NPOI2.1.1简单使用

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在.net中导出数据到Excel其中使用的比较多的是NPOI类库，但是NPOI版本存在比较多，并且改变较大，官方提供的代码不太完备，所以在这里简单记录一下。

一、使用的类库包：

using NPOI.SS.UserModel;
using NPOI.HSSF.UserModel;

HSSFWorkbook hssfworkbook = new HSSFWorkbook();
ISheet sheet = hssfworkbook.CreateSheet("Sheet1");
hssfworkbook.CreateSheet("Sheet2");
hssfworkbook.CreateSheet("Sheet3");

下面的是一个简单的例子，设置工作表的标题字体，并且合并第一行，前5列

            //Title
            IRow row = sheet.CreateRow(0);    //创建行对象
            ICell cell = row.CreateCell(0);   //创建单元格对象
            cell.SetCellValue(title);         //设置单元格内容

            // 设置单元格字体
            ICellStyle style = hssfworkbook.CreateCellStyle();
            style.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
            IFont font = hssfworkbook.CreateFont();
            font.FontHeight = 20 * 20;
            style.SetFont(font);
            cell.CellStyle = style;

            // 合并第0列到第4列的内容
            sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0,0,0,4));

            FileStream</span> file = new FileStream(filePath, FileMode.Create);
            hssfworkbook.Write(file);
            file.Close();

        /// <summary>
        /// 把DataGridView的内容导出到excel文件
        /// </summary>
        /// <param name="dgv">DataGridView对象</param>
        /// <param name="title">设置的标题</param>
        /// <param name="filePath">保存的文件路径</param>
        /// <returns></returns>
        public static int SaveToExcel(DataGridView dgv, string title, string filePath)
        {
            if (dgv==null ||(dgv.Rows.Count == 0 && dgv.Columns.Count == 0))
                return 1;
            HSSFWorkbook hssfworkbook = new HSSFWorkbook();
            ISheet sheet = hssfworkbook.CreateSheet("Sheet1");
            hssfworkbook.CreateSheet("Sheet2");
            hssfworkbook.CreateSheet("Sheet3");

            //Title
            IRow row = sheet.CreateRow(0);
            ICell cell = row.CreateCell(0);
            cell.SetCellValue(title);
            ICellStyle style = hssfworkbook.CreateCellStyle();
            style.Alignment = NPOI.SS.UserModel.HorizontalAlignment.Center;
            IFont font = hssfworkbook.CreateFont();
            font.FontHeight = 20 * 20;
            style.SetFont(font);
            cell.CellStyle = style;
            sheet.AddMergedRegion(new NPOI.SS.Util.CellRangeAddress(0,0,0,dgv.Columns.Count-1));
            
            //Header
            int r, c;
            row = sheet.CreateRow(1);
            for (c = 0; c < dgv.Columns.Count; c++)
            {
                row.CreateCell(c).SetCellValue(dgv.Columns[c].HeaderText);
            }

            // content
            for (r = 0; r < dgv.Rows.Count; r++)
            {
                row = sheet.CreateRow(r+2);
                for (c = 0; c < dgv.Columns.Count; c++)
                {
                    cell = row.CreateCell(c);
                    if (dgv[c,r].Value !=null)
                        cell.SetCellValue(dgv[c,r].Value.ToString());
                }
            }
            r = 0;
            FileStream file=null;
            try
            {
                file = new FileStream(filePath, FileMode.Create);
                hssfworkbook.Write(file);
            }
            catch (Exception ex)
            {
                MessageBox.Show(ex.Message);
                r = 1;
            }
            finally
            {
                if (file !=null)
                    file.Close();
            }
            return r;
        }

NPOI2.1.1简单使用

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原文地址：http://blog.csdn.net/yao_guet/article/details/45277687