数据导出excel 使用将 DataTable导出为excel

 /// 把DataTable内容导出伟excel并返回客户端
         /// </summary>
        /// <param name="dgData">待导出的DataTable</param>       
       
         ///  DataTable dt = DB.GetTable(strsql);
         ///  DataTable2Excel(dt);
         ///
         public static void DataTable2Excel(System.Data.DataTable dtData)
        {
            System.Web.UI.WebControls.DataGrid 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
                curContext.Response.ContentType = "application/vnd.ms-excel";
                curContext.Response.ContentEncoding =System.Text.Encoding.UTF8;
                curContext.Response.Charset = "";
                
                // 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DataGrid
               dgExport = new System.Web.UI.WebControls.DataGrid();
                dgExport.DataSource = dtData.DefaultView;
                dgExport.AllowPaging = false;
                dgExport.DataBind();
 
                // 返回客户端
                dgExport.RenderControl(htmlWriter);    
                curContext.Response.Write(strWriter.ToString());
                curContext.Response.End();
            }
        }