asp.net 通过 Handler 导出数据至excel (让用户下载)

效果图：

代码：

Export2Excel.ashx

<%@ WebHandler Language="C#" CodeBehind="Export2Excel.ashx.cs" Class="BLIC.SecurityCodeValidate.Web.Handler.Export2Excel" %>

Export2Excel.ashx.cs

using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.SessionState;
using System.IO;
using System.Data;

namespace BLIC.SecurityCodeValidate.Web.Handler
{
    /// <summary>
    /// AdminLogin 的摘要说明
    /// </summary>
    public class Export2Excel : IHttpHandler, IRequiresSessionState
    {

        public void ProcessRequest(HttpContext context)
        {


            try
            {
                test1(context);
            }
            catch (Exception ex)
            {
            }

            //try
            //{
            //    test1(context);
            //}
            //catch (Exception ex)
            //{
            //    //context.Response.ContentType = "text/plain";
            //    context.Response.Write("导出失败：" + ex.Message);
            //}
        }

        public bool IsReusable
        {
            get
            {
                return false;
            }
        }

        private void test1(HttpContext context)
        {
            HttpResponse resp = System.Web.HttpContext.Current.Response;
            resp.Charset = "utf-8";
            resp.Clear();
            string filename = "统计贴标报表_" + DateTime.Now.ToString("yyyyMMddHHmmss");
            resp.AppendHeader("Content-Disposition", "attachment;filename=" + filename + ".xls");
            resp.ContentEncoding = System.Text.Encoding.UTF8;

            resp.ContentType = "application/ms-excel";
            string style = "<meta http-equiv="content-type" content="application/ms-excel; charset=utf-8"/>" + "<style> .table{ font: 9pt Tahoma, Verdana; color: #000000; text-align:center;  background-color:#8ECBE8;  }.table td{text-align:center;height:21px;background-color:#EFF6FF;}.table th{ font: 9pt Tahoma, Verdana; color: #000000; font-weight: bold; background-color: #8ECBEA; height:25px;  text-align:center; padding-left:10px;}</style>";
            resp.Write(style);
 
            resp.Write("<table class='table'><tr><th>姓名</th><th>出生年月</th><th>籍贯</th><th>毕业时间</th></tr>");
           
            System.Data.DataTable dtSource = new System.Data.DataTable();
            dtSource.TableName = "statistic";
            dtSource.Columns.Add("第一列");
            dtSource.Columns.Add("第二列");
            dtSource.Columns.Add("第三列");
            dtSource.Columns.Add("第四列");

            System.Data.DataRow row = null;
            row = dtSource.NewRow();
            row[0] = "张三";
            row[1] = "1987-09-09";
            row[2] = "河北保定";
            row[3] = "2008年毕业";
            dtSource.Rows.Add(row);

            row = dtSource.NewRow();
            row[0] = "李四";
            row[1] = "1987-09-02";
            row[2] = "湖北武汉";
            row[3] = "2009年毕业";
            dtSource.Rows.Add(row);

            row = dtSource.NewRow();
            row[0] = "王五";
            row[1] = "1987-09-01";
            row[2] = "湖南湘潭";
            row[3] = "2013年毕业";
            dtSource.Rows.Add(row);

            foreach (DataRow tmpRow in dtSource.Rows)
            {
                resp.Write("<tr><td>" + tmpRow[0] + "</td>");
                resp.Write("<td>" + tmpRow[1] + "</td>");
                resp.Write("<td>" + tmpRow[2] + "</td>");
                resp.Write("<td>" + tmpRow[3] + "</td>");
                resp.Write("</tr>");
            }
            resp.Write("<table>");

            resp.Flush();
            resp.End();
        }
  
    }
}