asp.net 把数据导出为excel

本篇介绍c#中如何使用DataTable导出Excel，至于其他的导出方法，这里不作介绍！

1.首页从数据库读取数据，得到DataTable:

DataTable dt = HelperExecuteSql.Query("select ID,name,author,newsContent,inDate from newsInfo").Tables[0];

2.使用StringWriter类：将信息写入字符串(其命名空间为：System.IO)

private StringWriter GetStringWriter(DataTable dt)
    {
        StringWriter sw = new StringWriter();
        //读列名,也可以自定义列名（即导出excel的表头）
        //foreach (DataColumn dc in dt.Columns)
        //{ sw.Write(dc.ColumnName + "\t");}
        //表头,自定义
        sw.Write("序号\t");
        sw.Write("新闻名\t");
        sw.Write("作者\t");
        sw.Write("新闻内容\t");
        sw.Write("上传时间\t");//读列值,重新的一行
        sw.Write(sw.NewLine);
        if (dt != null)
        {
            foreach (DataRow dr in dt.Rows)
            {
                for (int i = 0; i < dt.Columns.Count; i++)
                {
                    sw.Write(dr[i].ToString() + "\t");
                }
                sw.Write(sw.NewLine);
            }
        }
        sw.Close();
        return sw;
    }

3. ExcelImport(dt, "新闻列表");

protected void ExcelImport(DataTable dt, string ExportFileName)
    {
        StringWriter sw = GetStringWriter(dt);
        //当前编码
        HttpContext.Current.Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
        //把输出的文件名进行编码
        string fileName = HttpUtility.UrlEncode(ExportFileName, System.Text.Encoding.UTF8);
        //文件名
        string str = "attachment;filename=" + fileName + ".xls";
        //把文件头输出，此文件头激活文件下载框
        HttpContext.Current.Response.AppendHeader("Content-Disposition", str);//http报头文件
        HttpContext.Current.Response.ContentType = "application/ms-excel";
        this.Page.EnableViewState = false;
        Response.Write(sw);
        Response.End();
    }