Object reference not set to an instance of an object.
我做的网站在本地测试都是好的 一切正常 但是发布到网站上去的时候就出现了Object reference not set to an instance of an object. 这个问题前台html
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="Customer_More.aspx.cs" Inherits="News_more" %>
<%@ Register Src="Controllers/Bottom.ascx" TagName="Bottom" TagPrefix="uc4" %>
<%@ Register Src="Controllers/Top.ascx" TagName="Top" TagPrefix="uc1" %>
<%@ Register Src="Controllers/Left.ascx" TagName="Left" TagPrefix="uc2" %>
<html>
<head>
<title><%=Titlep %></title>
<meta http-equiv="Content-Type" content="text/html; charset=gb2312" />
<meta content="<%= Descriptionp%>" name="description"/>
<meta content="<%=Keywordsp %>" name="keywords" />
<link href="Images/css.css" rel="stylesheet" type="text/css" />
</head>
<body style="text-align: center">
<form id=form1 runat=server>
<table border="0" align="center" cellpadding="0" cellspacing="0" style="width: 778px">
<tr>
<td style="width: 100px">
<uc1:Top ID="Top1" runat="server" />
</td>
</tr>
</table>
<table border="0" align="center" cellpadding="0" cellspacing="0" style="width: 778px; background-color: #ffffff;">
<tr>
<td style="height: 395px">
<table border="0" cellpadding="0" cellspacing="0" style="width: 778px">
<tr>
<td width="183" align="left"><div align="left">
<uc2:Left ID="Left1" runat="server" />
</div></td>
<td width="595" valign="top"><div align="center">
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td> </td>
</tr>
</table>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><img src="Images/a4.jpg" width="585" height="37"></td>
</tr>
</table>
<table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td style="height: 115px"><table width="100%" border="0" cellspacing="0" cellpadding="0">
<tr>
<td><center><asp:Label ID="Ltitle" runat="server" Text="标题"></asp:Label></center></td>
</tr>
<tr>
<td style="height: 4px"> <asp:Label ID="Lcontent" runat="server" Text="内容"></asp:Label></td>
</tr>
</table></td>
</tr>
</table>
</div>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td style="width: 100px">
<uc4:Bottom ID="Bottom1" runat="server" />
</td>
</tr>
</table></form>
</body>
</html>
.cs代码
using System;
using System.Data;
using System.Data.OleDb;
using System.Configuration;
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;
public partial class _Default : System.Web.UI.Page
{
public string Titlep="1";
public string Descriptionp="2";
public string Keywordsp="3";
protected void Page_Load(object sender, EventArgs e)
{
this.BindToList();
}
private void BindToList()
{
//title,des,con
GetContent drt = new GetContent();
OleDbDataReader drf = drt.GetTDC();
if(drf.Read())
{
// this.Titlep=Request.QueryString["Title"];
// this.Descriptionp=Request.QueryString["Description"];
// this.Keywordsp=Request.QueryString["Keywords"];
this.Titlep = drf["Title"].ToString();
this.Descriptionp = drf["Description"].ToString();
this.Keywordsp = drf["Keywords"].ToString();
}
drf.Close();
//品牌
GetContent getb = new GetContent();
OleDbDataReader drb = getb.GetMrjp();
this.GridList1.DataSource = drb;
// this.DataGrid1.DataSource = drb;
//this.DataGrid1.DataBind();
this.GridList1.DataBind();
drb.Close();
GetContent geta = new GetContent();
OleDbDataReader dra = geta.GetTzrm();
this.GridList2.DataSource = dra;
this.GridList2.DataBind();
//this.DataGrid2.DataSource = drb;
//this.DataGrid2.DataBind();
dra.Close();
//新闻列表
GetContent gettop = new GetContent();
OleDbDataReader drnt = gettop.GetNewsTop();
this.GridList.DataSource = drnt;
this.GridList.DataBind();
drnt.Close();
//大图片
GetContent getnewstop = new GetContent();
OleDbDataReader dr = getnewstop.GetNewsImagesTop();
while (dr.Read())
{
//this.Image1.ImageUrl = "Upload/" + dr["img"].ToString();
//this.HyperLink1.Text = dr["title"].ToString();
// this.HyperLink1.NavigateUrl = "news_more.aspx?id=" + dr["id"].ToString();
}
dr.Close();
}
protected void GridList_SelectedIndexChanged(object sender, EventArgs e)
{
}
}
类文件部分代码
public OleDbDataReader GetTDC()
{
OleDbHelper.OleDbHelper helper = new OleDbHelper.OleDbHelper();
OleDbDataReader dr;
helper.RunCmd("select * from title", out dr);
return (dr);
}
大虾们救我啊 急等 --------------------编程问答-------------------- 空引用.. --------------------编程问答-------------------- http://www.diybl.com/course/4_webprogram/asp.net/netjs/20090313/161332.html --------------------编程问答-------------------- 哈哈，我刚发布一个网站出现了这个问题，解决了！ --------------------编程问答-------------------- 这个是权限问题，你得给你这个网站文件夹或是你用到的文件夹分权限 --------------------编程问答-------------------- 要看哪一行出错，有可能的是取数据的方法内部出了异常，给catch掉了，然后返回一个空的对象。 --------------------编程问答-------------------- 不是你的Request.QueryString是NULL就是你的数据表里的数据是null --------------------编程问答--------------------
同样的问题，大家看看啊
“我做的网站在本地测试都是好的 一切正常 但是发布到网站上去的时候就出现了Object reference not set to an instance of an object. 这个问题 ” --------------------编程问答-------------------- 数据库链接正常么？有该ip地址么？
我前几天发布就犯了这个低级错误 --------------------编程问答-------------------- 你能确保你的 trans 又实例化？
你肯定连接都没打开
catch(Exception ex) {
if(trans != null) {
trans.Rollback();
}
throw;
} --------------------编程问答-------------------- 我滴天代码这么长 --------------------编程问答--------------------
你的PublicGetDB.ExecData()方法里有空引用～ --------------------编程问答-------------------- 楼主看看黄页上的堆栈信息～，最后调用的是哪个方法报错了。 --------------------编程问答-------------------- 还是不太懂<a href='http://www.baidu.com'>还是百度吧</a> --------------------编程问答-------------------- <a href="http://www.diybl.com/course/4_webprogram/asp.net/netjs/20090313/161332.html" target="_blank" >http://www.diybl.com/course/4_webprogram/asp.net/netjs/20090313/161332.html</a>这是什么呀
补充：.NET技术 , ASP.NET
