c# 导出数据到Excel模板

最近在做一个发邮件的功能，客户要求需要导出一个Excel附件，并给了附件的格式，

eg:

Last Name 姓	First Name 名	Chinese Characters 汉字书写(仅大陆人填写)

实现方式有两种：

一、使用Microsoft.Office.Interop.Excel组件的方式

二、使用NPOI的方式

下面讲一下这两种方式的具体实现：

一、使用Microsoft.Office.Interop.Excel组件的方式

该方式需要引入Microsoft.Office.Interop.Excel；System.Reflection

实现代码：

 /// <summary>
 /// 生成附件（使用Microsoft.Office.Interop.Excel组件的方式）
 /// </summary>
 /// <param name="DT"></param>
 /// <returns></returns>
 public static void GenerateAttachment(DataTable DT)
 {
     try
     {
         //需要添加 Microsoft.Office.Interop.Excel引用
         Microsoft.Office.Interop.Excel.Application app = new Microsoft.Office.Interop.Excel.Application();
         if (app == null)//服务器上缺少Excel组件，需要安装Office软件
         {
             return;
         }
         app.Visible = false;
         app.UserControl = true;
         string strTempPath = Application.StartupPath + "\\EmailTemplate\\TE Enrollment Form.xls";
         Microsoft.Office.Interop.Excel.Workbooks workbooks = app.Workbooks;
         Microsoft.Office.Interop.Excel._Workbook workbook = workbooks.Add(strTempPath); //加载模板
         Microsoft.Office.Interop.Excel.Sheets sheets = workbook.Sheets;
         Microsoft.Office.Interop.Excel._Worksheet worksheet = (Microsoft.Office.Interop.Excel._Worksheet)sheets.get_Item(); //第一个工作薄。
         if (worksheet == null)//工作薄中没有工作表
         {
             return;
         }

         //1、获取数据
         int rowCount = DT.Rows.Count;
         if (rowCount < )//没有取到数据
         {
             return;
         }

         //2、写入数据，Excel索引从1开始
         for (int i = ; i <= rowCount; i++)
         {
             int row_ =  + i;  //Excel模板上表头占了1行
             int dt_row = i - ; //dataTable的行是从0开始的
             worksheet.Cells[row_, ] = DT.Rows[dt_row]["Lastname_EN"].ToString();
             worksheet.Cells[row_, ] = DT.Rows[dt_row]["Firstname_EN"].ToString();
             worksheet.Cells[row_, ] = DT.Rows[dt_row]["namechinese"].ToString();
         }
         //调整Excel的样式。
         Microsoft.Office.Interop.Excel.Range rg = worksheet.Cells.get_Range("A3", worksheet.Cells[rowCount + , ]);
         rg.Borders.LineStyle = ; //单元格加边框
         worksheet.Columns.AutoFit(); //自动调整列宽

         //隐藏某一行
         //选中部分单元格，把选中的单元格所在的行的Hidden属性设为true
         //worksheet.get_Range(app.Cells[2, 1], app.Cells[2, 32]).EntireRow.Hidden = true;

         //删除某一行
         worksheet.get_Range(app.Cells[, ], app.Cells[, ]).EntireRow.Delete(Microsoft.Office.Interop.Excel.XlDirection.xlUp);

         //3、保存生成的Excel文件
         //Missing在System.Reflection命名空间下
         string savePath = Application.StartupPath + "\\Temp\\TEEnrollmentForm\\TE Enrollment Form.xls";
         workbook.SaveAs(savePath, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Microsoft.Office.Interop.Excel.XlSaveAsAccessMode.xlNoChange, Missing.Value, Missing.Value, Missing.Value, Missing.Value, Missing.Value);

         //4、按顺序释放资源
         NAR(worksheet);
         NAR(sheets);
         NAR(workbook);
         NAR(workbooks);
         app.Quit();
         NAR(app);
     }
     catch (Exception ex)
     {
         WriteLog(ex.ToString());
     }
 }
 /// <summary>
 /// 释放资源
 /// </summary>
 /// <param name="o"></param>
 public static void NAR(object o)
 {
     try
     {
         System.Runtime.InteropServices.Marshal.ReleaseComObject(o);
     }
     catch (Exception ex)
     {
         WriteLog(ex.ToString());
     }
     finally
     {
         o = null;
     }
 }

二、使用NPOI的方式

该方式需要引用NPOI.dll

实现代码：

 /// <summary>
 /// ExportExcel（使用NPOI的方式）
 /// </summary>
 /// <param name="DT"></param>
 public static void ExportExcel(DataTable DT)
 {
     try
     {
         HSSFWorkbook hssfworkbookDown;
         string modelExlPath = Application.StartupPath + "\\EmailTemplate\\TE Enrollment Form.xls";
         if (File.Exists(modelExlPath) == false)//模板不存在
         {
             return;
         }
         using (FileStream file = new FileStream(modelExlPath, FileMode.Open, FileAccess.Read))
         {
             hssfworkbookDown = new HSSFWorkbook(file);
             file.Close();
         }
         if (DT.Rows.Count > )
         {
             WriterExcel(hssfworkbookDown, , DT);

             string filename = "TE Enrollment Form.xls";
             string strFilePath = Application.StartupPath + "\\Temp\\TEEnrollmentForm";
             if (Directory.Exists(strFilePath) == false)
             {
                 Directory.CreateDirectory(strFilePath);
             }
             strFilePath = strFilePath + "\\" + filename;
             FileStream files = new FileStream(strFilePath, FileMode.Create);
             hssfworkbookDown.Write(files);
             files.Close();
             if (File.Exists(strFilePath) == false)//附件生成失败
             {
                 return;
             }
         }
     }
     catch (Exception ex)
     {
         WriteLog(ex.ToString());
     }
 }
 /// <summary>
 /// WriterExcel
 /// </summary>
 /// <param name="hssfworkbookDown"></param>
 /// <param name="sheetIndex"></param>
 /// <param name="DT"></param>
 public static void WriterExcel(HSSFWorkbook hssfworkbookDown, int sheetIndex, DataTable DT)
 {
     try
     {
         #region 设置单元格样式
         //字体
         HSSFFont fontS9 = (HSSFFont)hssfworkbookDown.CreateFont();
         fontS9.FontName = "Arial";
         fontS9.FontHeightInPoints = ;
         fontS9.Boldweight = (short)NPOI.SS.UserModel.FontBoldWeight.NORMAL;
         //表格
         ICellStyle TableS9 = (ICellStyle)hssfworkbookDown.CreateCellStyle();
         TableS9.BorderLeft = NPOI.SS.UserModel.BorderStyle.THIN;
         TableS9.BorderTop = NPOI.SS.UserModel.BorderStyle.THIN;
         TableS9.BorderBottom = NPOI.SS.UserModel.BorderStyle.THIN;
         TableS9.BorderRight = NPOI.SS.UserModel.BorderStyle.THIN;
         TableS9.WrapText = true;
         TableS9.SetFont(fontS9);
         #endregion

         HSSFSheet sheet = (HSSFSheet)hssfworkbookDown.GetSheetAt(sheetIndex);
         hssfworkbookDown.SetSheetHidden(sheetIndex, false);
         hssfworkbookDown.SetActiveSheet(sheetIndex);

         int n = ;//因为模板有表头，所以从第2行开始写
         for (int j = ; j < DT.Rows.Count; j++)
         {
             HSSFRow dataRow = (HSSFRow)sheet.CreateRow(j + n);
             string strDepID = DT.Rows[j]["relationship"].ToString().Trim();
             dataRow.CreateCell();
             dataRow.Cells[].SetCellValue(strDepID == "" ? DT.Rows[j]["Lastname_EN"].ToString() : "");
             dataRow.CreateCell();
             dataRow.Cells[].SetCellValue(strDepID == "" ? DT.Rows[j]["Firstname_EN"].ToString() : "");
             dataRow.CreateCell();
             dataRow.Cells[].SetCellValue(strDepID == "" ? DT.Rows[j]["namechinese"].ToString() : "");

             for (int i = ; i <= ; i++)//循环列，添加样式
             {
                 dataRow.Cells[i].CellStyle = TableS9;
             }
         }
         //设定第一行，第一列的单元格选中
         sheet.SetActiveCell(, );
     }
     catch (Exception ex)
     {
         WriteLog(ex.ToString());
     }
 }

最终效果展示：