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：