Solved

Removing multiple string items from a listbox

Posted on 2004-10-15
2
261 Views
Last Modified: 2010-04-23
Suppose I have ListBox with MultiSelect.Simple set to true. There are several string items in the ListBox, for sake of example, let's say:

ListBox1.Items.Add("One")
ListBox1.Items.Add("Two")
ListBox1.Items.Add("Three")

If the user selects Items "One" and "Two" then presses the delete button in the app, I want to remove them without causing an error. But I'm not sure how to do this, and here is why. My first attempt looked something like this:

        Dim x As Integer
        For x = (lbListBox.Items.Count - 1) To 0 Step -1
            If lbListBox.Items(x).Selected = True Then
                lbListBox.Items.RemoveAt(lbListBox.Items.IndexOf(lbListBox.Items(x)))
            End If
        Next

This doesn't work, because the string object doesn't have a .Selected property, so that's no good.

My second attempt looks like this:

        For Each s As String In lbListBox.SelectedItems
            lbListBox.Items.Remove(s)
        Next

This almost works, but since the ListBox resizes dynamically as you go along, this causes an error, hence the need to reverse iterate as you delete (as above). I don't know of a way to do a reverse For-Each, or that would solve the problem.

What I came up with that works, but isn't so pretty, is this:

        Dim al As ArrayList = New ArrayList

        For Each s As String In lbListBox.SelectedItems
            al.Add(s)
        Next

        For i As Integer = al.Count - 1 To 0 Step -1
            lbListBox.Items.RemoveAt(lbListBox.FindString(al(i)))
        Next

Basically, I put each selected item into an ArrayList, that I can then reverse through and delete the items in the ListBox one by one.

Like I said, this works - but is there a more elegant or proper solution?
0
Comment
Question by:toddhd
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
2 Comments
 
LVL 10

Expert Comment

by:Hans Langer
ID: 12319906
HI,
try this

   For x As Int32 = 0 To ListBox1.SelectedItems.Count - 1
         ListBox1.Items.Remove(ListBox1.SelectedItems.Item(0))
      Next
0
 
LVL 25

Accepted Solution

by:
RonaldBiemans earned 50 total points
ID: 12319908
Hi Toddhd,

this should work

        While lbListBox.SelectedItems.Count > 0
            LbListBox.Items.Remove(lbListBox.SelectedItem)
        End While
0

Featured Post

Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

This article explains how to create and use a custom WaterMark textbox class.  The custom WaterMark textbox class allows you to set the WaterMark Background Color and WaterMark text at design time.   IMAGE OF WATERMARKS STEPS Create VB …
Calculating holidays and working days is a function that is often needed yet it is not one found within the Framework. This article presents one approach to building a working-day calculator for use in .NET.
Add bar graphs to Access queries using Unicode block characters. Graphs appear on every record in the color you want. Give life to numbers. Hopes this gives you ideas on visualizing your data in new ways ~ Create a calculated field in a query: …
Sometimes it takes a new vantage point, apart from our everyday security practices, to truly see our Active Directory (AD) vulnerabilities. We get used to implementing the same techniques and checking the same areas for a breach. This pattern can re…

628 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question