通过DataTable导出Excel

//dtData是要导出为Excel的DataTable,FileName是要导出的Excel文件名(不加.xls)
        private void DataTable2Excel(System.Data.DataTable dtData, String FileName)
        {
            System.Web.UI.WebControls.GridView dgExport = null;
            //当前对话
            System.Web.HttpContext curContext = System.Web.HttpContext.Current;
            //IO用于导出并返回excel文件
            System.IO.StringWriter strWriter = null;
            System.Web.UI.HtmlTextWriter htmlWriter = null;

            if (dtData != null)
            {
                //设置编码和附件格式
                //System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8)作用是方式中文文件名乱码
                curContext.Response.AddHeader("content-disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode(FileName, System.Text.Encoding.UTF8) + ".xls");
                curContext.Response.ContentType = "application nd.ms-excel";
                curContext.Response.ContentEncoding = System.Text.Encoding.UTF8;
                curContext.Response.Charset = "GB2312";

                //导出Excel文件
                strWriter = new System.IO.StringWriter();
                htmlWriter = new System.Web.UI.HtmlTextWriter(strWriter);

                //为了解决dgData中可能进行了分页的情况,需要重新定义一个无分页的GridView
                dgExport = new System.Web.UI.WebControls.GridView();
                dgExport.DataSource = dtData.DefaultView;
                dgExport.AllowPaging = false;
                dgExport.DataBind();

                //下载到客户端
                dgExport.RenderControl(htmlWriter);
                curContext.Response.Write(strWriter.ToString());
                curContext.Response.End();
            }
        }