protected void btnExport_Click(object sender, EventArgs e)
    {           
        //导出全部数据，取消分页
        gvInfo.AllowPaging = false;
        gvInfo.ShowFooter = false;

GetDataSource(condition);

Response.Clear();
        Response.Buffer = true;
        Response.Charset = "utf-8";
        Response.AppendHeader("Content-Disposition", "attachment;filename=" + System.Web.HttpUtility.UrlEncode("导出" + System.DateTime.Now.Date.ToString("yyyyMMdd")) + ".xls");
        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。
        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);

ClearControls(gvInfo);
        this.gvInfo.RenderControl(oHtmlTextWriter);
        Response.Write(oStringWriter.ToString());
        Response.End();

//还原分页显示
        gvInfo.AllowPaging = true;
        gvInfo.ShowFooter = true;
        GetDataSource(condition);
    }

/// <summary>
    /// GridView如果需要实现导出Excel功能，则该函数需要重载
    /// </summary>
    /// <param name="control"></param>
    public override void VerifyRenderingInServerForm(Control control)
    {
        // Confirms that an HtmlForm control is rendered for
    }

/// <summary>
    /// 清除控件中的所有控件，以便导出Excel
    /// </summary>
    /// <param name="control"></param>
    private void ClearControls(Control control)
    {
        for (int i = control.Controls.Count - 1; i >= 0; i--)
        {
            ClearControls(control.Controls[i]);
        }

if (!(control is TableCell))
        {
            if (control.GetType().GetProperty("SelectedItem") != null)
            {
                LiteralControl literal = new LiteralControl();
                control.Parent.Controls.Add(literal);
                try
                {
                    literal.Text = (string)control.GetType().GetProperty("SelectedItem").GetValue(control, null);
                }
                catch
                {
                }
                control.Parent.Controls.Remove(control);
            }
            else if (control.GetType().GetProperty("Text") != null)
            {
                LiteralControl literal = new LiteralControl();
                control.Parent.Controls.Add(literal);
                literal.Text = (string)control.GetType().GetProperty("Text").GetValue(control, null);
                control.Parent.Controls.Remove(control);
            }
        }
        return;
    }