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"] = "20150425001";
        row1["总金额(元)"] = "0.03";
        row1["总笔数"] = "1";
        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"] = "2015041800001000770049196543";
        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 = 1;//当前行数
        int colIndex = 0;//当前列数


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


        for (int i = 0; i < ds.Tables.Count; i++)
        {
            DataTable table = ds.Tables[i];
            colIndex = 0;//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 = 0;
                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(0).CreateCell(0);
cell.SetCellValue(new DateTime(2008,5,5));
//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();
     }