Hi,
I am using a checkedlistbox on a windows form and binding it to a
collection of classes.
clbAliases is the checkedlistbox control
selectedplace is a class with property placealiases.Th is property is a
collection of placealias classes. Hopefully the rest is
self-explanatory..
I bind the control as follows:
If SelectedPlace.P laceAliases.Cou nt > 0 Then
SetCLBAliasData Source()
Else
clbAliases.Data Source = Nothing
End If
Private Sub SetCLBAliasData Source()
clbAliases.Data Source = Nothing
clbAliases.Disp layMember = "AliasName"
clbAliases.Data Source = SelectedPlace.P laceAliases
End Sub
Then when I modify the underlying collection ( eg for delete
functionality )
I have this:
Private Sub btnDeleteAlias_ Click(ByVal sender As System.Object, ByVal
e As System.EventArg s) Handles btnDeleteAlias. Click
If SelectedPlace.P laceAliases.Cou nt = 1 Then
MsgBox("You cannot delete the primary alias.")
Exit Sub
Else
Dim item As Object
For Each item In clbAliases.Chec kedItems
'clbParents.Ite ms.Remove(item)
SelectedPlace.P laceAliases.Rem ove(item.placen ameid)
Next
'this forces the control to rebind to the modified
collection
SetCLBAliasData Source
End If
End Sub
Everything works as expected, EXCEPT once the item is removed, and the
user clicks into the checkedlistbox area , specifically on any
remaining item in the box, the following error occurs:
"An unhandled exception of type 'System.Argumen tOutOfRangeExce ption'
occurred in mscorlib.dll
Additional information: Index was out of range. Must be non-negative
and less than the size of the collection."
I have experimented with refreshing the checkedlistbox, and a number
of various other attempted workarounds without success.
The error occurs whether I specify a ValueMember property or not. When
I inspect the underlying collection in the locals window, it appears
normal, as does the items collection of the control. And both contain
the expected number of items. In addition the control correctly
displays the remaining items.
I can only assume that the control is referencing a non-existent
collection member somewhere in the click event event args. Execution
breaks on the line with the class definition :
Public Class GISMain
Can anyone point out a workaround, or my mistake??
Thanks in advance for any help..
Matthew Evans 4 3795
I don't have the answer for you but I have an advice: Stay away from
databound CheckedListBoxe s.. lots of bugs there (at least on version 1.0).
If I were you I'd just populate and mark the items manually. You'll notice
that the databound Checkedlistbox does not keep its state correctly, it
likes to forget which items were selected every now and then.
--
TJoker, MCSD.NET
MVP: Paint, Notepad, Solitaire
*************** *************** **********
"Matthew" <ma************ ****@hotmail.co m> wrote in message
news:4f******** *************** ***@posting.goo gle.com... Hi,
I am using a checkedlistbox on a windows form and binding it to a collection of classes.
clbAliases is the checkedlistbox control selectedplace is a class with property placealiases.Th is property is a collection of placealias classes. Hopefully the rest is self-explanatory..
I bind the control as follows:
If SelectedPlace.P laceAliases.Cou nt > 0 Then SetCLBAliasData Source() Else clbAliases.Data Source = Nothing End If
Private Sub SetCLBAliasData Source() clbAliases.Data Source = Nothing clbAliases.Disp layMember = "AliasName" clbAliases.Data Source = SelectedPlace.P laceAliases End Sub
Then when I modify the underlying collection ( eg for delete functionality ) I have this:
Private Sub btnDeleteAlias_ Click(ByVal sender As System.Object, ByVal e As System.EventArg s) Handles btnDeleteAlias. Click If SelectedPlace.P laceAliases.Cou nt = 1 Then MsgBox("You cannot delete the primary alias.") Exit Sub Else Dim item As Object For Each item In clbAliases.Chec kedItems 'clbParents.Ite ms.Remove(item) SelectedPlace.P laceAliases.Rem ove(item.placen ameid) Next 'this forces the control to rebind to the modified collection SetCLBAliasData Source End If End Sub
Everything works as expected, EXCEPT once the item is removed, and the user clicks into the checkedlistbox area , specifically on any remaining item in the box, the following error occurs:
"An unhandled exception of type 'System.Argumen tOutOfRangeExce ption' occurred in mscorlib.dll
Additional information: Index was out of range. Must be non-negative and less than the size of the collection."
I have experimented with refreshing the checkedlistbox, and a number of various other attempted workarounds without success.
The error occurs whether I specify a ValueMember property or not. When I inspect the underlying collection in the locals window, it appears normal, as does the items collection of the control. And both contain the expected number of items. In addition the control correctly displays the remaining items.
I can only assume that the control is referencing a non-existent collection member somewhere in the click event event args. Execution breaks on the line with the class definition :
Public Class GISMain
Can anyone point out a workaround, or my mistake??
Thanks in advance for any help..
Matthew Evans
"TJoker .NET [MVP]" <no****@nonono. no> wrote in message news:<up******* *******@TK2MSFT NGP10.phx.gbl>. .. I don't have the answer for you but I have an advice: Stay away from databound CheckedListBoxe s.. lots of bugs there (at least on version 1.0). If I were you I'd just populate and mark the items manually. You'll notice that the databound Checkedlistbox does not keep its state correctly, it likes to forget which items were selected every now and then.
-- TJoker, MCSD.NET MVP: Paint, Notepad, Solitaire
*************** *************** **********
Thanks, I had the impression it was a bug. How irritating that the
complex databinding functionality is implemented with bugs. I guess I
need to give 1.1 a go. ma************* ***@hotmail.com (Matthew) wrote in message news:<4f******* *************** ****@posting.go ogle.com>... "TJoker .NET [MVP]" <no****@nonono. no> wrote in message news:<up******* *******@TK2MSFT NGP10.phx.gbl>. .. I don't have the answer for you but I have an advice: Stay away from databound CheckedListBoxe s.. lots of bugs there (at least on version 1.0). If I were you I'd just populate and mark the items manually. You'll notice that the databound Checkedlistbox does not keep its state correctly, it likes to forget which items were selected every now and then.
-- TJoker, MCSD.NET MVP: Paint, Notepad, Solitaire
*************** *************** **********
Thanks, I had the impression it was a bug. How irritating that the complex databinding functionality is implemented with bugs. I guess I need to give 1.1 a go.
Having spent half the day installing fwork v1.1 and visual studio
2003, I now find that the behaviour is identical. Does anyone else
have any ideas?
thanks again,
Matthew ma************* ***@hotmail.com (Matthew) wrote in message news:<4f******* *************** ****@posting.go ogle.com>... "TJoker .NET [MVP]" <no****@nonono. no> wrote in message news:<up******* *******@TK2MSFT NGP10.phx.gbl>. .. I don't have the answer for you but I have an advice: Stay away from databound CheckedListBoxe s.. lots of bugs there (at least on version 1.0). If I were you I'd just populate and mark the items manually. You'll notice that the databound Checkedlistbox does not keep its state correctly, it likes to forget which items were selected every now and then.
-- TJoker, MCSD.NET MVP: Paint, Notepad, Solitaire
*************** *************** **********
Thanks, I had the impression it was a bug. How irritating that the complex databinding functionality is implemented with bugs. I guess I need to give 1.1 a go.
Uh....no.. the error message was as above:
its now this:
An unhandled exception of type 'System.Argumen tOutOfRangeExce ption'
occurred in microsoft.visua lbasic.dll
Additional information: Specified argument was out of the range of
valid values. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
by: Chibi |
last post by:
Hello!
I'm back again with another problem.
First of all, thank you to Jacob for helping me understand
a bit more about NNTP commands.
So now the problem:
I have a collection of potentially thousands of items. I
|
by: Andla Rand |
last post by:
Hi,
I have created a windows application in CSharp that is using a web
browser control.
When i did some coding to handle a chat window an exception was thrown
with the following message:
"COM object that has been separated from its underlying RCW can not be
used"
The chat browser window is constantly updating its content
automatically.
My question is how can i work around this problem?
|
by: |
last post by:
David,
A partial answer to your question:
The 'MultiColumn' property of a CheckedListBox does not
cause it to display multiple FIELDS of an item... it
causes it to display the items themselves in multiple
columns.
In other words, if you have 20 items in your Items
|
by: Steve Cutting |
last post by:
Hi all,
I have a CheckedListBox on one pane of a TabControl on a form. I find that
whenever the user clicks a different tab then comes back, any checks that
were in the list have disappeared.
After a bit of experimenting I have discovered that the problem only occurs
when the CheckedListBox is using a dataset table as the source. If I
manually add items to it's collection using the properties window, it works
fine. If I bind it to a...
|
by: Brian Mitchell |
last post by:
I have no idea what I am doing wrong, but I have a CheckedListBox (Bound to
an IList) on a TabControl and everytime I switch tabs I lose my checks. Is
there something I'm missing? If I look at the properties of my IList class I
can still see the properties have not changed (which means the items in the
box should still be chekced) it's just like for some reason the ListBox
doesn't keep the checks.
Thanks for the help!!
| |
by: Capt_Ron |
last post by:
Hello and thank you for taking the time to look.
I Have a form that asks for options. I need the user to click any of the
options listed. I'd like to use the CheckedListBox for this but I need to
know how it works.
I have the options in a table in a database. I would like to have the
datasource of the CheckedListBox be a datareader that has 2 columns. One
column is the Primary Key and the other is the text of the option.
|
by: Capt_Ron |
last post by:
Hello,
I would like to set the value of the item in the checked list box.
I have a datareader that has 2 columns. PK and TEXT
I want the TEXT as the Item and the PK as the Value.
I can not find anywhere that I can SET the value. But I can GET the
SELECTED ITEM VALUE.
Any direction would be helpfull.
|
by: Terry Olsen |
last post by:
Dim dirs() as string = Directory.GetDirectories(MyPath)
CheckedListBox.DataSource = dirs
CheckedListBox.Update
For I as Integer = 0 To CheckedListBox.Items.Count - 1
CheckedListBox.SelectedIndex = I
DoMySub(CheckedListBox.SelectedItem)
Next
The first line in the For loop (CheckedListBox.SelectedIndex = I) sometimes
|
by: Steve Teeples |
last post by:
Can someone show me an example of how to place a "CheckedListBox" property
within a PropertyGrid?
--
-----------
Thanks,
Steve
|
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: jinu1996 |
last post by:
In today's digital age, having a compelling online presence is paramount for businesses aiming to thrive in a competitive landscape. At the heart of this digital strategy lies an intricately woven tapestry of website design and digital marketing. It's not merely about having a website; it's about crafting an immersive digital experience that captivates audiences and drives business growth.
The Art of Business Website Design
Your website is...
|
by: agi2029 |
last post by:
Let's talk about the concept of autonomous AI software engineers and no-code agents. These AIs are designed to manage the entire lifecycle of a software development project—planning, coding, testing, and deployment—without human intervention. Imagine an AI that can take a project description, break it down, write the code, debug it, and then launch it, all on its own....
Now, this would greatly impact the work of software developers. The idea...
|
by: conductexam |
last post by:
I have .net C# application in which I am extracting data from word file and save it in database particularly. To store word all data as it is I am converting the whole word file firstly in HTML and then checking html paragraph one by one.
At the time of converting from word file to html my equations which are in the word document file was convert into image.
Globals.ThisAddIn.Application.ActiveDocument.Select();...
|
by: adsilva |
last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
|
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.
| |