.net 将GrideView导出为EXCEL 却把整个页面都导出来了
[code=C#][/code] Response.Clear();
  Response.Buffer = true;
  Response.Charset = "utf-8";
  Response.AppendHeader("Content-Disposition", "attachment;filename=" + Server.UrlEncode(filename));
  // Response.ContentEncoding = System.Text.Encoding.GetEncoding("utf-8");//设置输出流为简体中文  
  //Response.ContentType = "application/ms-excel";//设置输出文件类型为excel文件。  
  Response.Charset = "GB2312";

  Response.ContentEncoding = System.Text.Encoding.GetEncoding("GB2312");
  // Response.ContentType = "application/excel";
  Response.ContentType = "application/vnd.ms-excel";
  this.EnableViewState = false;
  System.Globalization.CultureInfo myCItrad = new System.Globalization.CultureInfo("ZH-CN", true);
  System.IO.StringWriter oStringWriter = new System.IO.StringWriter(myCItrad);
  System.Web.UI.HtmlTextWriter oHtmlTextWriter = new System.Web.UI.HtmlTextWriter(oStringWriter);
  ToExcelGrid.RenderControl(oHtmlTextWriter);
  Response.Write(oStringWriter.ToString());
  HttpContext.Current.ApplicationInstance.CompleteRequest();

------解决方案--------------------
我前几天也在纠结这个问题。
lz在前台页面加一个EnableEventValidation="false"

例如
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default.aspx.cs" Inherits="Default" EnableEventValidation="false"%>
------解决方案--------------------
看下面的详细步骤！

C# code

1//注意引入IO空间
 using System.IO;
 


2(1)在源代码<page>里中加入：EnableEventValidation = "false" 

 (2) public void ExcelOut(GridView gv)
    {//导出Excel表的方法
        if (gv.Rows.Count > 0)
        {//有数据行
            Response.Clear();
            Response.ClearContent();
            Response.AddHeader("Content-Disposition","attachment;filename=" + DateTime.Now.ToString("yyyyMMddHHmmss") + ".xls");//以系统时间设置为文件名
            Response.ContentEncoding = System.Text.Encoding.UTF8;//UTF8编码
            Response.ContentType = "application/ms-excel";//文件类型
            StringWriter sw = new StringWriter();
            HtmlTextWriter htw = new HtmlTextWriter(sw);
            gv.RenderControl(htw);
            Response.Write(sw.ToString());
            Response.Flush();
            Response.End();//结束
        }
        else
        {
           Response.Write("没有数据记录");
        }
    }
  （3）  protected void Button1_Click(object sender, EventArgs e)
    {//导出按钮事件
        ExcelOut(GridView1);//调用方法
    }
   （4）public override void VerifyRenderingInServerForm(Control control)//必须有这个方法，这个方法就是空方法，不用加任何东西
    {    }