DateTime.Parse(drValue).ToString("yyyy-MM-dd HH:mm:ss:ffff"));
                            break;

                        case "System.Boolean"://布尔型
                            bool boolV = false;
                            bool.TryParse(drValue, out boolV);
                            newCell.SetCellValue(boolV);
                            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);
                            break;

                        case "System.Decimal"://浮点型
                        case "System.Double":
                            double doubV = 0;
                            double.TryParse(drValue, out doubV);
                            newCell.SetCellValue(doubV);
                            break;

                        case "System.DBNull"://空值处理
                            newCell.SetCellValue("");
                            break;

                        default:
                            newCell.SetCellValue("");
                            break;
                    }
                }

                #endregion 填充内容

                rowIndex++;
            }
            for (int columnNum = 0; columnNum <= dtSource.Columns.Count; columnNum++)
            {
                sheet.AutoSizeColumn((short)columnNum);
            }

            using (MemoryStream ms = new MemoryStream())
            {
                workbook.Write(ms);
                ms.Flush();
                ms.Position = 0;
                return ms;
            }
        }

        #endregion

        #region Excel2007导出
        /// <summary>
        /// Excel导出方法 ExportByWeb()
        /// </summary>
        /// <param name="dtSource">DataTable数据源</param>
        /// <param name="strHeaderText">Excel表头文本（例如：车辆列表）</param>
        /// <param name="strFileName">Excel文件名（例如：车辆列表.xls）</param>
        public static void ExportByWeb2007(System.Data.DataTable dtSource, string strHeaderText, string strFileName)
        {
            HttpContext curContext = HttpContext.Current;
            // 设置编码和附件格式
            curContext.Response.ContentType = "application/ms-excel";
            curContext.Response.ContentEncoding = Encoding.UTF8;
            curContext.Response.Charset = "";
            curContext.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8));
            //调用导出具体方法Export()
            curContext.Response.BinaryWrite(Export2007(dtSource, strHeaderText).GetBuffer());
            curContext.Response.End();
        }


        /// <summary>
        /// DataTable导出到Excel的MemoryStream Export()
        /// </summary>
        /// <param name="dtSource">DataTable数据源</param>
        /// <param name="strHeaderText">Excel表头文本（例如：车辆列表）</param>
        public static MemoryStream Export2007(System.Data.DataTable dtSource, string strHeaderText)
        {
            XSSFWorkbook workbook = new XSSFWorkbook();
            ISheet sheet = workbook.CreateSheet();
            sheet.DisplayGridlines = false;//隐藏网格线


            ICellStyle dateStyle = workbook.CreateCellStyle();
            IDataFormat format = workbook.CreateDataFormat();

            //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 + 2;
            }
            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 + 2;
                    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 == 1048575 || rowIndex == 0)
                {
                    if (rowIndex != 0)
                    {
                        sheet = workbook.CreateSheet();
                    }

                    #region 列头及样式

                    {
                        IRow headerRow = sheet.CreateRow(0);
                        headerRow.HeightInPoints = 20;//行高
                        ICellStyle headStyle = workbook.CreateCellStyle();
                        headStyle.Alignment = HorizontalAlignment.Center; // ------------------
                        NPOI.SS.UserModel.IFont font = workbook.CreateFont();
                        font.FontHeightInPoints = 10;
                        font.Boldweight = 700;
                        headStyle.SetFont(font);
                        headStyle.FillPattern = NPOI.SS.UserModel.FillPattern.SolidForeground;
                        headStyle.FillForegroundColor = 44;
                        headStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
                        headStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
                        headStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
                        headStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;

                        foreach (DataColumn column in dtSource.Columns)
                        {
                            headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                            headerRow.GetCell(column.Ordinal).CellStyle = headStyle;

                            //设置列宽
                            //AutoSizeColumns(sheet);
                            //sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
                            //设置列宽

                            if (arrColWidth[column.Ordinal] > 255)
                            {
                                arrColWidth[column.Ordinal] = 254;
                            }
                            else
                            {
                                sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
                            }
                        }
                    }

                    #endregion 列头及样式

                    rowIndex = 1;
                }

                #endregion 新建表，填充表头，填充列头，样式

                #region 填充内容

                IRow dataRow = sheet.CreateRow(rowIndex);

                //dataRow.HeightInPoints = 20;//行高

                foreach (DataColumn column in dtSource.Columns)
                {
                    ICell newCell = dataRow.CreateCell(column.Ordinal);
                    string drValue = row[column].ToString();
                    dateStyle.Alignment = HorizontalAlignment.Center;
                    dateStyle.Alignment = HorizontalAlignment.Left;
                    dateStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;//下边框为细线边框
                    dateStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;//左边框
                    dateStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;//上边框
                    dateStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;//右边框
                    dateStyle.WrapText = true;//设置换行这个要先设置
                    newCell.CellStyle = dateStyle;//格式化显示
                    switch (column.DataType.ToString())
                    {
                        case "System.String"://字符串类型
                            newCell.SetCellValue(drValue);
                            break;

                        case "System.DateTime"://日期类型
                                               // newCell.SetCellValue(DateTime.Parse(drValue).ToString("yyyy-MM-dd"));
                            newCell.SetCellValue(string.IsNullOrEmpty(drValue) ? "" : DateTime.Parse(drValue).ToString("yyyy-MM-dd HH:mm:ss:ffff"));
                            break;

                        case "System.Boolean"://布尔型
                            bool boolV = false;
                            bool.TryParse(drValue, out boolV);
                            newCell.SetCellValue(boolV);
                            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);
                            break;

                        case "System.Decimal"://浮点型
                        case "System.Double":
                            double doubV = 0;
                            double.TryParse(drValue, out doubV);
                            newCell.SetCellValue(doubV);
                            break;

                        case "System.DBNull"://空值处理
                            newCell.SetCellValue("");
                            break;

                        default:
                            newCell.SetCellValue("");
                            break;
                    }
                }

                #endregion 填充内容

                rowIndex++;
            }
            for (int columnNum = 0; columnNum <= dtSource.Columns.Count; columnNum++)
            {
                sheet.AutoSizeColumn((short)columnNum);
            }

            using (MemoryStream ms = new MemoryStream())
            {
                workbook.Write(ms);
                ms.Flush();
              
                //ms.Position = 0;
                return ms;
            }
        }

        #endregion
    }
}

 

   #region  XSSFWorkbook-单元格长度调整

        /// <summary>
        /// Excel导出方法 ExportByWeb()
        /// </summary>
        /// <param name="dtSource">DataTable数据源</param>
        /// <param name="strHeaderText">Excel表头文本（例如：车辆列表）</param>
        /// <param name="strFileName">Excel文件名（例如：车辆列表.xls）</param>
        public static void ExportByWebXSSF(System.Data.DataTable dtSource, string strHeaderText, string strFileName)
        {
            strFileName = strFileName.Replace(".xls", "").Replace(".xlsx", "");

            HttpContext curContext = HttpContext.Current;
            // 设置编码和附件格式
            curContext.Response.ContentType = "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet";
            curContext.Response.ContentEncoding = Encoding.UTF8;
            curContext.Response.Charset = "";
            curContext.Response.AppendHeader("Content-Disposition", "attachment;filename=" + HttpUtility.UrlEncode(strFileName, Encoding.UTF8) + ".xlsx");
            //调用导出具体方法Export()
            curContext.Response.BinaryWrite(ExportXSSF(dtSource).GetBuffer());
            curContext.Response.End();
        }


        /// <summary>
        /// DataTable导出到Excel的MemoryStream Export()
        /// </summary>
        /// <param name="dtSource">DataTable数据源</param>
        public static MemoryStream ExportXSSF(System.Data.DataTable dtSource)
        {
            XSSFWorkbook workbook = new XSSFWorkbook();
            ISheet sheet = workbook.CreateSheet();
            sheet.DisplayGridlines = false;//隐藏网格线


            ICellStyle headStyle = workbook.CreateCellStyle();
            headStyle.Alignment = HorizontalAlignment.Center; // ------------------
            NPOI.SS.UserModel.IFont font = workbook.CreateFont();
            font.FontHeightInPoints = 10;
            font.Boldweight = 700;
            headStyle.SetFont(font);
            headStyle.FillPattern = NPOI.SS.UserModel.FillPattern.SolidForeground;
            headStyle.FillForegroundColor = 44;
            headStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;
            headStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;
            headStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;
            headStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;

            ICellStyle dateStyle = workbook.CreateCellStyle();
            dateStyle.Alignment = HorizontalAlignment.Center;
            dateStyle.Alignment = HorizontalAlignment.Left;
            dateStyle.BorderBottom = NPOI.SS.UserModel.BorderStyle.Thin;//下边框为细线边框
            dateStyle.BorderLeft = NPOI.SS.UserModel.BorderStyle.Thin;//左边框
            dateStyle.BorderRight = NPOI.SS.UserModel.BorderStyle.Thin;//上边框
            dateStyle.BorderTop = NPOI.SS.UserModel.BorderStyle.Thin;//右边框
            dateStyle.WrapText = true;//设置换行这个要先设置

            //IDataFormat format = workbook.CreateDataFormat();

            //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 + 2;
            }


            int rowIndex = 0;
            foreach (DataRow row in dtSource.Rows)
            {
                #region 新建表，填充表头，填充列头，样式
                //100W分页
                if (rowIndex == 1000001 || rowIndex == 0)
                {
                    if (rowIndex != 0)
                    {
                        //单元格长度调整
                        foreach (DataColumn column in dtSource.Columns)
                        {
                            sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
                        }
                        sheet = workbook.CreateSheet();
                    }

                    IRow headerRow = sheet.CreateRow(0);
                    headerRow.HeightInPoints = 20;//行高
                    foreach (DataColumn column in dtSource.Columns)
                    {
                        headerRow.CreateCell(column.Ordinal).SetCellValue(column.ColumnName);
                        headerRow.GetCell(column.Ordinal).CellStyle = headStyle;//格式化显示
                    }

                    rowIndex = 1;
                }

                #endregion 新建表，填充表头，填充列头，样式

                #region 填充内容

                IRow dataRow = sheet.CreateRow(rowIndex);

                foreach (DataColumn column in dtSource.Columns)
                {
                    string drValue = row[column].ToString();

                    //验证长度
                    int intTemp = Encoding.GetEncoding(936).GetBytes(drValue).Length + 2;
                    if (intTemp > arrColWidth[column.Ordinal])
                    {
                        arrColWidth[column.Ordinal] = intTemp;
                    }


                    ICell newCell = dataRow.CreateCell(column.Ordinal);
                    newCell.CellStyle = dateStyle;//格式化显示

                    switch (column.DataType.ToString())
                    {
                        case "System.String"://字符串类型
                            newCell.SetCellValue(drValue);
                            break;

                        case "System.DateTime"://日期类型
                            newCell.SetCellValue(string.IsNullOrEmpty(drValue) ? "" : DateTime.Parse(drValue).ToString("yyyy-MM-dd HH:mm:ss"));
                            break;

                        case "System.Boolean"://布尔型
                            bool boolV = false;
                            bool.TryParse(drValue, out boolV);
                            newCell.SetCellValue(boolV);
                            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);
                            break;

                        case "System.Decimal"://浮点型
                        case "System.Double":
                            double doubV = 0;
                            double.TryParse(drValue, out doubV);
                            newCell.SetCellValue(doubV);
                            break;

                        case "System.DBNull"://空值处理
                            newCell.SetCellValue("");
                            break;

                        default:
                            newCell.SetCellValue("");
                            break;
                    }
                }

                #endregion 填充内容

                rowIndex++;
            }

            //单元格长度调整
            foreach (DataColumn column in dtSource.Columns)
            {
                sheet.SetColumnWidth(column.Ordinal, (arrColWidth[column.Ordinal] + 1) * 256);
            }

            using (MemoryStream ms = new MemoryStream())
            {
                workbook.Write(ms);
                ms.Flush();
                //ms.Position = 0;
                return ms;
            }
        }

        #endregion