What could cause a stack trace like this?
Message:Object reference not set to an instance of an object.
Stack Trace:
at System.Data.Dat aView.GetRecord (Int32 recordIndex)
at System.Data.Dat aView.get_RowVi ewCache()
at System.Data.Dat aView.GetElemen t(Int32 index)
at System.Data.Dat aView.get_Item( Int32 recordIndex)
at myCode.myMethod
--
Jonathan Allen 3 3426
> What could cause a stack trace like this?
Impossible to tell without more information. Perhaps you could post the
relevant part of myCode.myMethod ?
Greetings,
Wessel
Well, at one level it's an ADO.NET bug - the DataView indexer should return
either a valid DataRowView, or throw an IndexOutOfRange Exception. Instead
it's crashed somwhere in setting up the DataView's row cache.
The question is, what have you done to upset it so?
Is the problem reproducible - can you you trap the exception in the
debugger?
Did the failure occur on first use for the view, or later?
How was the DataView and underlying table configured? Was anything
interesting changed (like filters, schema, ...) after initially loading the
table?
---
Nigel Norris
"Jonathan Allen" <x@x.x> wrote in message
news:O7******** ********@TK2MSF TNGP12.phx.gbl. .. What could cause a stack trace like this?
Message:Object reference not set to an instance of an object. Stack Trace:
at System.Data.Dat aView.GetRecord (Int32 recordIndex) at System.Data.Dat aView.get_RowVi ewCache() at System.Data.Dat aView.GetElemen t(Int32 index) at System.Data.Dat aView.get_Item( Int32 recordIndex) at myCode.myMethod
-- Jonathan Allen
> The question is, what have you done to upset it so?
I have no idea. I was hoping to start with a list of "What could have caused
this?", and then work backwards. It is one of those server error log things
that are difficult to track down without knowing the cause. And the code is
way too complex to know where to start. Is the problem reproducible - can you you trap the exception in the debugger?
Nope. It is happening (rarely) on our server farm. I think I am just going
to have to right this one off as a mystery.
--
Jonathan Allen
"Nigel Norris" <no****@nospam. com> wrote in message
news:uN******** *****@TK2MSFTNG P09.phx.gbl... Well, at one level it's an ADO.NET bug - the DataView indexer should return either a valid DataRowView, or throw an IndexOutOfRange Exception. Instead it's crashed somwhere in setting up the DataView's row cache.
The question is, what have you done to upset it so?
Is the problem reproducible - can you you trap the exception in the debugger?
Did the failure occur on first use for the view, or later?
How was the DataView and underlying table configured? Was anything interesting changed (like filters, schema, ...) after initially loading the table?
--- Nigel Norris
"Jonathan Allen" <x@x.x> wrote in message news:O7******** ********@TK2MSF TNGP12.phx.gbl. .. What could cause a stack trace like this?
Message:Object reference not set to an instance of an object. Stack Trace:
at System.Data.Dat aView.GetRecord (Int32 recordIndex) at System.Data.Dat aView.get_RowVi ewCache() at System.Data.Dat aView.GetElemen t(Int32 index) at System.Data.Dat aView.get_Item( Int32 recordIndex) at myCode.myMethod
-- Jonathan Allen
This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Tom |
last post by:
For some strange reason my WinForms app occasionally
throws a System.NullReferenceException upon invoking the
Clear() method. The app will work fine for a long period
of time and then all of a sudden this exeption is thrown
and after that you just cant ever clear the ListView
control again - even though messages still go into it and
are displayed correctly.
Anybody have any idea what could be causing this?
|
by: Sébastien Ros |
last post by:
During the process of an XML document, I have to make a SelectNodes() call on
an XmlDocument. It returns an isntance of XPathNodeList. I can call it
several times but at one point, the result can't be iterated.
Here is the code:
XmlNodeList nodes = _Document.SelectNodes(myXpathQuery);
foreach(XmlNode n in nodes)
{ ... }
|
by: wackyphill |
last post by:
I loop thru a Filtered DataView and update several of the rows in the
loop. The problem is once a ropw gets altered the DataView's Count
Seems to be altered causing me to access rows that it doesn't think
exist:
DataView runView = new DataView( _db.DS.Tables, where, null,
DataViewRowState.CurrentRows);
foreach( DataRowView row in runView )
{
|
by: Eduard Ralph |
last post by:
Hi,
I have a weird exception happening when calling the new operator. I'm
not sure if this is the intended reaction to the situation or is
actually a problem I've got. In any case a different error message
would be helpful. I would like to know your thoughts on this problem.
The situation:
I have an external Library of C Functions and Structures which are
|
by: Anup Daware |
last post by:
Abstract: I want to filter a dataview with a value where column name
have a SPACE.
Description:-
I bind a dataview to a datagrid,
The query which is fetching the results in Dataset is something like
this:-
Select POSTAL_ADDRESS as "Postal Address" from Emp where ....
Now the column name in Dataview is "Postal Address" which is having a
space, with this column name when I am filtering the Dataview like:-
DataViewAddress.RowFilter = ...
| |
by: Karen Hill |
last post by:
I have a datagridview control on a form with a few of the columns being
DataGridViewCheckBox. Whenever I click on the checkbox to create a new
record I get a NullReference Exception thrown even though I check for
NULL using System.Convert.IsDbNull function.
What gives?
I'm catching the NullReferenceException, although I know it is not
correct to do for normal program flow. What is the solution?
|
by: neeraj |
last post by:
Hi, all
Could anny one give me help how can I use like operator with these data
types "integer , datetime or boolean" in DataView.RowFilter
Actually when I try to get the data from dataview using rowfilter with
like operator
Its working fine when data type of searching column is "string" .
But if data type is "integer , datetime or boolean" its throws
|
by: neeraj |
last post by:
Hi, all
Could anny one give me help how can I use like operator with these data
types "integer , datetime or boolean" in DataView.RowFilter
Actually when I try to get the data from dataview using rowfilter with
like operator
Its working fine when data type of searching column is "string" .
But if data type is "integer , datetime or boolean" its throws
|
by: Zytan |
last post by:
I just got the strangest error. I have exception code that catches a
null reference exception:
catch (NullReferenceException ex) { ... }
The handling code does nothing but print out data from within the
object, ex. So, nothing is changed. And I've found that the
exception object, ex, ITSELF is null!
So, by accessing it to print its innards, it throws another
NullReferenceException (which is, of course, unhandled)! Printing...
|
by: marktang |
last post by:
ONU (Optical Network Unit) is one of the key components for providing high-speed Internet services. Its primary function is to act as an endpoint device located at the user's premises. However, people are often confused as to whether an ONU can Work As a Router. In this blog post, we’ll explore What is ONU, What Is Router, ONU & Router’s main usage, and What is the difference between ONU and Router. Let’s take a closer look !
Part I. Meaning of...
|
by: Hystou |
last post by:
Most computers default to English, but sometimes we require a different language, especially when relocating. Forgot to request a specific language before your computer shipped? No problem! You can effortlessly switch the default language on Windows 10 without reinstalling. I'll walk you through it.
First, let's disable language synchronization. With a Microsoft account, language settings sync across devices. To prevent any complications,...
| |
by: Oralloy |
last post by:
Hello folks,
I am unable to find appropriate documentation on the type promotion of bit-fields when using the generalised comparison operator "<=>".
The problem is that using the GNU compilers, it seems that the internal comparison operator "<=>" tries to promote arguments from unsigned to signed.
This is as boiled down as I can make it.
Here is my compilation command:
g++-12 -std=c++20 -Wnarrowing bit_field.cpp
Here is the code in...
|
by: tracyyun |
last post by:
Dear forum friends,
With the development of smart home technology, a variety of wireless communication protocols have appeared on the market, such as Zigbee, Z-Wave, Wi-Fi, Bluetooth, etc. Each protocol has its own unique characteristics and advantages, but as a user who is planning to build a smart home system, I am a bit confused by the choice of these technologies. I'm particularly interested in Zigbee because I've heard it does some...
|
by: isladogs |
last post by:
The next Access Europe User Group meeting will be on Wednesday 1 May 2024 starting at 18:00 UK time (6PM UTC+1) and finishing by 19:30 (7.30PM).
In this session, we are pleased to welcome a new presenter, Adolph Dupré who will be discussing some powerful techniques for using class modules.
He will explain when you may want to use classes instead of User Defined Types (UDT). For example, to manage the data in unbound forms.
Adolph will...
|
by: TSSRALBI |
last post by:
Hello
I'm a network technician in training and I need your help.
I am currently learning how to create and manage the different types of VPNs and I have a question about LAN-to-LAN VPNs.
The last exercise I practiced was to create a LAN-to-LAN VPN between two Pfsense firewalls, by using IPSEC protocols.
I succeeded, with both firewalls in the same network. But I'm wondering if it's possible to do the same thing, with 2 Pfsense firewalls...
|
by: 6302768590 |
last post by:
Hai team
i want code for transfer the data from one system to another through IP address by using C# our system has to for every 5mins then we have to update the data what the data is updated we have to send another system
|
by: muto222 |
last post by:
How can i add a mobile payment intergratation into php mysql website.
| |
by: bsmnconsultancy |
last post by:
In today's digital era, a well-designed website is crucial for businesses looking to succeed. Whether you're a small business owner or a large corporation in Toronto, having a strong online presence can significantly impact your brand's success. BSMN Consultancy, a leader in Website Development in Toronto offers valuable insights into creating effective websites that not only look great but also perform exceptionally well. In this comprehensive...
| |