private void Page_Load(object sender, System.EventArgs e)
{
string newsid = Request.QueryString["uname"].ToString().Trim();
if(!this.IsPostBack)
{
if (Session["com_uname"]==null||Session["com_uname"].ToString()=="")
{
HyperLink1.Visible=false;
HyperLink2.Visible=false;
}
else
{
HyperLink1.Visible=true;
HyperLink2.Visible=true;
HyperLink1.NavigateUrl="company1/addfav.aspx?id="+newsid;
HyperLink2.NavigateUrl="company1/MAIL_SEND.aspx?reid="+newsid;
} SqlConnection MyConnection =new SqlConnection(ConfigurationSettings.AppSettings["cnFriends.ConnectionString"]);
string strSel1 = "UPDATE person SET click=click+1 WHERE uname='"+newsid+"'";
SqlCommand myCommand= new SqlCommand("proc_per_list",MyConnection);
myCommand.CommandType=CommandType.StoredProcedure;
SqlParameter uid=new SqlParameter("@uname",SqlDbType.VarChar,10);
uid.Value=newsid;
myCommand.Parameters.Add(uid);
SqlDataAdapter myAdapter = new SqlDataAdapter(myCommand);
SqlCommand myCommand1= new SqlCommand(strSel1,MyConnection);
MyConnection.Open();
myCommand1.ExecuteNonQuery();
myCommand.ExecuteNonQuery();
DataSet ds = new DataSet();
myAdapter.Fill( ds,"Table1" );
Repeater1.DataSource = ds.Tables["Table1"].DefaultView;
Repeater1.DataBind();
MyConnection.Close(); }
---------------
将对象引用设置到对象的实例。
说明: 执行当前 Web 请求期间,出现未处理的异常。请检查堆栈跟踪信息,以了解有关该错误以及代码中导致错误的出处的详细信息。
异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。
源错误:
行 33: if (Session["com_uname"]==null||Session["com_uname"].ToString()=="")
行 34: {
行 35: HyperLink1.Visible=false;
行 36: HyperLink2.Visible=false;
行 37: }
去掉 判断SESSION那段IF ELSE 就正常显示 但是HyperLink1.Visible效果没有??????????????????
{
string newsid = Request.QueryString["uname"].ToString().Trim();
if(!this.IsPostBack)
{
if (Session["com_uname"]==null||Session["com_uname"].ToString()=="")
{
HyperLink1.Visible=false;
HyperLink2.Visible=false;
}
else
{
HyperLink1.Visible=true;
HyperLink2.Visible=true;
HyperLink1.NavigateUrl="company1/addfav.aspx?id="+newsid;
HyperLink2.NavigateUrl="company1/MAIL_SEND.aspx?reid="+newsid;
} SqlConnection MyConnection =new SqlConnection(ConfigurationSettings.AppSettings["cnFriends.ConnectionString"]);
string strSel1 = "UPDATE person SET click=click+1 WHERE uname='"+newsid+"'";
SqlCommand myCommand= new SqlCommand("proc_per_list",MyConnection);
myCommand.CommandType=CommandType.StoredProcedure;
SqlParameter uid=new SqlParameter("@uname",SqlDbType.VarChar,10);
uid.Value=newsid;
myCommand.Parameters.Add(uid);
SqlDataAdapter myAdapter = new SqlDataAdapter(myCommand);
SqlCommand myCommand1= new SqlCommand(strSel1,MyConnection);
MyConnection.Open();
myCommand1.ExecuteNonQuery();
myCommand.ExecuteNonQuery();
DataSet ds = new DataSet();
myAdapter.Fill( ds,"Table1" );
Repeater1.DataSource = ds.Tables["Table1"].DefaultView;
Repeater1.DataBind();
MyConnection.Close(); }
---------------
将对象引用设置到对象的实例。
说明: 执行当前 Web 请求期间,出现未处理的异常。请检查堆栈跟踪信息,以了解有关该错误以及代码中导致错误的出处的详细信息。
异常详细信息: System.NullReferenceException: 未将对象引用设置到对象的实例。
源错误:
行 33: if (Session["com_uname"]==null||Session["com_uname"].ToString()=="")
行 34: {
行 35: HyperLink1.Visible=false;
行 36: HyperLink2.Visible=false;
行 37: }
去掉 判断SESSION那段IF ELSE 就正常显示 但是HyperLink1.Visible效果没有??????????????????
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protected HyperLink Hyperlink1;
protected HyperLink Hyperlink2;
protected System.Web.UI.WebControls.HyperLink HyperLink2;
protected System.Web.UI.WebControls.Repeater Repeater1;
定义了!
这一行错了,因为当Session为空时,是Tostring()方法是错误的!!!!
try {
if(Session["com_uname"].ToString()=="") {
HyperLink1.Visible=false;
}
}
catch(Exception) {
// Session["com_uname"] is null or is a invalid object
HyperLink1.Visible=false;
}
这句是错的,必须分开
if(Session["com_uname"]==null)
{
}
else if (Session["com_uname"].ToString()=="")
{
}
else
{
}
如果Session["com_uname"]==null成立,就直接返回true,而不会再去判断Session["com_uname"].ToString()==""了,也就不存在null调用tostring()方法的错误了
这句话就知道问题了,跟踪下,肯定哪个地方有NULL值出现
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Data.SqlClient;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Configuration;namespace job
{
/// <summary>
/// person 的摘要说明。
/// </summary>
public class person : System.Web.UI.Page
{
protected System.Web.UI.WebControls.HyperLink HyperLink1;
protected System.Web.UI.WebControls.HyperLink HyperLink2;
protected System.Web.UI.WebControls.Repeater Repeater1;
private void Page_Load(object sender, System.EventArgs e)
{
string newsid = Request.QueryString["uname"].ToString().Trim();
if (Session["com_uname"]==null||Session["com_uname"].ToString()=="") {
HyperLink1.Visible=false;
HyperLink2.Visible=false;
}
else
{
HyperLink1.Visible=true;
HyperLink2.Visible=true;
HyperLink1.NavigateUrl="company1/addfav.aspx?id="+newsid;
HyperLink2.NavigateUrl="company1/MAIL_SEND.aspx?reid="+newsid;
}
SqlConnection MyConnection =new SqlConnection(ConfigurationSettings.AppSettings["cnFriends.ConnectionString"]);
string strSel1 = "UPDATE person SET click=click+1 WHERE uname='"+newsid+"'";
SqlCommand myCommand= new SqlCommand("proc_per_list",MyConnection);
myCommand.CommandType=CommandType.StoredProcedure;
SqlParameter uid=new SqlParameter("@uname",SqlDbType.VarChar,10);
uid.Value=newsid;
myCommand.Parameters.Add(uid); SqlDataAdapter myAdapter = new SqlDataAdapter(myCommand);
SqlCommand myCommand1= new SqlCommand(strSel1,MyConnection);
MyConnection.Open();
myCommand1.ExecuteNonQuery();
myCommand.ExecuteNonQuery();
DataSet ds = new DataSet();
myAdapter.Fill( ds,"Table1" );
Repeater1.DataSource = ds.Tables["Table1"].DefaultView;
Repeater1.DataBind();
MyConnection.Close();
}
}
}-------------
<%@ Page language="c#" Codebehind="person.aspx.cs" AutoEventWireup="false" Inherits="job.person" %>
<HTML>
<HEAD>
<title></title>
<meta content="Microsoft Visual Studio .NET 7.1" name="GENERATOR">
<meta http-equiv="Content-Type" content="text/html; charset=gb2312">
<meta content="C#" name="CODE_LANGUAGE">
<meta content="JavaScript" name="vs_defaultClientScript">
<LINK href="images/[email protected]" type="text/css" rel="stylesheet">
</HEAD>
<BODY text="#000000" bgColor="#003366" leftMargin="0" topMargin="0">
<asp:repeater id="Repeater1" runat="server">
<ItemTemplate>
<table id="AutoNumber62" borderColor="#111111" cellSpacing="0" cellPadding="0" width="770"
align="center" bgColor="#ffffff" border="0">
<tr>
<td vAlign="top" width="768">
<table id="AutoNumber64" borderColor="#111111" cellSpacing="0" cellPadding="0" width="710"
align="center" border="0">
<tr>
<td width="100%"><IMG src="IMAGES/persons.gif" border="0"></td>
</tr>
</table>
<table id="AutoNumber65" borderColor="#111111" cellSpacing="0" cellPadding="0" width="710"
align="center" bgColor="#1168a9" border="0">
<t<td width="81" bgColor="#ffffff"></td>
<td width="629">
<table id="AutoNumber66" borderColor="#000000" cellSpacing="0" cellPadding="0" width="100%"
border="0">
<tr>
<td vAlign="top" width="100%" bgColor="#ffffff">
<table id="AutoNumber68" borderColor="#111111" cellSpacing="0" cellPadding="6" width="100%"border="0">
<tr>
<td width="50%" bgColor="#2c8ed3"><font color="#ffffff">个人基本资料:</font></td>
<td align="right" width="50%" bgColor="#2c8ed3"><font color="#ffffff">以被查看【
<%# DataBinder.Eval(Container.DataItem,"click").ToString() %>
】次</font></td>
</tr>
</table>
<table id="AutoNumber69" borderColor="#2c8ed3" cellSpacing="0" cellPadding="6" width="100%"bgColor="#d2eafb" border="1">
<tr>
<td align="right" width="16%">姓名:</td>
<td width="21%">
<%# DataBinder.Eval(Container.DataItem,"iname").ToString() %>
</td>
<td align="right" width="18%">性别:</td>
<td width="21%">
<%# DataBinder.Eval(Container.DataItem,"sex").ToString() %>
</td>
<td vAlign="middle" align="center" width="24%" rowSpan="6"><img height=149
src='<%# DataBinder.Eval(Container.DataItem,"pic").ToString() %>'
width=128 border=0>
</td>
</tr>
<tr>
<td align="right" width="16%">年龄:</td>
<td width="21%">
<%# DataBinder.Eval(Container.DataItem,"nianling").ToString() %>
</td>
<td align="right" width="18%">民族:</td>
<%# DataBinder.Eval(Container.DataItem,"mzhu").ToString() %>
</td>
</tr>
<tr>
<td align="right" width="16%">出生日期:</td>
<td width="21%">
<%# DataBinder.Eval(Container.DataItem,"bday").ToString() %>
</td>
<td align="right" width="25%">相关工作经验:</td>
<td width="25%">
<%# DataBinder.Eval(Container.DataItem,"gznum").ToString() %>
年</td>
</tr>
<tr>
<td align="right" width="25%">外语语种:</td>
<td width="25%">
<%# DataBinder.Eval(Container.DataItem,"language").ToString() %>
</td>
<td align="right" width="25%">外语水平:</td>
<td width="25%">
<%# DataBinder.Eval(Container.DataItem,"lanlevel").ToString() %>
</td>
</tr>
<tr>
<td align="right" width="25%">普通话程度:</td>
<td width="25%">
<%# DataBinder.Eval(Container.DataItem,"pthua").ToString() %>
</td>
<td align="right" width="25%">计算机能力:</td>
<td width="25%">
<%# DataBinder.Eval(Container.DataItem,"computer").ToString() %>
</td>
</tr>
<tr>
<td align="center" width="100%" colSpan="4">个人详细工作经历:</td>
</tr>
<tr>
<td width="100%" colSpan="4">
<%# DataBinder.Eval(Container.DataItem,"gzjl").ToString() %>
</td>
</tr>
</table>
<table id="AutoNumber71" borderColor="#2c8ed3" cellSpacing="0" cellPadding="6" width="100%"
bgColor="#d2eafb" border="1">
<tr>
<td width="100%" bgColor="#2c8ed3" colSpan="4"><font color="#ffffff">求职意向:</font></td>
</tr>
<tr>
<td align="right" width="20%">求职类型:</td>
<td width="34%">
<%# DataBinder.Eval(Container.DataItem,"jobtype").ToString() %>
</td>
<td align="right" width="17%">月薪要求:</td>
<td width="29%">
<%# DataBinder.Eval(Container.DataItem,"yuex").ToString() %>
</td>
</tr>
<tr>
<td align="right" width="20%">应聘职位名称1:</td>
<td width="34%">
<%# DataBinder.Eval(Container.DataItem,"jobs").ToString() %>
</td>
<td align="right" width="17%">应聘职位名称2:</td>
<td width="29%">
<%# DataBinder.Eval(Container.DataItem,"job1").ToString() %>
</td>
</tr>
</tr>
</table>
<table id="AutoNumber72" borderColor="#111111" cellSpacing="0" cellPadding="12" width="100%"border="0">
<tr>
<td align="center">
<asp:HyperLink id="HyperLink1" runat="server" ImageUrl="IMAGES/jl1.gif">HyperLink</asp:HyperLink></td>
<td align="center">
<asp:HyperLink id="HyperLink2" runat="server" ImageUrl="IMAGES/jl3.gif">HyperLink</asp:HyperLink></td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
</table>
</td>
</tr>
<tr>
<td width="81" bgColor="#ffffff"></td>
<td width="629" bgColor="#ffffff"></td>
</tr>
</table>
</ItemTemplate>
</asp:repeater>
</BODY>
</HTML>
????????????????????????