未将对象引用设置到对象的实例

未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 34:         Session.Timeout = 1;
行 35:         Application.Lock();
行 36:         Application["tatol"] = (int)Application["tatol"] + 1;
行 37:         Application["online"] =(int)Application["online"] + 1;
行 38:         Application.UnLock();
 源文件: f:\留言板\sixibook\Global.asax    行: 36 堆栈跟踪: 
[NullReferenceException: 未将对象引用设置到对象的实例。]
   ASP.global_asax.Session_Start(Object sender, EventArgs e) in f:\留言板\sixibook\Global.asax:36
   System.Web.SessionState.SessionStateModule.RaiseOnStart(EventArgs e) +8779824
   System.Web.SessionState.SessionStateModule.CompleteAcquireState() +237
   System.Web.SessionState.SessionStateModule.BeginAcquireState(Object source, EventArgs e, AsyncCallback cb, Object extraData) +504
   System.Web.AsyncEventExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +66
   System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155
还有一个
分析器错误 
说明: 在分析向此请求提供服务所需资源时出错。请检查下列特定分析错误详细信息并适当地修改源文件。 分析器错误消息: 服务器标记的格式不正确。源错误: 
行 159:                       <div align="right">
行 160:                       
行 161:                        <asp:LinkButton ID="lbtnreply" runat="server" Style="position: relative" CommandArgument="<%# DataBinder.Eval(Container.DataItem,"ID","{0}") %>" OnCommand="lbtnreply_Command">回复留言</asp:LinkButton>
行 162:                        <asp:LinkButton ID="lbtndel" runat="server" Style="position: relative" CommandArgument="<%# DataBinder.Eval(Container.DataItem,"ID","{0}") %>" OnCommand="lbtndel_Command">删除留言</asp:LinkButton></div>
行 163:                        <hr />
 源文件: /sixibook/index.aspx    行: 161 
--------------------------------------------------------------------------------
版本信息: Microsoft .NET Framework 版本:2.0.50727.3607; ASP.NET 版本:2.0.50727.3082 谢谢各位了 我新手   用的是vs 2005
 

解决方案 »

  1.   


    DataBinder.Eval(Container.DataItem, fieldname)
      

  2.   

    Application["tatol"] Application["online"] 初始化了么
      

  3.   

    DataBinder。eval（两个参数就好了吧！呵呵！）
      

  4.   

    加上这些
    protected void Application_Start(object sender, EventArgs e)
    {
       Application["tatol"] = 0;
       Application["online"] =0;
    }
      

  5.   

    DataBinder.Eval(Container.DataItem,"ID","{0}") %>"   后面不需要{0}把
      

  6.   

    Application["tatol"] Application["online"] 能取到值吗？
      

  7.   

    <%@ Page Language="C#" AutoEventWireup="true" CodeFile="index.aspx.cs" Inherits="index" %><%@ Register Assembly="EeekSoft.Web.PopupWin" Namespace="EeekSoft.Web" TagPrefix="cc1" %><%@ Register Src="header.ascx" TagName="header" TagPrefix="uc1" %>
    <%@ Register Src="gui.ascx" TagName="gui" TagPrefix="uc2" %>
    <%@ Register Src="foot.ascx" TagName="foot" TagPrefix="uc3" %><!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml" >
    <head runat="server">
        <title>xuejun_200501留言板</title>
    </head>
    <body background="image/1.jpg">
    <script type="text/javascript" >
    <!--
    var no = 30;
    var speed = 1;
    var ns4up = (document.layers) ? 1 : 0;
    var ie4up = (document.all) ? 1 : 0;
    var s, x, y, sn, cs;
    var a, r, cx, cy;
    var i, doc_width = 800, doc_height = 600;
    if (ns4up) {
    doc_width = self.innerWidth;
    doc_height = self.innerHeight;
    }
    else
    if (ie4up) {
    doc_width = document.body.clientWidth;
    doc_height = document.body.clientHeight;
    }
    x = new Array();
    y = new Array();
    r = new Array();
    cx = new Array();
    cy = new Array();
    s = 8;
    for (i = 0; i < no; ++ i) {  
    initRain();
    if (ns4up) {
    if (i == 0) {
    document.write("<layer name=\"dot"+ i +"\" left=\"1\" ");
    document.write("top=\"1\" visibility=\"show\"><font color=\"bule\">");
    document.write("○</font></layer>");
    }
    else {
    document.write("<layer name=\"dot"+ i +"\" left=\"1\" ");
    document.write("top=\"1\" visibility=\"show\"><font color=\"black\">");
    document.write("○</font></layer>");
       }
    }
    else 
    if (ie4up) {
    if (i == 0) {
    document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
    document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
    document.write("visible; TOP: 15px; LEFT: 15px;\"><font color=\"red\">");
    document.write("○</font></div>");
    }
    else {
    document.write("<div id=\"dot"+ i +"\" style=\"POSITION: ");
    document.write("absolute; Z-INDEX: "+ i +"; VISIBILITY: ");
    document.write("visible; TOP: 12px; LEFT: 12px;\"><font color=\"green\">");
    document.write("○</font></div>");
          }
       }
    }
    function initRain() {
    a = 6;
    r[i] = 1;
    sn = Math.sin(a);
    cs = Math.cos(a);
    cx[i] = Math.random() * doc_width + 1;
    cy[i] = Math.random() * doc_height + 1;
    x[i] = r[i] * sn + cx[i];
    y[i] = cy[i];
    }function makeRain() {
    r[i] = 1;
    cx[i] = Math.random() * doc_width + 1;
    cy[i] = 1;
    x[i] = r[i] * sn + cx[i];
    y[i] = r[i] * cs + cy[i];
    }
    function updateRain() {
    r[i] += s;
    x[i] = r[i] * sn + cx[i];
    y[i] = r[i] * cs + cy[i];
    }
    function raindropNS() {
    for (i = 0; i < no; ++ i) {
    updateRain();
    if ((x[i] <= 1) || (x[i] >= (doc_width - 20)) || (y[i] >= (doc_height - 20))) {
    makeRain();
    doc_width = self.innerWidth;
    doc_height = self.innerHeight;
    }
    document.layers["dot"+i].top = y[i];
    document.layers["dot"+i].left = x[i];
    }
    setTimeout("raindropNS()", speed);
    }
    function raindropIE() {
    for (i = 0; i < no; ++ i) {
    updateRain();
    if ((x[i] <= 1) || (x[i] >= (doc_width - 20)) || (y[i] >= (doc_height - 20))) {
    makeRain();
    doc_width = document.body.clientWidth;
    doc_height = document.body.clientHeight;
    }
    document.all["dot"+i].style.pixelTop = y[i];
    document.all["dot"+i].style.pixelLeft = x[i];
    }
    setTimeout("raindropIE()", speed);
    }
    if (ns4up) {
    raindropNS();
    }
    else
    if (ie4up) {
    raindropIE();
    }
    -->
    </script>    <form id="form1" runat="server">
        <div>        &nbsp;<table style="left: 152px; position: relative; top: -23px; height: 213px; cursor: move; clear: none;">
                <tr>
                    <td style="width: 908px; height: 116px">
                        <uc1:header ID="Header1" runat="server"/>
                    </td>
                </tr>
                <tr>
                    <td style="height: 3px; clear: none; vertical-align: top; position: relative; text-align: center;">
                        &nbsp; &nbsp;&nbsp;
                        <uc2:gui ID="Gui1" runat="server"/>
                    </td>
                </tr>
                <tr>
                    <td style="height: 213px" align="center">
                        <asp:DataList ID="DataList1" runat="server" style="position: relative; left: 0px; top: 3px;" Height="3px" Width="762px" CellPadding="4" ForeColor="#333333" OnItemDataBound="DataList1_ItemDataBound">
                             <ItemTemplate>
                            <div  align="left">
                            <img alt="aa" src="image/<%# DataBinder.Eval(Container.DataItem,"imageAddress","{0}") %> " />
                          
                           留言者：<%# DataBinder.Eval(Container.DataItem,"userName","{0}") %>
                           QQ：<%# DataBinder.Eval(Container.DataItem,"QQ","{0}") %>
                           留言时间：<%# DataBinder.Eval(Container.DataItem,"postTime","{0:d}") %>
                           </div>
                           <div align="right">
                           
                            <asp:LinkButton ID="lbtnreply" runat="server" Style="position: relative" CommandArgument="<%# DataBinder.Eval(Container.DataItem,"ID","{0}") %>" OnCommand="lbtnreply_Command">回复留言</asp:LinkButton>
                            <asp:LinkButton ID="lbtndel" runat="server" Style="position: relative" CommandArgument="<%# DataBinder.Eval(Container.DataItem,"ID","{0}") %>" OnCommand="lbtndel_Command">删除留言</asp:LinkButton></div>
                            <hr />
                           <font color="#3399cc">
                           <div align="left">
                           留言信息：<%# DataBinder.Eval(Container.DataItem,"Content") %>
                           </font>
                           <hr />
                           <font color="#cc0099">
                           回复信息：<%# DataBinder.Eval(Container.DataItem,"Reply") %>
                           </font></DIV>
                        </ItemTemplate> 
                                
                            <FooterStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
                            <SelectedItemStyle BackColor="#FFCC66" Font-Bold="True" ForeColor="Navy" />
                            <AlternatingItemStyle BackColor="White" />
                            <ItemStyle BackColor="#FFFBD6" ForeColor="#333333" />
                            <HeaderStyle BackColor="#990000" Font-Bold="True" ForeColor="White" />
                            <SeparatorTemplate>
                                <hr />
                            </SeparatorTemplate>
                        </asp:DataList>
                        <div style="z-index: 101; left: 7px; vertical-align: bottom; width: 816px;
                            top: 18px; height: 30px; clear: none; position: relative;">
                           当前页:<asp:Label ID="Label1" runat="server" Text="1"></asp:Label>
                            <asp:Button ID="Button1" runat="server" Text="上一页" OnClick="Button1_Click" />
                            <asp:Button ID="Button2" runat="server" Text="下一页" OnClick="Button2_Click" />
                            <asp:Button ID="Button3" runat="server" Text="首页" OnClick="Button3_Click" />
                            <asp:Button ID="Button4" runat="server" Text="尾页" OnClick="Button4_Click" />
                            <asp:Label ID="Label2" runat="server" Text="Label"></asp:Label></div>
                    </td>
                </tr>
                <tr>
                    <td style="height: 8px; vertical-align: bottom; text-align: center; padding-top: 1px;">
                        &nbsp;<uc3:foot ID="Foot1" runat="server" />
                    </td>
                </tr>
            </table>
        
        </div>
            <cc1:PopupWin ID="PopupWin1" runat="server" Message="" Title="系统消息" />
        </form>
    </body>
    </html>
      

  8.   

    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;public partial class index : System.Web.UI.Page
    {
        protected void Page_Load(object sender, EventArgs e)
        {
            if (Session["admin"] == null)//判断用户身份
            {
                this.PopupWin1.Message = "欢迎访问！你的身份是访客－－－－你的ＩＰ" + Request.UserHostAddress;
            }
            else
            {
                this.PopupWin1.Message = "欢迎访问！你的身份是管理员－－－你的ＩＰ" + Request.UserHostAddress;
            }        if (!this.IsPostBack)
            {
                this.databindlist();//绑定数据
            }    }
        
        public void databindlist()
        {
            int curpage = Convert.ToInt32(this.Label1.Text);
            SqlConnection con = DB.createcon();
            con.Open();
            SqlDataAdapter sda = new SqlDataAdapter();
            sda.SelectCommand = new SqlCommand("select * from guest order by ID DESC", con);
            DataSet ds = new DataSet();
            sda.Fill(ds, "guest");
            System.Web.UI.WebControls.PagedDataSource ps = new PagedDataSource();
            ps.DataSource = ds.Tables["guest"].DefaultView;
            ps.AllowPaging = true;
            ps.PageSize = 5;
            ps.CurrentPageIndex = curpage - 1;
            this.Button1.Enabled = true;
            this.Button2.Enabled = true;        if (curpage == 1)
            {
                this.Button1.Enabled = false;
            }
            if (curpage == ps.PageCount)
            {
                this.Button2.Enabled = false;
            }
            this.DataList1.DataSource = ps;
            this.DataList1.DataBind();        this.DataList1.DataSource = ps;
            this.DataList1.DataBind();
            //获取总留言条数
            DB.pagecount = Convert.ToString(ps.PageCount);
            SqlCommand cmd = new SqlCommand("select count(*) from guest", con);
            this.Label2.Text = "总留言条数：" + Convert.ToString(cmd.ExecuteScalar()) + "条";
            con.Close();    }
        protected void Button1_Click(object sender, EventArgs e)
        {
            this.Label1.Text = Convert.ToString(Convert.ToInt32(this.Label1.Text) - 1);
            this.databindlist();
        }
        protected void Button2_Click(object sender, EventArgs e)
        {
            this.Label1.Text = Convert.ToString(Convert.ToInt32(this.Label1.Text) + 1);
            this.databindlist();
        }
        protected void Button3_Click(object sender, EventArgs e)
        {
            this.Label1.Text = "1";
            this.databindlist();
        }
        protected void Button4_Click(object sender, EventArgs e)
        {
            this.Label1.Text = DB.pagecount;
            this.databindlist();
        }    protected void lbtnreply_Command(object sender, CommandEventArgs e)
        {
            if (Session["admin"] == null)
            {
                Response.Redirect("showmes.aspx?message=对不起！只有管理员才有权删除留言！如果你是管理员！请登陆");        }
            else
            {
                Response.Redirect("Reply.aspx?guestID=" + e.CommandArgument);
            }
        }
       
        protected void DataList1_ItemDataBound(object sender, DataListItemEventArgs e)
        {
            LinkButton lkb = (LinkButton)(e.Item.FindControl("lbtndel"));
            if (lkb != null)
            {
                lkb.Attributes.Add("onclick", "return confirm('你是否删除留言？');");
            }
        }    protected void lbtndel_Command(object sender, CommandEventArgs e)
        {        if (Session["admin"] == null)
            {
                Response.Redirect("showmes.aspx?message=对不起！只有管理员才有权删除留言！如果你是管理员！请登陆");        }
            else
            {
                SqlConnection con = DB.createcon();
                con.Open();
                SqlCommand cmd = new SqlCommand("delete from guest where ID=" + e.CommandArgument, con);
                if (Convert.ToInt32(cmd.ExecuteNonQuery()) > 0)
                {
                    Response.Redirect("showmes.aspx?message=删除成功");
                }
                else
                {
                    Response.Redirect("showmes.aspx?message=删除失败");
                }
            }
        }
        
    }
      

  9.   

    这是代码 麻烦各位大侠帮我看下   “/sixibook”应用程序中的服务器错误。
    --------------------------------------------------------------------------------分析器错误 
    说明: 在分析向此请求提供服务所需资源时出错。请检查下列特定分析错误详细信息并适当地修改源文件。 分析器错误消息: 服务器标记的格式不正确。源错误: 
    行 159:                       <div align="right">
    行 160:                       
    行 161:                        <asp:LinkButton ID="lbtnreply" runat="server" Style="position: relative" CommandArgument="<%# DataBinder.Eval(Container.DataItem,"ID") %>" OnCommand="lbtnreply_Command">回复留言</asp:LinkButton>
    行 162:                        <asp:LinkButton ID="lbtndel" runat="server" Style="position: relative" CommandArgument="<%# DataBinder.Eval(Container.DataItem,"ID") %>" OnCommand="lbtndel_Command">删除留言</asp:LinkButton></div>
    行 163:                        <hr />
     源文件: /sixibook/index.aspx    行: 161 
    --------------------------------------------------------------------------------
    版本信息: Microsoft .NET Framework 版本:2.0.50727.3607; ASP.NET 版本:2.0.50727.3082 
    6楼和7楼的楼主的方法    我都试过  但是不信的啊