C# - How To Find Object In NHibernate/castle Activerecord Session
Aug 27, 2010
I am getting the following error in an Asp.Net Castle ActiveRecord app when trying to update an object:
"a different object with the same identifier value was already associated with the session"
I've looked up and down my code to see where else the object might have been created but I'm not seeing it. This is baffling as I have the exact same code on another page that works fine on updates
Now I'm thinking of trying to see where this other object is in the Session and either kill it or find out how it got into the session. How can I find this object?
[Update]
Ok, I finally found where the object is being called. However, I would still like to know how to find objects in the session for future reference.
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Jun 15, 2010
I've got all of my ASP.NET requests wrapped in a Session and a Transaction that gets commited only at the very end of the request. At some point during execution of the request, I would like to insert an object and make it visible to other potential threads - i.e. split the insertion into a new transaction, commit that transaction, and move on. The reason is that the request in question hits an API that then chain hits another one of my pages (near-synchronously) to let me know that it processed, and thus double submits a transaction record, because the original request had not yet finished, and thus not committed the transaction record.
So I've tried wrapping the insertion code with a new SessionScope, TransactionScope(TransactionMode.New), combination of both, flushing everything manually, etc. However, when I call Refresh on the object I'm still getting the old object state. Here's some code sample for what I'm seeing:
Post outsidePost = Post.Find(id); // status of this post is Status.Old
using (TransactionScope transaction = new TransactionScope(TransactionMode.New))
{
Post p = Post.Find(id);
p.Status = Status.New; // new status set here
p.Update();
SessionScope.Current.Flush();
transaction.Flush();
transaction.VoteCommit();
}
outsidePost.Refresh();
// refresh doesn't get the new status, status is still Status.Old
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Mar 23, 2010
I'm trying to use Castle ActiveRecord with c#.
I'm moving data from an old database (FF2) to spatiaLite (sqLite)
The first few tables are updated without any problems. Then every table after gives and error
when I try to save. None of these tables have composite primary IDs.
SnapFarms tbl = new SnapFarms();
.... loop
if (theField.Equals("clientid")) tbl.operationId = getString(val, "{000-000}"); else
if (theField.Equals("farmid")) tbl.farmId = getString(val,"{000-000}"); else
if (theField.Equals("farmname")) tbl.farmName = getString(val,"Missing"); else ...
... end loop
tbl.Save();
exception message::Index was out of range. Must be non-negative and less than the size of the collection.
Parameter name: index
There is no Index column so what is going on?
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May 10, 2010
I am trying to configure NHibernate on my console application in which I am trying to map an Employee class to a table Employee.I am getting below exception which I have no clue:
Class:
class Employee
{
public int id;
public string name;
[code]...
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Nov 28, 2010
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Sep 20, 2010
I have NHibernate sessions cached in the ASP.NET session.
I came across a situation where a user edited an object so it's in their first level cache in the ISession. Another user then edited the same object.
At this point User1 still sees their original version of their edits where as User2 sees the correct state of the object?
What is the correct way to handle this without manually calling session.Refresh(myObj) explicitly for every single object all the time?
I also have a 2nd level cache enabled. For NHibernate Long Session should I just disable the first level cache entirely?
Edit: Adding some more terminology to what I'm looking to achieve from 10.4.1. Long session with automatic versioning the end of this section concludes with
As the ISession is also the (mandatory) first-level cache and contains all loaded objects, we can propably use this strategy only for a few request/response cycles. This is indeed recommended, as the ISession will soon also have stale data.
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Jun 7, 2010
I have a situation where I have 3 tables: StockItem, Office and StockItemPrice. The price for each StockItem can be different for each Office.
StockItem(
D
Name
)
Office(
ID
Name
)
[code]...
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Nov 15, 2010
In the VS2005 environment, when I test my session to make sure the page redirects to the main page (itself) if the session is null, it works. There is no error.
The function I use for this is:
[code]....
However, when it is in the production environment in IIS 6.0, when the session has timed out, and I then do a postback by doing some slider control, I see the page reload but immediately thereafter, it throws a Server Error exception of : Object reference not set to an instance of object.
Looking at the stack trace, the event occured:
AJAXEnabledWebApplication1._Default.Slider1_TextChanged(Object sender, EventArgs e)
however, why is it that the Slider1_TextChanged event fired even even after during page_load, the page was told to do a response.direct ?? shouldn't the entire page have gone through a full-page refresh life cycle ? why did it continue on to attempt to raise the Slider1_TextChanged event?
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May 7, 2015
I am getting object refernce error at line:if (Session["Tax"].ToString() == "9")
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{
if (Session["Tax"].ToString() == "9")
{
lblTax.Text = Session["Tax"].ToString();
}
else
{
lblTax.Text = "0";
}
}
Is anything wrong I have done?
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Jul 20, 2010
I am confused about how to reference objects in session, how to update, and copy.
if I create
MyObject obj = new Object ();
then
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MyObject temp = (MyObject)Session["object"];
If i change something on temp, will the object in session be updated? do i need to follow changes with Session["object"] = temp?
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Oct 7, 2010
I want to be able to persist data across a session but do this outside of the built-in session state object. Why is a long story that I will not go into here. I just need to know where I can put data other than in the session object that will persist across the specific session.
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Dec 20, 2010
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I created a new page that also calls the initialize() method. If I visit that page once, then the rest of the site works. If I visit it a second time, I get an exception stating that the Initialize() method can only be called once.
I've tried modifying the web.config and resetting the application pool to force Application_Start to run.
This only happens in production; dev, my stage, and client stage are fine. Production is the only load-balanced environment--I'm not sure if that comes into play.
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Apr 19, 2010
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DAO.CanAddCategory(category);
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Object reference not set to an instance of an object.
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I'm setting the session in the Default page with this code :
Session("cne") = cne.Text
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Nov 7, 2010
public void Add(IDataProvider provider){
var key=KeyValue();
if(key==null){
var newKey=_repo.Add(this,provider);
this.SetKeyValue(newKey);
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_repo.Add(this,provider); //NullReferenceException was unhandled by user code
[Code]....
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I am getting thid error 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 18:
Line 19: <%
Line 20: string thedate = Session["indate"].ToString();////;;;;????
Line 21: Response.Write("Starting SAS");
Line 22: try
Source File: c:Documents and SettingsAdministratorMy DocumentsVisual Studio 2008WebSitesWebSite1SASrun.aspx
upload.aspx
<%@ Page language="c#"Debug =true Codebehind="upload.aspx.cs" AutoEventWireup="false"
Inherits="Stardeveloper.UploadAccess.UploadForm" %>
<script runat="server">
void Button2_Click(object sender, EventArgs e)
{
Session["indate"] = Request["txtDate"];
Response.Redirect("SASrun.aspx");
}
</script>
<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN" >
<html>
<head>
</head>
<body>
<body style="background:#80B584">
<form runat=server>
<a href="default.aspx"><b>Main Page</b></a> · Upload Files
<div id="message" runat="server" />
<table align="left" border="0" cellspacing="0" cellpadding="3">
<p style="font-family:arial;color:White;font-size:20px;">Upload new files.</p>
<tr><td><b>MTMDetailed:</b></td><td><input type="file" class="stdInput" name="uploaded_file1"></td></tr>
<tr><td><b>File TRI_FP:</b></td><td><input type="file" class="stdInput" name="uploaded_file2"></td></tr>
<tr><td><b>indate :</b></td><td><input type="text"id="txtDate" name="inputdate"/></td></tr>
<tr><td align="right"><input type="submit" value="Submit"></td></tr>
<asp:Button id="Button2" runat="server" Text="Submit" onClick="Button2_Click" />
</table>
</form>
</body>
</html>
This is part of the code where error is coming from................
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[Code]....
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[Code]....
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/* Create polling SP */
..more sql
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