473,782 Members | 2,454 Online
Bytes | Software Development & Data Engineering Community
+ Post

Home Posts Topics Members FAQ

Bug with multiselect ListBox?

This works well on a single selection listbox:

protected override OnMouseDown(... )
{
base.OnMouseDow n(...);
MessageBox.Show (this.SelectedI ndex.ToString() );
}

But on a multiple selection listbox you get a IndexOutOfRange exception.
Which is not documented as a possible exception being thrown by accessing
any of the ListBox properties. Apparently in the OnMouseDown event on a
multiple selection listbox something is in the wrong state and all the
selection properties (SelectedItems, SelectedIndices , SelectedIndex) cannot
be accessed.

Bug or feature?

/Gianluca
Nov 17 '05 #1
1 2468
What I would do is instead of using the general OnMouseDown event i would use
the onSelect event. Just a suggestion

"Gianluca" wrote:
This works well on a single selection listbox:

protected override OnMouseDown(... )
{
base.OnMouseDow n(...);
MessageBox.Show (this.SelectedI ndex.ToString() );
}

But on a multiple selection listbox you get a IndexOutOfRange exception.
Which is not documented as a possible exception being thrown by accessing
any of the ListBox properties. Apparently in the OnMouseDown event on a
multiple selection listbox something is in the wrong state and all the
selection properties (SelectedItems, SelectedIndices , SelectedIndex) cannot
be accessed.

Bug or feature?

/Gianluca

Nov 17 '05 #2

This thread has been closed and replies have been disabled. Please start a new discussion.

Similar topics

2
6368
by: Sally | last post by:
I have a simple multiselect listbox with a rowsorce of MemberID, MemberName, SendLetter. SendLetter is a Yes/No field. What is the code to set SendLetter to Yes when the user selects MemberName? I want to do this as the selections are being made not after-the-fact after all selections are made. Thanks! Sally
2
3359
by: Cassie Pennington | last post by:
I am trying to write various items from a multiselect list box to an SQL statement to update a report, without success. SQL only appears to accept hard-coded data or control values from a form, not variable data. Any clues as to how I can write several items to an SQL statement from a multiselect listbox to update a report? Thanks in anticipation Cassie
2
6077
by: Alan Lane | last post by:
Hello world: I'm using Access 2003. I have 2 listboxes. One is a single column. The other has two columns. I can use Dev Ashish's code (thanks Dev!) from the Access MVP Website to accumulate the values from the bound column of a MultiSelect listbox, so that I can include them in a SQL query that will then be the recordsource for a report. This gives me 2 of the 3 values I need to put into the SQL query. However, I can't get the non...
3
3628
by: kaosyeti via AccessMonster.com | last post by:
hey... i have an unbound multiselect listbox on a form that i want to use to populate text boxes on that form. so if a user selects the 3rd item in a list of 20, how can i have that item show up in a text box? then, how can i have a second selected item show up in a different text box, without affecting the 1st one? (lboxOptions, txtboxOptions0, txtboxOptions1, etc..) -- Greg Message posted via AccessMonster.com
1
1853
by: asharma0001 | last post by:
Hi all, I was wondering whether somebody might be able to help me with a question I have on a MS Access Database I'm building. I have created a search form with a few multiselect listboxes. What I'd ultimately like is for the selection(s) in one listbox to filter the second listbox, but am struggling to find a way to do this. I have looked at some of the other solutions on this forum but not been able to find one that works on my database....
0
9639
marktang
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...
0
9479
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,...
0
10311
Oralloy
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...
1
10080
by: Hystou | last post by:
Overview: Windows 11 and 10 have less user interface control over operating system update behaviour than previous versions of Windows. In Windows 11 and 10, there is no way to turn off the Windows Update option using the Control Panel or Settings app; it automatically checks for updates and installs any it finds, whether you like it or not. For most users, this new feature is actually very convenient. If you want to control the update process,...
0
9942
tracyyun
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...
0
5509
by: adsilva | last post by:
A Windows Forms form does not have the event Unload, like VB6. What one acts like?
1
4043
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
2
3639
muto222
by: muto222 | last post by:
How can i add a mobile payment intergratation into php mysql website.
3
2874
bsmnconsultancy
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...

By using Bytes.com and it's services, you agree to our Privacy Policy and Terms of Use.

To disable or enable advertisements and analytics tracking please visit the manage ads & tracking page.