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//定义文档类型、字符编码Response.Clear();
 Response.Buffer= true;
 Response.Charset="GB2312";
 //下面这行很重要, attachment 参数表示作为附件下载,您可以改成 online在线打开
 //filename=FileFlow.xls 指定输出文件的名称,注意其扩展名和指定文件类型相符,可以为:.doc    .xls    .txt   .htm
 Response.AppendHeader("Content-Disposition","attachment;filename=FileFlow.xls");
 Response.ContentEncoding=System.Text.Encoding.GetEncoding("GB2312");
 //Response.ContentType指定文件类型 可以为application/ms-excel、application/ms-word、application/ms-txt、application/ms-html 或其他浏览器可直接支持文档
 Response.ContentType = "application/ms-excel";
 this.EnableViewState = false;
 // 定义一个输入流
 System.IO.StringWriter oStringWriter = new System.IO.StringWriter();
 System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
                this.Table_Report.RenderControl(oHtmlTextWriter);//this 表示输出本页,你也可以绑定datagrid,或其他支持obj.RenderControl()属性的控件
 Response.Write(oStringWriter.ToString());
 Response.End();
 
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