NPOI_winfrom导出Excel表格（一）（合并单元格、规定范围加外边框、存储路径弹框选择）

1.导出

   private void btn_print_Click(object sender, EventArgs e)
         {
                 DataTable dtNew = new DataTable();

                 dtNew.Columns.Add(new DataColumn("commodity_name", typeof(object)));
                 dtNew.Columns.Add(new DataColumn("specifications", typeof(object)));
                 dtNew.Columns.Add(new DataColumn("unit", typeof(object)));
                 dtNew.Columns.Add(new DataColumn("number", typeof(object)));
                 dtNew.Columns.Add(new DataColumn("price", typeof(object)));
                 dtNew.Columns.Add(new DataColumn("money", typeof(object)));
                 dtNew.Columns.Add(new DataColumn("settlement", typeof(object)));

                 for (int i = ; i < dgv.Rows.Count; i++)
                 {
                     DataRow dr = dtNew.NewRow();
                     dr["commodity_name"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                     dr["specifications"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                     dr["unit"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                     dr["number"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                     dr["price"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                     dr["money"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                     dr["settlement"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");

                     dtNew.Rows.Add(dr);
                 }
                 dgv2.DataSource = dtNew;

                 string xlsxName = "其他产品采购单_" + DateTime.Now.ToString("yyyyMMddHHmm") + ".xls";  //保存的Excel文件名
                 TableToExcelForXLSX(dtNew, xlsxName);  //传入带出数据及文件名
             }

  private void TableToExcelForXLSX(System.Data.DataTable dt, string output)
         {
             FileStream file = new FileStream(output, FileMode.OpenOrCreate, FileAccess.ReadWrite);
             try
             {
                 HSSFWorkbook workbook = new HSSFWorkbook();  //XSSFWorkbook :用于表示高及低层次excel文件格式的类，实现workbook接口。

                 ISheet sheet = workbook.CreateSheet("sheet");      //ISheet:是一个工作表的高级表示，Row:行；Cell:单元格
                 IRow row = null;
//第一行
                 row = sheet.CreateRow();//在工作表中添加一行
                 ICell cell = row.CreateCell();//在行中添加一列
                 cell.SetCellValue("商品采购入库单");//设置列的内容
                 setCellStyle(workbook, cell);
                 mergeCell(sheet, , , , );   //合并单元格

                 ICellStyle style = workbook.CreateCellStyle();
 
//第二行
                 row = sheet.CreateRow();
                 row.CreateCell();
                 sheet.GetRow().GetCell().SetCellValue("供货单位：");

                 row.CreateCell();
                 sheet.GetRow().GetCell().SetCellValue(txt_unitname.Text);

                 row.CreateCell();
                 sheet.GetRow().GetCell().SetCellValue((Convert.ToDateTime(dp_datetime.Text)).ToString("yyyy年MM月dd日"));
                  
//第三行

                 row = sheet.CreateRow();                //循环添加表头
                 for (int i = ; i < dgv2.ColumnCount; i++)
                 {
                     row.CreateCell(i);
                     sheet.GetRow().GetCell(i).SetCellValue(dgv2.Columns[i].HeaderText);
 //边框
                     style.BorderBottom = NPOI.SS.UserModel.BorderStyle.THIN;
                     style.BorderLeft = NPOI.SS.UserModel.BorderStyle.THIN;
                     style.BorderRight = NPOI.SS.UserModel.BorderStyle.THIN;
                     style.BorderTop = NPOI.SS.UserModel.BorderStyle.THIN;
                     style.BottomBorderColor = HSSFColor.BLACK.index;
                     style.LeftBorderColor = HSSFColor.BLACK.index;
                     style.RightBorderColor = HSSFColor.BLACK.index;
                     style.TopBorderColor = HSSFColor.BLACK.index;
                     row.GetCell(i).CellStyle = style;  //规定单元格加边框
                 }

                 for (int i = ; i <= dgv2.Rows.Count; i++)
                 {
                     row = sheet.CreateRow(i + );
                     for (int j = ; j < dgv2.ColumnCount; j++)
                     {
                         row.CreateCell(j);
                         string str = dgv2.Rows[i - ].Cells[j].Value.ToString();
                         sheet.GetRow(i + ).GetCell(j).SetCellValue(str);
                         style.BorderBottom = NPOI.SS.UserModel.BorderStyle.THIN;
                         style.BorderLeft = NPOI.SS.UserModel.BorderStyle.THIN;
                         style.BorderRight = NPOI.SS.UserModel.BorderStyle.THIN;
                         style.BorderTop = NPOI.SS.UserModel.BorderStyle.THIN;
                         style.BottomBorderColor = HSSFColor.BLACK.index;
                         style.LeftBorderColor = HSSFColor.BLACK.index;
                         style.RightBorderColor = HSSFColor.BLACK.index;
                         style.TopBorderColor = HSSFColor.BLACK.index;
                         row.GetCell(j).CellStyle = style;
                     }
                 }
                 row = sheet.CreateRow(dgv.Rows.Count + );

                 row.CreateCell();
                 sheet.GetRow(dgv.Rows.Count + ).GetCell().SetCellValue("财务审核：");

                 row.CreateCell();
                 sheet.GetRow(dgv.Rows.Count + ).GetCell().SetCellValue(cb_auditing.Text);

                 row.CreateCell();
                 sheet.GetRow(dgv.Rows.Count + ).GetCell().SetCellValue("实物负责人：");

                 row.CreateCell();
                 sheet.GetRow(dgv.Rows.Count + ).GetCell().SetCellValue(dgv.Rows[].Cells[].Value.ToString());

                 row.CreateCell();
                 sheet.GetRow(dgv.Rows.Count + ).GetCell().SetCellValue("制单人：");

                 row.CreateCell();
                 sheet.GetRow(dgv.Rows.Count + ).GetCell().SetCellValue(dgv.Rows[].Cells[].Value.ToString());

              // 存储路径弹框选择
                 SaveFileDialog saveDialog = new SaveFileDialog();
                 saveDialog.DefaultExt = "xls";
                 saveDialog.Filter = "Excel文件|*.xls";
                 saveDialog.FileName = output;
                 saveDialog.ShowDialog();
                 output = saveDialog.FileName;
                 if (output.IndexOf(":") < ) return; //被点了取消
                 if (output != "")
                 {
                     try
                     {
                         file = File.OpenWrite(saveDialog.FileName);
                         workbook.Write(file);
                         //file.Close();
                         //MessageBox.Show("导出成功！");
                     }
                     catch (Exception ex)
                     {
                         MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
                     }

                 }
             }

             finally
             {
                 if (file != null)
                     file.Close();
                 GC.SuppressFinalize(this);
             }

         }

2.合并单元格、设置字体

   private void mergeCell(ISheet sheet, int firstRow, int lastRow, int firstCell, int lastCell)
         {
             sheet.AddMergedRegion(new CellRangeAddress(firstRow, lastRow, firstCell, lastCell));//2.0使用 2.0以下为Region
         }

   private void setCellStyle(HSSFWorkbook workbook, ICell cell)
         {
             HSSFCellStyle fCellStyle = (HSSFCellStyle)workbook.CreateCellStyle();
             HSSFFont ffont = (HSSFFont)workbook.CreateFont();
             ffont.FontHeight =  * ;
             ffont.FontName = "宋体";
             fCellStyle.SetFont(ffont);

             fCellStyle.VerticalAlignment = NPOI.SS.UserModel.VerticalAlignment.CENTER;//垂直对齐
             fCellStyle.Alignment = NPOI.SS.UserModel.HorizontalAlignment.CENTER;//水平对齐
             cell.CellStyle = fCellStyle;
         }

附加（ 使用Microsoft.Office.Interop.Excel 导出Excel表格）

  private void ExportExcels(string fileName, DataGridView myDGV)
        {
            string saveFileName = "";
            SaveFileDialog saveDialog = new SaveFileDialog();
            saveDialog.DefaultExt = "xls";
            saveDialog.Filter = "Excel文件|*.xls";
            saveDialog.FileName = fileName;
            saveDialog.ShowDialog();
            saveFileName = saveDialog.FileName;
            if (saveFileName.IndexOf(":") < ) return;被点了取消
            Microsoft.Office.Interop.Excel.Application xlApp = new Microsoft.Office.Interop.Excel.Application();
            if (xlApp == null)
            {
                MessageBox.Show("无法创建Excel对象，可能您的机子未安装Excel");
                return;
            }

            Microsoft.Office.Interop.Excel.Workbooks workbooks = xlApp.Workbooks;
            Microsoft.Office.Interop.Excel.Workbook workbook = workbooks.Add(Microsoft.Office.Interop.Excel.XlWBATemplate.xlWBATWorksheet);
            Microsoft.Office.Interop.Excel.Worksheet worksheet = (Microsoft.Office.Interop.Excel.Worksheet)workbook.Worksheets[];//取得sheet1

            DataTable dtNew = new DataTable();

            dtNew.Columns.Add(new DataColumn("id", typeof(object)));
            dtNew.Columns.Add(new DataColumn("datetime", typeof(object)));
            dtNew.Columns.Add(new DataColumn("purchase_unit", typeof(object)));
            dtNew.Columns.Add(new DataColumn("specifications", typeof(object)));
            dtNew.Columns.Add(new DataColumn("unit", typeof(object)));
            dtNew.Columns.Add(new DataColumn("number", typeof(object)));
            dtNew.Columns.Add(new DataColumn("price", typeof(object)));
            dtNew.Columns.Add(new DataColumn("money", typeof(object)));
            dtNew.Columns.Add(new DataColumn("payment", typeof(object)));
            dtNew.Columns.Add(new DataColumn("remain", typeof(object)));

            for (int i = ; i < dgv.Rows.Count; i++)
            {
                DataRow dr = dtNew.NewRow();

                dr["id"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                dr["datetime"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                dr["purchase_unit"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                dr["specifications"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                dr["unit"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                dr["number"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                dr["price"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                dr["money"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                dr["payment"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");
                dr["remain"] = Convert.ToString(dgv.Rows[i].Cells[].Value ?? "");

                dtNew.Rows.Add(dr);
            }
            dgv2.DataSource = dtNew;
            Excel.Range titleRange = worksheet.Range[worksheet.Cells[, ], worksheet.Cells[, ]];//选取单元格
            titleRange.Merge(true);//合并单元格
            titleRange.Value2 = "其它商品销售明细汇总表";设置单元格内文本
            titleRange.Font.Name = "宋体";//设置字体
            titleRange.Font.Size = ;//字体大小
            titleRange.Font.Bold = false;//加粗显示
            titleRange.HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;//水平居中
            titleRange.VerticalAlignment = Excel.XlVAlign.xlVAlignCenter;//垂直居中
            titleRange.Borders.LineStyle = Excel.XlLineStyle.xlContinuous;//设置边框
            titleRange.Borders.Weight = Excel.XlBorderWeight.xlThin;//边框常规粗细  

            Excel.Range title_unitname = worksheet.Range[worksheet.Cells[, ], worksheet.Cells[, ]];//选取单元格
            title_unitname.Merge(false);//合并单元格
            title_unitname.Value2 = "商品名称：";设置单元格内文本
            title_unitname.Font.Name = "宋体";//设置字体
            title_unitname.Font.Size = ;//字体大小  

            Excel.Range title_unitname2 = worksheet.Range[worksheet.Cells[, ], worksheet.Cells[, ]];//选取单元格
            title_unitname2.Merge(false);//合并单元格
            title_unitname2.Value2 = txt_commname.Text;设置单元格内文本
            title_unitname2.Font.Name = "宋体";//设置字体
            title_unitname2.Font.Size = ;//字体大小  

            Excel.Range title_datetime = worksheet.Range[worksheet.Cells[, ], worksheet.Cells[, ]];//选取单元格
            title_datetime.Merge(true);//合并单元格
            title_datetime.Value2 = (Convert.ToDateTime(dp_datetime1.Text)).ToString("yyyy年MM月dd日");设置单元格内文本
            title_datetime.Font.Name = "宋体";//设置字体
            title_datetime.Font.Size = ;//字体大小  

            Excel.Range title_z = worksheet.Range[worksheet.Cells[, ], worksheet.Cells[,]];//选取单元格
            title_z.Merge(true);//合并单元格
            title_z.Value2 = "至";设置单元格内文本
            title_z.Font.Name = "宋体";//设置字体
            title_z.Font.Size = ;//字体大小
            title_z.HorizontalAlignment = Excel.XlHAlign.xlHAlignCenter;//水平居中

            Excel.Range title_datetime2 = worksheet.Range[worksheet.Cells[, ], worksheet.Cells[,]];//选取单元格
            title_datetime2.Merge(true);//合并单元格
            title_datetime2.Value2 = (Convert.ToDateTime(dp_datetime2.Text)).ToString("yyyy年MM月dd日");设置单元格内文本
            title_datetime2.Font.Name = "宋体";//设置字体
            title_datetime2.Font.Size = ;//字体大小    

            for (int i = ; i < dgv2.ColumnCount; i++)
            {
               worksheet.Cells[, i + ] = dgv.Columns[i].HeaderText;
                Excel.Range title_dgv = worksheet.Range[worksheet.Cells[, i + ], worksheet.Cells[, i + ]];
                title_dgv.Merge(false);//合并单元格
                title_dgv.Value2 = dgv2.Columns[i].HeaderText;设置单元格内文本
                title_dgv.Font.Name = "宋体";//设置字体
                title_dgv.Font.Size = ;//字体大小
                title_dgv.Borders.LineStyle = Excel.XlLineStyle.xlContinuous;//设置边框
                title_dgv.Borders.Weight = Excel.XlBorderWeight.xlThin;//边框常规粗细
            }
           写入数值
            for (int r = ; r < dgv2.Rows.Count; r++)
            {
                for (int i = ; i < dgv2.ColumnCount; i++)
                {
                    Excel.Range title_dgvT = worksheet.Range[worksheet.Cells[r + , i + ], worksheet.Cells[r + , i + ]];
                   worksheet.Cells[r + , i + ] = dgv.Rows[r].Cells[i].Value;
                    title_dgvT.Merge(false);//合并单元格
                    title_dgvT.Value2 = dgv2.Rows[r].Cells[i].Value;设置单元格内文本
                    title_dgvT.Font.Name = "宋体";//设置字体
                    title_dgvT.Font.Size = ;//字体大小
                    title_dgvT.Borders.LineStyle = Excel.XlLineStyle.xlContinuous;//设置边框
                    title_dgvT.Borders.Weight = Excel.XlBorderWeight.xlThin;//边框常规粗细
                }
                System.Windows.Forms.Application.DoEvents();
            }

            Excel.Range title_auditing = worksheet.Range[worksheet.Cells[dgv.Rows.Count + , ], worksheet.Cells[dgv.Rows.Count + , ]];//选取单元格
            title_auditing.Merge(false);//合并单元格
            title_auditing.Value2 = "会计：";设置单元格内文本
            title_auditing.Font.Name = "宋体";//设置字体
            title_auditing.Font.Size = ;//字体大小 

            Excel.Range title_auditing2 = worksheet.Range[worksheet.Cells[dgv.Rows.Count + , ], worksheet.Cells[dgv.Rows.Count + , ]];//选取单元格
            title_auditing2.Merge(false);//合并单元格
            title_auditing2.Value2 = dgv.Rows[].Cells[].Value;设置单元格内文本
            title_auditing2.Font.Name = "宋体";//设置字体
            title_auditing2.Font.Size = ;//字体大小 

           worksheet.Cells[dgv.Rows.Count + , ] = "财务审核：" + cb_auditing.Text;

            Excel.Range title_docm = worksheet.Range[worksheet.Cells[dgv.Rows.Count + , ], worksheet.Cells[dgv.Rows.Count + , ]];//选取单元格
            title_docm.Merge(false);//合并单元格
            title_docm.Value2 = "制单人：";设置单元格内文本
            title_docm.Font.Name = "宋体";//设置字体
            title_docm.Font.Size = ;//字体大小 

            Excel.Range title_docm2 = worksheet.Range[worksheet.Cells[dgv.Rows.Count + , ], worksheet.Cells[dgv.Rows.Count + , ]];//选取单元格
            title_docm2.Merge(false);//合并单元格
            title_docm2.Value2 = dgv.Rows[].Cells[].Value;设置单元格内文本
            title_docm2.Font.Name = "宋体";//设置字体
            title_docm2.Font.Size = ;//字体大小
           worksheet.Cells[dgv.Rows.Count + , ] = "制单人：" + dgv.Rows[].Cells[].Value;

            worksheet.Columns.EntireColumn.AutoFit();//列宽自适应
            if (saveFileName != "")
            {
                try
                {
                    workbook.Saved = true;
                    workbook.SaveCopyAs(saveFileName);
                }
                catch (Exception ex)
                {
                    MessageBox.Show("导出文件时出错,文件可能正被打开！\n" + ex.Message);
                }
            }
            xlApp.Quit();
            GC.Collect();//强行销毁
           MessageBox.Show("文件： " + fileName + ".xls 保存成功", "信息提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
        }