Web C# 导出Excel 方法总结

方法1：微软推荐服务器需安装Excel型

依赖：

软件：Office Excel 2007-2013

引用：Microsoft Office 14.0 Object Library

1.1 数据准备

 //Excel文件名称
     string ExcelName = System.DateTime.Now.ToString("yyMMdd") + "退款结算单.xlsx";

     /// <summary>
     /// 批量退款
     /// </summary>
     /// <param name="sender"></param>
     /// <param name="e"></param>
     protected void Button1_Click(object sender, EventArgs e)
     {
         DataSet ds = new DataSet();

         DataTable dt1 = new DataTable();
         dt1.Columns.Add("批次号");
         dt1.Columns.Add("总金额(元)");
         dt1.Columns.Add("总笔数");

         DataRow row1 = dt1.NewRow();

         row1 = dt1.NewRow();
         row1["批次号"] = "";
         row1["总金额(元)"] = "0.03";
         row1["总笔数"] = "";
         dt1.Rows.Add(row1);

         ds.Tables.Add(dt1);

         DataTable dt2 = new DataTable();
         dt2.Columns.Add("商户订单号");
         dt2.Columns.Add("支付宝交易号");
         dt2.Columns.Add("退款金额");
         dt2.Columns.Add("退款备注");

         DataRow row2 = dt2.NewRow();

         row2 = dt2.NewRow();
         row2["商户订单号"] = "D150418092109-40";
         row2["支付宝交易号"] = "";
         row2["退款金额"] = "0.02";
         row2["退款备注"] = "导入excel测试";
         dt2.Rows.Add(row2);

         ds.Tables.Add(dt2);

         doExport(ds, Server.MapPath(ExcelName));
     }

1.2 数据写入

  private Microsoft.Office.Interop.Excel.Application _Excel = null;

     /// <summary>
     /// 将 DataSet 数据写入 _Excel
     /// </summary>
     /// <param name="ds"></param>
     /// <param name="strExcelFileName"></param>
     private void doExport(DataSet ds, string strExcelFileName)
     {
         int rowIndex = ;//当前行数
         int colIndex = ;//当前列数

         _Excel = new Microsoft.Office.Interop.Excel.Application();
         _Excel.Application.Workbooks.Add(true);

         for (int i = ; i < ds.Tables.Count; i++)
         {
             DataTable table = ds.Tables[i];
             colIndex = ;//列初始化
             // 列标题
             foreach (DataColumn col in table.Columns)
             {
                 colIndex++;
                 _Excel.Cells[rowIndex, colIndex] = col.ColumnName;
             }

             // 内容
             foreach (DataRow row in table.Rows)
             {
                 rowIndex++;
                 colIndex = ;
                 foreach (DataColumn col in table.Columns)
                 {
                     colIndex++;
                     _Excel.Cells[rowIndex, colIndex] = "'" + row[col.ColumnName].ToString();
                 }
             }

             rowIndex++;//行+1 防止table又多个情况
         }

         _Excel.Visible = false;
         // 保存文件
         SaveToDisk(strExcelFileName);

         _Excel.Quit();
         _Excel = null;
     }

1.3 数据导出

   /// <summary>
     /// 导出方法
     /// </summary>
     /// <param name="path">路径</param>
     private void SaveToDisk(string path)
     {
         if (!string.IsNullOrEmpty(path))
         {
             System.IO.FileInfo info = new FileInfo(path);
             if (!info.Exists)
             {
                 _Excel.ActiveWorkbook.SaveCopyAs(path);

                 /*
                 微软为Response对象提供了一个新的方法TransmitFile来解决使用Response.BinaryWrite
                 下载超过400mb的文件时导致Aspnet_wp.exe进程回收而无法成功下载的问题。
                 代码如下：
                */
                 Response.ContentType = "text/xml";
                 Response.AddHeader("Content-Disposition", "attachment;filename=" + ExcelName);
                 string filename = Server.MapPath(ExcelName);
                 Response.TransmitFile(filename);
             }
             else
             {
                 info.Delete();
                 _Excel.DisplayAlerts = false;
                 _Excel.AlertBeforeOverwriting = false;
                 _Excel.ActiveWorkbook.SaveCopyAs(path);
             }
         }
     }

方法2：第三方组件NPOI（2.0版本后受到微软支持）

依赖：

NPOI.dll

NPOI.OOXML.dll

NPOI.OpenXml4Net.dll

NPOI.OpenXmlFormats.dll

NPOI下载地址 - http://npoi.codeplex.com/releases

2.1 简单例子：

 using NPOI.XSSF.UserModel;
 using NPOI.SS.UserModel;

 //创建全新的Workbook
 IWorkbook workbook = new XSSFWorkbook();

 //创建Sheet
 workbook.CreateSheet("Sheet1");

 //写入一个简单日期 并设置格式
 ISheet sheet = hssfworkbook.CreateSheet("Sheet1");
 ICell cell = sheet.CreateRow().CreateCell();
 cell.SetCellValue(new DateTime(,,));
 //set date format
 ICellStyle cellStyle = hssfworkbook.CreateCellStyle();
 IDataFormat format = hssfworkbook.CreateDataFormat();
 cellStyle.DataFormat = format.GetFormat("yyyy年m月d日");
 cell.CellStyle=cellStyle;

 //保存Workbook
 FileStream sw = File.Create("test.xlsx");
 workbook.Write(sw);
 sw.Close();

这样就好了。

2.2 复杂例子（包含下载功能）

     /// <summary>
     /// 导出Excel
     /// </summary>
     /// <param name="ExcelName">文件名称</param>
     public void NPOIExcel(DataSet ds, string ExcelName)
     {
         int row_index = 0;
         //创建全新的Workbook
         IWorkbook workbook = new XSSFWorkbook();

         //创建Sheet
         workbook.CreateSheet("Sheet1");

         //根据Sheet名字获得Sheet对象
         ISheet sheet = workbook.GetSheet("Sheet1");
         IRow row;

         row = sheet.CreateRow(row_index);
         for (int i = 0; i < ds.Tables.Count; i++)
         {
             //写入标题
             for (int j = 0; j < ds.Tables[i].Columns.Count; j++)
             {
                 row.CreateCell(j).SetCellValue(ds.Tables[i].Columns[j].Caption.ToString());

             }
             row = sheet.CreateRow(++row_index);

             //写入数据
             foreach (DataRow r in ds.Tables[i].Select())
             {
                 for (int j = 0; j < ds.Tables[i].Columns.Count; j++)
                 {
                     row.CreateCell(j).SetCellValue(r[j].ToString());
                 }

                 row = sheet.CreateRow(++row_index);
             }

         }

         //保存Workbook方式一： 以文件形式保存到服务器中（每次导出都会生成一个文件，慎重使用）
         FileStream sw = File.Create(Server.MapPath("file/" +ExcelName));
         workbook.Write(sw);
         sw.Close();

         //保存Workbook方式二： 保存到内存流中
         var stream = new MemoryStream();
         workbook.Write(stream);

         //文件下载
         Response.Clear();
         Response.Charset = "utf-8";
         Response.Buffer = true;
         this.EnableViewState = false;
         Response.ContentEncoding = System.Text.Encoding.UTF8;

         Response.ContentType = "application/vnd.ms-excel";
         Response.AddHeader("Content-Disposition", "attachment;filename="+ExcelName);

         string filename =Server.MapPath("file/" + ExcelName);//通过服务器文件下载
         Response.WriteFile(filename);
         Response.BinaryWrite(StreamToBytes(stream));//通过内存流下载，StreamToBytes为Stream转byte[] 方法 可查看我其他随笔有
         Response.Flush();   Response.Close();
         Response.End();
     }