只能在执行 Render() 的过程中调用 RegisterForEventValidation(RegisterForEventValidation can only be called during Render(); )
当用GridView导出Execl的时候，会发生只能在执行 Render() 的过程中调用 RegisterForEventValidation的错误提示。
有两种方法可以解决以上问题：
1.修改web.config(不推荐)<pages enableEventValidation ="false" ></pages>
2.直接在导出Execl的页面修改
<%
@ Page Language="C#" EnableEventValidati
on = "false" AutoEventWireup="true"
CodeFile="ExportGridView.aspx.cs" Inherits="ExportGridView" %>
附：Gridview导出Execl可分页全部导出代码(C#)
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 EXportTest : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!Page.IsPostBack)
{
BindData();
}
}
private string ConnectionString
{
get
{ return @"Server=localhost;Database=Northwind;
Trusted_Connection=true"; }
}
private void BindData()
{
// make the query
string query = "SELECT * FROM Categories";
SqlConnection myConnection = new SqlConnection(ConnectionString);
SqlDataAdapter ad = new SqlDataAdapter(query, myConnection);
DataSet ds = new DataSet();
ad.Fill(ds, "Categories");
GridView1.DataSource = ds;
GridView1.DataBind();
/**//* It's a good idea if you can Cache the DataSet */
}
public override void VerifyRenderingInServerForm(Control control)
{
// Confirms that an HtmlForm control is rendered for
the specified ASP.NET server control at run time.
}
protected void Button1_Click(object sender, EventArgs e)
{
Response.Clear();
Response.AddHeader("content-disposition",
"attachment;filename=FileName.xls");
Response.Charset = "";
// If you want the option to open the Excel file without saving than
// comment out the line below
// Response.Cache.SetCacheability(HttpCacheability.NoCache);
Response.ContentType = "application/vnd.xls";
System.IO.StringWriter stringWrite = new System.IO.StringWriter();
System.Web.UI.HtmlTextWriter htmlWrite =
new HtmlTextWriter(stringWrite);
// turn off paging
GridView1.AllowPaging = false;
BindData();
GridView1.RenderControl(htmlWrite);
Response.Write(stringWrite.ToString());
Response.End();
// turn the paging on again
GridView1.AllowPaging = true;
BindData();
}
protected void GridView1_PageIndexChanging(object sender,
GridViewPageEventArgs e)
{
GridView1.PageIndex = e.NewPageIndex;
BindData();
}
}
VB.net:(GridView直接帮定DataSource控件)
Imports Microsoft.VisualBasic
Imports System
Imports System.IO
Partial Class ManageContentsClass ManageContents
Inherits System.Web.UI.Page
Protected Sub Page_Load()Sub Page_Load(ByVal sender As Object, ByVal e As System.EventArgs) Handles Me.Load
'If Not Me.IsPostBack Then
' If Request.QueryString("username") <> "xucanzhao" Then
' Response.Redirect("default.aspx?returnUrl=nousername")
' End If
'End If
' ClientScript.RegisterStartupScript(Me.GetType(), "haha", "<script>alert('haha');</script>")
End Sub
Protected Sub btnExportExcel_Click()Sub btnExportExcel_Click(ByVal sender As Object, ByVal e As System.EventArgs) Handles btnExportExcel.Click
Response.Clear()
Response.Buffer = True
Response.Charset = "utf-8"
Response.AddHeader("Content-Disposition", "attachment;filename=FileFlow.xls")
Response.ContentType = "application/ms-excel"
Dim strWriter As New StringWriter()
Dim htw As New HtmlTextWriter(strWriter)
GridView1.AllowPaging = False
GridView1.DataBind()
GridView1.RenderControl(htw)
Response.Write(strWriter.ToString)
Response.End()
GridView1.AllowPaging = True
GridView1.DataBind()
End Sub
Public Overrides Sub verifyRenderingInServerForm()Sub verifyRenderingInServerForm(ByVal control As Control)
End Sub
End Class
****
类型“GridView”的控件“GridView1”必须放在具有 runat=server 的窗体标记内。
public override void VerifyRenderingInServerForm(Control control)
...{
//base.VerifyRenderingInServerForm(control);
}
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