Object reference not set to an instance of an object

[Valeria75_bis]

Ciao, ottengo l'errore indicato nel caricamento di un file ... eppure il file esiste nella cartella e ho provato anche a mettere un path completo... dove sbaglio???

Object reference not set to an instance of an object.


Object reference not set to an instance of an object.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.

Exception Details: System.NullReferenceException: Object reference not set to an instance of an object.

Source Error:


Line 17: private void Page_Load(object sender, System.EventArgs e)
Line 18: {
Line 19: NavBar1.SiteMapXmlFile = "navData.xml";
Line 20:
Line 21: }

[alka]

Forse dovresti indicare qualche informazione in più: i controlli della pagina, il codice, ...

[Valeria75_bis]

Cos'altro potrebbe servire?? Perchè in quella pagina ho solo l'istruzione

NavBar1.SiteMapXmlFile = "navData.xml"; nel load e basta

[alka]

Quell'oggetto NavBar1 è definito? A cosa corrisponde?
Se esegui il debug dell'applicazione Web, soffermandoti con il cursore sull'identificatore ottieni un riferimento impostato o risulta Nothing?

[Valeria75_bis]

In effetti in debug ho null in prossimità dell'oggetto... eppure in un altro progetto uso la stessa logica e non ho problemi... dove sto sbagliando?? (è un po' difficile capirlo???)

[djciko]

beh, dovresti fornire un po' di informazioni in piu' (correttezza del percorso del file, permessi, codice di contorno a quell'istruzione etc etc)

Posta le due pagine (quella del progetto funzionante e quella non)

[Valeria75_bis]

Faccio un breve riassunto:

se nel load metto

NavBar1 = new Component.Web.UI.NavBar();
NavBar1.SiteMap....

non ottengo errori

ma in questo modo l'oggetto NavBar1 definito nell'HTML non viene preso in considerazione.... io invece dovrei mantenere tutte le caratteristiche impostate nell'HTML

eppure ripeto... la stessa logica (senza il New) in un altro progetto .NET 1.1 (questo è 2.0 non so se può essere il motivo) non mi da problemi

Grazie

[Valeria75_bis]

Mia nuova applicazione


Code Behind

using System;
using System.Data;
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 Detail_master : System.Web.UI.MasterPage
{
//protected ComponentArt.Web.UI.NavBar NavBar2;
protected System.Web.UI.WebControls.Calendar Calendar1;

private void Page_Load(object sender, System.EventArgs e)
{
//NavBar1 = new ComponentArt.Web.UI.NavBar();
NavBar1.SiteMapXmlFile = "navData.xml";
}
}




HTML

<%@ Master Language="C#" CodeFile="Detail.master.cs" Inherits="Detail_master" %>
<%@ Register TagPrefix="ComponentArt" Namespace="ComponentArt.Web.UI" Assembly="ComponentArt.Web.UI" %>
<%@ Register TagPrefix="demos" TagName="Header" Src="~/common/page_fragments/header.ascx"%>
<%@ Register TagPrefix="demos" TagName="Footer" Src="~/common/page_fragments/footer.ascx"%>
<%@ Register TagPrefix="demos" TagName="About" Src="~/common/page_fragments/about.ascx"%>


...



<COMPONENTART:NAVBAR id="NavBar1" runat="server" Width="170px" Height="333" CssClass="NavBar" DefaultItemLookID="TopItemLook"
ExpandSinglePath="true" FullExpand="true" ImagesBaseUrl="images/Menu/" ShowScrollBar="false" ExpandTransition="Fade" ExpandDuration="200"
CollapseTransition="Fade" CollapseDuration="200" ScrollUpImageUrl="scrollup.gif" ScrollUpHoverImageUrl="scrollup_hover.gif" ScrollUpActiveImageUrl="scrollup_active.gif"
ScrollDownImageUrl="scrolldown.gif" ScrollDownHoverImageUrl="scrolldown_hover.gif" ScrollDownActiveImageUrl="scrolldown_active.gif" ScrollUpImageWidth="16" ScrollUpImageHeight="16"
ScrollDownImageWidth="16" ScrollDownImageHeight="16">
<ItemLooks>
<componentart:ItemLook HoverCssClass="TopItemHover" LeftIconHeight="24px" LeftIconUrl="top_folder.gif"
LabelPaddingLeft="15px" LeftIconWidth="30px" LookId="TopItemLook" CssClass="TopItem"></componentart:ItemLook>
<componentart:ItemLook HoverCssClass="Level2ItemHover" LeftIconHeight="16px" LabelPaddingLeft="10px" LeftIconWidth="16px"
LookId="Level2ItemLook" CssClass="Level2Item"></componentart:ItemLook>
<componentart:ItemLook LookId="EmptyLook" CssClass="Empty"></componentart:ItemLook>
</ItemLooks>
<Templates>

<componentart:NavigationCustomTemplate ID="FolderListTemplate">
<Template>
<ComponentArt:TreeView id="TreeView1" runat="server" Width="194" Height="166" CssClass="TreeView" SiteMapXmlFile="treeData.xml"
EnableViewState="false" LineImagesFolderUrl="images/Menu/lines/" ShowLines="false" LeafNodeImageUrl="images/Menu/folder.gif"
ParentNodeImageUrl="images/Menu/folders.gif" NodeLabelPadding="3" ItemSpacing="3" NodeIndent="16" ExpandImageUrl="images/Menu/col.gif"
CollapseImageUrl="images/Menu/exp.gif" ExpandCollapseImageHeight="15" ExpandCollapseImageWidth="15"
DefaultImageHeight="16" DefaultImageWidth="16" NodeEditCssClass="NodeEdit" SelectedNodeCssClass="SelectedTreeNode"
HoverNodeCssClass="HoverTreeNode" NodeCssClass="TreeNode" KeyboardEnabled="true" NodeEditingEnabled="true"
DragAndDropEnabled="true" AutoScroll="true">
<TEMPLATES>
<ComponentArt:NavigationCustomTemplate id="UnreadItemsTemplate">
<TEMPLATE>
<DIV style="PADDING-LEFT: 1px"><%# DataBinder.Eval(Container.DataItem, "Text") %><FONT color="blue">(<%# Container.Attributes["UnreadItems"] %>)</FONT>
</DIV>
</TEMPLATE>
</ComponentArt:NavigationCustomTemplate>
<ComponentArt:NavigationCustomTemplate id="InfoItemsTemplate">
<TEMPLATE>

<%# DataBinder.Eval(Container.DataItem, "Text") %>
<FONT color="green">[<%# Container.Attributes["InfoItems"] %>]</FONT>
</TEMPLATE>
</ComponentArt:NavigationCustomTemplate>
</TEMPLATES>
</ComponentArt:TreeView>
</Template>
</componentart:NavigationCustomTemplate>
</Templates>
</COMPONENTART:NAVBAR>






Mentre il progetto originale aveva:

Una pagina MenuSx

using System;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;

/// <summary>
/// Summary description for MenuSx.
/// </summary>
public class MenuSx : System.Web.UI.UserControl
{
protected ComponentArt.Web.UI.NavBar NavBar1;
protected System.Web.UI.WebControls.Calendar Calendar1;

private void Page_Load(object sender, System.EventArgs e)
{

NavBar1.SiteMapXmlFile = "navData.xml";

}

....



<%@ Control Language="c#" AutoEventWireup="false" Codebehind="MenuSx.ascx.cs" Inherits="AppTestCM.Template.MenuSx" TargetSchema="http://schemas.microsoft.com/intellisense/ie5"%>
<%@ Register TagPrefix="ComponentArt" Namespace="ComponentArt.Web.UI" Assembly="ComponentArt.Web.UI" %>
<%@ Register TagPrefix="demos" TagName="Header" Src="~/common/page_fragments/header.ascx"%>
<%@ Register TagPrefix="demos" TagName="Footer" Src="~/common/page_fragments/footer.ascx"%>
<%@ Register TagPrefix="demos" TagName="About" Src="~/common/page_fragments/about.ascx"%>
<div class="DemoArea" style="WIDTH: 150px; HEIGHT: 390px" align="center">
<COMPONENTART:NAVBAR id="NavBar1" runat="server" Width="170px" Height="333" CssClass="NavBar" DefaultItemLookID="TopItemLook"
ExpandSinglePath="true" FullExpand="true" ImagesBaseUrl="images/Menu/" ShowScrollBar="false" ExpandTransition="Fade" ExpandDuration="200"
CollapseTransition="Fade" CollapseDuration="200" ScrollUpImageUrl="scrollup.gif" ScrollUpHoverImageUrl="scrollup_hover.gif" ScrollUpActiveImageUrl="scrollup_active.gif"
ScrollDownImageUrl="scrolldown.gif" ScrollDownHoverImageUrl="scrolldown_hover.gif" ScrollDownActiveImageUrl="scrolldown_active.gif" ScrollUpImageWidth="16" ScrollUpImageHeight="16"
ScrollDownImageWidth="16" ScrollDownImageHeight="16">
<ItemLooks>
<componentart:ItemLook HoverCssClass="TopItemHover" LeftIconHeight="24px" LeftIconUrl="top_folder.gif"
LabelPaddingLeft="15px" LeftIconWidth="30px" LookId="TopItemLook" CssClass="TopItem"></componentart:ItemLook>
<componentart:ItemLook HoverCssClass="Level2ItemHover" LeftIconHeight="16px" LabelPaddingLeft="10px" LeftIconWidth="16px"
LookId="Level2ItemLook" CssClass="Level2Item"></componentart:ItemLook>
<componentart:ItemLook LookId="EmptyLook" CssClass="Empty"></componentart:ItemLook>
</ItemLooks>
<Templates>
<componentart:NavigationCustomTemplate ID="CalendarTemplate">
<Template>
<TABLE cellSpacing="0" cellPadding="0" width="100%" border="0">
<TR>
<TD style="PADDING-TOP: 2px">
<asp:calendar id=Calendar1 runat="server" NextMonthText="<img src=images/Menu/cal_nextMonth.gif border=0>" PrevMonthText="<img src=images/Menu/cal_prevMonth.gif border=0>" width="100%" selecteddaystyle-backcolor="silver" font-names="tahoma" font-size="11px" DayNameFormat="FirstLetter" SelectedDate="<%#DateTime.Today%>">
<TitleStyle BackColor="#D7D7E5"></TitleStyle>
<SelectedDayStyle BackColor="#FBE694" ForeColor="#000000" BorderWidth="1px" BorderColor="#BB5503"
Font-Bold="true"></SelectedDayStyle>
<DayHeaderStyle Font-Bold="True"></DayHeaderStyle>
<OtherMonthDayStyle ForeColor="#999999"></OtherMonthDayStyle>
</asp:calendar></TD>
</TR>
</TABLE>
</Template>
</componentart:NavigationCustomTemplate>
<componentart:NavigationCustomTemplate ID="FolderListTemplate">
<Template>
<ComponentArt:TreeView id="TreeView1" runat="server" Width="194" Height="166" CssClass="TreeView" SiteMapXmlFile="treeData.xml"
EnableViewState="false" LineImagesFolderUrl="images/Menu/lines/" ShowLines="false" LeafNodeImageUrl="images/Menu/folder.gif"
ParentNodeImageUrl="images/Menu/folders.gif" NodeLabelPadding="3" ItemSpacing="3" NodeIndent="16" ExpandImageUrl="images/Menu/col.gif"
CollapseImageUrl="images/Menu/exp.gif" ExpandCollapseImageHeight="15" ExpandCollapseImageWidth="15"
DefaultImageHeight="16" DefaultImageWidth="16" NodeEditCssClass="NodeEdit" SelectedNodeCssClass="SelectedTreeNode"
HoverNodeCssClass="HoverTreeNode" NodeCssClass="TreeNode" KeyboardEnabled="true" NodeEditingEnabled="true"
DragAndDropEnabled="true" AutoScroll="true">
<TEMPLATES>
<ComponentArt:NavigationCustomTemplate id="UnreadItemsTemplate">
<TEMPLATE>
<DIV style="PADDING-LEFT: 1px"><%# DataBinder.Eval(Container.DataItem, "Text") %><FONT color="blue">(<%# Container.Attributes["UnreadItems"] %>)</FONT>
</DIV>
</TEMPLATE>
</ComponentArt:NavigationCustomTemplate>
<ComponentArt:NavigationCustomTemplate id="InfoItemsTemplate">
<TEMPLATE>

<%# DataBinder.Eval(Container.DataItem, "Text") %>
<FONT color="green">[<%# Container.Attributes["InfoItems"] %>]</FONT>
</TEMPLATE>
</ComponentArt:NavigationCustomTemplate>
</TEMPLATES>
</ComponentArt:TreeView>
</Template>
</componentart:NavigationCustomTemplate>
</Templates>
</COMPONENTART:NAVBAR></div>




Inclusa poi nelle mie pagine:



<%@ Register TagPrefix="NX" TagName="Menu" Src="Template/MenuSx.ascx" %>


....

<TD vAlign="bottom" height="27"><NX:MENUTOP id="MenuTop" runat="server"></NX:MENUTOP></TD>

[Valeria75_bis]

Ho capito il problema


praticamente nella mia pagina ho Detail.master ho:




<form id="form1" runat="server">

<div class="header">

</div>

<asp:contentplaceholder id="Main" runat="server" >
<div id="home" class="page" style="left: 0px; top: 0px">
<div id="content" style="text-align: left">
</div>
</div>
</asp:contentplaceholder>

<div class="footerbg">
<div class="footer">
<asp:menu id="menub" runat="server"
datasourceid="SiteMapDataSource1"
cssclass="menub"
orientation="Horizontal"
maximumdynamicdisplaylevels="0"
skiplinktext=""
staticdisplaylevels="2" />
POLYHEDRON Copyright &copy; 2006 Skill Risorse Umane</div>
</div>

<asp:sitemapdatasource id="SiteMapDataSource1" runat="server" startingnodeoffset="0" />

</form>


Mentre nelle mie pagine ho




<%@ Page Language="C#" MasterPageFile="~/Detail.master" Title="POLYHEDRON | Links"
CodeFile="Links.aspx.cs" Inherits="Links_aspx" %>
<asp:content id="Content1" contentplaceholderid="Main" runat="server">
<div id="links" contenteditable="true" style="left: 0px; top: 38px">
<div id="content" style="text-align: center">






<table id="Table3" align="center" border="0" cellpadding="0" cellspacing="0" height="100%"
style="width: 500px; text-align: left">
<tbody>
<tr>
<td height="0" valign="bottom">
....
</td>
</tr>
</tbody>
</table>
</div>
</div>

</asp:content>


Quindi quando inserisco un Menu nel Master viene sovrapposto dal content delle varie pagine (e di conseguenza non lo vedo)

Ho fatto alcune prove ma non riesco a:

lasciare un'area fissa a SX (nel master), dove inserirò il menu
nelle varie pagine utilizzare solo un'area di Dx, lasciando quindi visibile l'area per il Menu

Grazie per l'aiuto

[Valeria75_bis]

Nessun aiutino su come risolvere questo problema master/detail???