C#下载

public void Download() {
            Response.Clear();
            Response.ClearHeaders();

            //读取数据内容或者从文件读取或者数据库
            String strD = "这是测试的内容";

            //文件
            StreamReader sr = new StreamReader("C:/object.txt",Encoding.Default);
            string o = sr.ReadToEnd();

            //生成个CSV（和excel基本没有区别，但是操作起来非常的方便）
            /*
             *-----------------------------------------------------------
             *CSV中的换行是\n，下个单元格是,简单吧.
             *-----------------------------------------------------------
             */
            string e = "";
            e += "标题1,标题2,标题3\n";
            e += "内容1,内容2,内容3\n";

            Response.ContentType = "application/vnd.ms-excel";// "text/plain";可以查询我MIME文章中的头信息
            //Response.ContentEncoding = Encoding.GetEncoding("GB2312");// 如果需要发送的话
            String httpHeader = "attachment;filename=download.csv";
            Response.AddHeader("Content-Disposition", httpHeader);
            Response.Write(e);
            Response.Flush();
            Response.End();
        }