3.3 用NPOI操作EXCEL－－生成一张工资单

   这一节，我们将综合NPOI的常用功能（包括创建和填充单元格、合并单元格、设置单元格样式和利用公式），做一个工资单的实例。先看创建标题行的代码：

//写标题文本
HSSFSheet sheet1 = hssfworkbook.CreateSheet("Sheet1");
HSSFCell cellTitle = sheet1.CreateRow(0).CreateCell(0);
cellTitle.SetCellValue("XXX公司2009年10月工资单");

//设置标题行样式
HSSFCellStyle style = hssfworkbook.CreateCellStyle();
style.Alignment = HSSFCellStyle.ALIGN_CENTER;
HSSFFont font = hssfworkbook.CreateFont();
font.FontHeight = 20 * 20;
style.SetFont(font);

cellTitle.CellStyle = style;

//合并标题行
sheet1.AddMergedRegion(new Region(0, 0, 1, 6));

其中用到了我们前面讲的设置单元格样式和合并单元格等内容。接下来我们循环创建公司每个员工的工资单：

DataTable dt=GetData();
HSSFRow row;
HSSFCell cell;
HSSFCellStyle celStyle=getCellStyle();

HSSFPatriarch patriarch = sheet1.CreateDrawingPatriarch();
HSSFClientAnchor anchor;
HSSFSimpleShape line;
int rowIndex;
for (int i = 0; i < dt.Rows.Count; i++)
{
    //表头数据
    rowIndex = 3 * (i + 1);
    row = sheet1.CreateRow(rowIndex);

    cell = row.CreateCell(0);
    cell.SetCellValue("姓名");
    cell.CellStyle = celStyle;

    cell = row.CreateCell(1);
    cell.SetCellValue("基本工资");
    cell.CellStyle = celStyle;

    cell = row.CreateCell(2);
    cell.SetCellValue("住房公积金");
    cell.CellStyle = celStyle;

    cell = row.CreateCell(3);
    cell.SetCellValue("绩效奖金");
    cell.CellStyle = celStyle;

    cell = row.CreateCell(4);
    cell.SetCellValue("社保扣款");
    cell.CellStyle = celStyle;

    cell = row.CreateCell(5);
    cell.SetCellValue("代扣个税");
    cell.CellStyle = celStyle;

    cell = row.CreateCell(6);
    cell.SetCellValue("实发工资");
    cell.CellStyle = celStyle;


    DataRow dr = dt.Rows[i];
    //设置值和计算公式
    row = sheet1.CreateRow(rowIndex + 1);
    cell = row.CreateCell(0);
    cell.SetCellValue(dr["FName"].ToString());
    cell.CellStyle = celStyle;

    cell = row.CreateCell(1);
    cell.SetCellValue((double)dr["FBasicSalary"]);
    cell.CellStyle = celStyle;

    cell = row.CreateCell(2);
    cell.SetCellValue((double)dr["FAccumulationFund"]);
    cell.CellStyle = celStyle;

    cell = row.CreateCell(3);
    cell.SetCellValue((double)dr["FBonus"]);
    cell.CellStyle = celStyle;

    cell = row.CreateCell(4);
    cell.SetCellFormula(String.Format("$B{0}*0.08",rowIndex+2));
    cell.CellStyle = celStyle;

    cell = row.CreateCell(5);
    cell.SetCellFormula(String.Format("SUM($B{0}:$D{0})*0.1",rowIndex+2));
    cell.CellStyle = celStyle;

    cell = row.CreateCell(6);
    cell.SetCellFormula(String.Format("SUM($B{0}:$D{0})-SUM($E{0}:$F{0})",rowIndex+2));     cell.CellStyle = celStyle;     //绘制分隔线     sheet1.AddMergedRegion(new Region(rowIndex+2, 0, rowIndex+2, 6));     anchor = new HSSFClientAnchor(0, 125, 1023, 125, 0, rowIndex + 2, 6, rowIndex + 2);     line = patriarch.CreateSimpleShape(anchor);     line.ShapeType = HSSFSimpleShape.OBJECT_TYPE_LINE;     line.LineStyle = HSSFShape.LINESTYLE_DASHGEL; }

其中为了文件打印为单元格增加了黑色边框的样式（如果不设置边框样式，打印出来后是没有边框的）。另外，注意循环过程中excel中的行号随数据源中的行号变化处理。完整代码如下：  

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using NPOI.HSSF.UserModel;
using System.IO;
using NPOI.HPSF;
using NPOI.HSSF.Util;
using System.Data;

namespace Payroll
{
    public class Program
    {
        static HSSFWorkbook hssfworkbook;

        static void Main(string[] args)
        {
            InitializeWorkbook();

            //写标题文本
            HSSFSheet sheet1 = hssfworkbook.CreateSheet("Sheet1");
            HSSFCell cellTitle = sheet1.CreateRow(0).CreateCell(0);
            cellTitle.SetCellValue("XXX公司2009年10月工资单");

            //设置标题行样式
            HSSFCellStyle style = hssfworkbook.CreateCellStyle();
            style.Alignment = HSSFCellStyle.ALIGN_CENTER;
            HSSFFont font = hssfworkbook.CreateFont();
            font.FontHeight = 20 * 20;
            style.SetFont(font);

            cellTitle.CellStyle = style;

            //合并标题行
            sheet1.AddMergedRegion(new Region(0, 0, 1, 6));

            DataTable dt=GetData();
            HSSFRow row;
            HSSFCell cell;
            HSSFCellStyle celStyle=getCellStyle();

            HSSFPatriarch patriarch = sheet1.CreateDrawingPatriarch();
            HSSFClientAnchor anchor;
            HSSFSimpleShape line;
            int rowIndex;
            for (int i = 0; i < dt.Rows.Count; i++)
            {
                //表头数据
                rowIndex = 3 * (i + 1);
                row = sheet1.CreateRow(rowIndex);

                cell = row.CreateCell(0);
                cell.SetCellValue("姓名");
                cell.CellStyle = celStyle;

                cell = row.CreateCell(1);
                cell.SetCellValue("基本工资");
                cell.CellStyle = celStyle;

                cell = row.CreateCell(2);
                cell.SetCellValue("住房公积金");
                cell.CellStyle = celStyle;

                cell = row.CreateCell(3);
                cell.SetCellValue("绩效奖金");
                cell.CellStyle = celStyle;

                cell = row.CreateCell(4);
                cell.SetCellValue("社保扣款");
                cell.CellStyle = celStyle;

                cell = row.CreateCell(5);
                cell.SetCellValue("代扣个税");
                cell.CellStyle = celStyle;

                cell = row.CreateCell(6);
                cell.SetCellValue("实发工资");
                cell.CellStyle = celStyle;


                DataRow dr = dt.Rows[i];
                //设置值和计算公式
                row = sheet1.CreateRow(rowIndex + 1);                 cell = row.CreateCell(0);                 cell.SetCellValue(dr["FName"].ToString());                 cell.CellStyle = celStyle;                 cell = row.CreateCell(1);                 cell.SetCellValue((double)dr["FBasicSalary"]);                 cell.CellStyle = celStyle;                 cell = row.CreateCell(2);                 cell.SetCellValue((double)dr["FAccumulationFund"]);                 cell.CellStyle = celStyle;                 cell = row.CreateCell(3);                 cell.SetCellValue((double)dr["FBonus"]);                 cell.CellStyle = celStyle;                 cell = row.CreateCell(4);                 cell.SetCellFormula(String.Format("$B{0}*0.08",rowIndex+2));                 cell.CellStyle = celStyle;                 cell = row.CreateCell(5);                 cell.SetCellFormula(String.Format("SUM($B{0}:$D{0})*0.1",rowIndex+2));                 cell.CellStyle = celStyle;                 cell = row.CreateCell(6);                 cell.SetCellFormula(String.Format("SUM($B{0}:$D{0})-SUM($E{0}:$F{0})",rowIndex+2));                 cell.CellStyle = celStyle;                 //绘制分隔线                 sheet1.AddMergedRegion(new Region(rowIndex+2, 0, rowIndex+2, 6));                 anchor = new HSSFClientAnchor(0, 125, 1023, 125, 0, rowIndex + 2, 6, rowIndex + 2);                 line = patriarch.CreateSimpleShape(anchor);                 line.ShapeType = HSSFSimpleShape.OBJECT_TYPE_LINE;                 line.LineStyle = HSSFShape.LINESTYLE_DASHGEL;             }             WriteToFile();         }         static DataTable GetData()         {             DataTable dt = new DataTable();             dt.Columns.Add("FName",typeof(System.String));             dt.Columns.Add("FBasicSalary",typeof(System.Double));             dt.Columns.Add("FAccumulationFund", typeof(System.Double));             dt.Columns.Add("FBonus", typeof(System.Double));             dt.Rows.Add("令狐冲", 6000, 1000, 2000);             dt.Rows.Add("任盈盈", 7000, 1000, 2500);             dt.Rows.Add("林平之", 5000, 1000, 1500);             dt.Rows.Add("岳灵珊", 4000, 1000, 900);             dt.Rows.Add("任我行", 4000, 1000, 800);             dt.Rows.Add("风清扬", 9000, 5000, 3000);             return dt;         }                  static HSSFCellStyle getCellStyle()         {             HSSFCellStyle cellStyle = hssfworkbook.CreateCellStyle();             cellStyle.BorderBottom = HSSFCellStyle.BORDER_THIN;             cellStyle.BorderLeft = HSSFCellStyle.BORDER_THIN;             cellStyle.BorderRight = HSSFCellStyle.BORDER_THIN;             cellStyle.BorderTop = HSSFCellStyle.BORDER_THIN;             return cellStyle;         }         static void WriteToFile()         {             //Write the stream data of workbook to the root directory             FileStream file = new FileStream(@"test.xls", FileMode.Create);             hssfworkbook.Write(file);             file.Close();         }         static void InitializeWorkbook()         {             hssfworkbook = new HSSFWorkbook();             //create a entry of DocumentSummaryInformation             DocumentSummaryInformation dsi = PropertySetFactory.CreateDocumentSummaryInformation();             dsi.Company = "NPOI Team";             hssfworkbook.DocumentSummaryInformation = dsi;             //create a entry of SummaryInformation             SummaryInformation si = PropertySetFactory.CreateSummaryInformation();             si.Subject = "NPOI SDK Example";             hssfworkbook.SummaryInformation = si;         }     } }

生成的Excel文件样式如下：

 学习教程：http://www.cnblogs.com/atao/archive/2009/10/13/1582832.html