前提条件：你的GridView已经能正常显示数据了，不管你是用代码实现的，还是直接绑定数据库实现的。
1、如果你的GridView启动了分页功能，则要先将该功能关闭，即将allowpaging的属性设为false, AllowPaging="false"；然后重新调用databind()或者你自己定义的显示函数，确保所有的数据都显示在GridView中，再导完数据之后，记得把allowpaging的属性值改回来。
2、在页面中添加一个"导出"按钮，当点击该按钮时执行导出动作。双击改按钮，编写事件处理函数，添加代码如下：在用到StringWriter类的时候，要在。aspx.cs文件的头部添加命名空间：using System.IO;
protected void Button1_Click(object sender, EventArgs e)
{ //导出到Excel中（.xls文件）
Response.ClearContent();
Response.AddHeader("content-disposition", "attachment;filename=MyExcel2.xls");
/*
导出时会弹出对话框让你确认保存位置，默认的文件名为MyExcel2.xls，
你可以选择保存，也可以直接打开
*/
Response.ContentType = "application/excel";
/*
如果想将文件导出到word中，则将上面的"MyExcel2.xsl"改成"MyWord.doc",
将"application/excel"改成"application/word"
*/
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
GridView1.AllowPaging = false;
GridView1.DataBind();
GridView1.RenderControl(htw);
Response.Write(sw.ToString());
Response.End();
GridView1.AllowPaging = true;
}
3、重写VerifyRenderingInServerForm 函数，这样才能确保运行时为指定的ASP.NET 服务器控件呈现HtmlForm 控件；函数的内容可以为空：
public override void VerifyRenderingInServerForm(Control control)
{}
4、当出现"只能在执行Render() 的过程中调用 RegisterForEventValidation；"错误时，参考下面网址：https://www.ezloo.com/2008/10/render_registerforeventvalidation.html 解决问题
以下是一个比较完整的实现"将GridView中的数据导出到Word中"的代码：
using System;
using System.Data;
using System.Configuration;
using System.Collections;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
using System.IO;public partial class GridView_Export_Excel : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
BindData();
}
}
private void BindData()
{
string Constr="server=localhost; uid=test;pwd=test;database=test";
string sqlstr="select * from my_test";
SqlConnection con = new SqlConnection(Constr);
SqlDataAdapter ad = new SqlDataAdapter(sqlstr, con);
DataSet ds = new DataSet();
ad.Fill(ds);
GridView1.DataSource = ds;
GridView1.DataBind();
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.ClearContent();
Response.AddHeader("content-disposition", "attachment;filename=MyExcel.doc");
Response.ContentType = "application/word";
StringWriter sw = new StringWriter();
HtmlTextWriter htw = new HtmlTextWriter(sw);
GridView1.AllowPaging = false;
BindData();
GridView1.RenderControl(htw);
Response.Write(sw.ToString());
Response.End();
GridView1.AllowPaging = true;
}
public override void VerifyRenderingInServerForm(Control control)
{}
protected void GridView1_PageIndexChanging(object sender, GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
}
protected void GridView1_PageIndexChanged(object sender, EventArgs e)
{
BindData();
}
}