I can loop through all items in checked list box, by index
http://www.dotnetheaven.com/article/checkedlistbox-in-vb.net
Dim sb As New System.Text.StringBuilder
For Each item In CheckedListBox1.SelectedItems
sb.Append(item)
sb.Append(" ")
Next
MessageBox.Show(sb.ToString())
But I just want to check if an item is checked by boolean, and by name.
For Each item In CheckedListBox1.Items
MsgBox(item.ToString)
Next
Loops them.. But I want
item("myItem").checked? or .selected properties?
Please help.
As with SelectedItems, the checked items are in a collection:
For Each item In CheckedListBox1.CheckedItems
MessageBox.Show(item.ToString)
Next
There is also a CheckedIndicies collection of the indexes of the items checked. NB CheckedItems is not the same as SelectedItems
Related
Sorry im new :-D
i wanne do the following in a List box:
add item
add item
....
im counting the added items and display them to a label.text. and also sending that to a .txt that updates.
when all items are added i want to press a bttn "end adding Items" and then doubleclick the items to edit them(i want to count that aswell.)
So want it look like this "changed Items / total Items"
how can i count the changes done by the doubleclick ? and how to display it ?
this is the doubleclick i did ;D
Dim intIndex As Integer = lstBla.Items.IndexOf(lstBla.SelectedItem)
Dim objInputBox As Object = InputBox("Edit", lstBla.SelectedItem)
If Not objInputBox = Nothing Then
lstBla.Items.Remove(lstBla.SelectedItem)
lstBla.Items.Insert(intIndex,objInputBox)
End If
End Sub
and this is the save to the lable.txt
Total.Text = lstBla.Items.Count
My.Computer.FileSystem.WriteAllText("C:\Counter\Total.txt", Total.Text, False)
I'm trying to move multi Items from ListBox1 to ListBox2, but I receive an error message that the below underlined is not a collection type.
Imports System.Web.UI.WebControls
Imports System.Web.UI.WebControls.ListItemCollection
For Each selectedItem In ListBox1.SelectedItem
ListBox2.Items.Add(ListBox1.SelectedItem)
ListBox1.Items.Remove(ListBox1.SelectedItem)
Next
Change your code like this:
For Each selectedItem In ListBox1.SelectedItems
ListBox2.Items.Add(selectedItem)
ListBox1.Items.Remove(selectedItem)
Next
The ForEach statement needs to apply to a list, so you can retrieve individual items in 'selectedItem' variable. Then you can add/remove that individual item as you like
To check selected items in a listbox, you need to iterate each item and write a condition that asks if the current item is selected or not.
For Each item In ListBox1.Items
If item.selected Then
ListBox2.Items.Add(item)
ListBox1.Items.Remove(item)
End If
Next
System.Web.UI.WebControls.ListControl.Items returns a collection of items in the control, each Item has Selected property which returns a boolean value.
For Windows Form Applications: //Edit [OP is using System.Web.UI.WebControls
SelectedItem will return only single item.
SelectedItems will return a collection type based on selected items
Make sure that the SelectionMode is not One or None
so instead of using SelectedItem try to use SelectedItems
Within a listview I have a number of checked items. I would like to get the tags for all checked items.
I have managed to do this by looping through each listviewItem and adding the .Tag to a collection but I feel that there must be a more efficient way to achieve this.
Any ideas?
You could just do:
Dim SelectedTags = From lvi As ListViewItem In ListView1.CheckedItems Select lvi.Tag
For Each SelectedTag In SelectedTags
Debug.Print(SelectedTag)
Next
I'm trying to compare the listbox1 items to the listbox2 items then remove the duplicated ones.
listbox1 contains "link1 link2 link3 link4 link5"
'listbox1 is download items list
listbox2 contains "link9 link5 link3"
'listbox2 is downloaded items list
Since "link3" and "link5" already exists in the listbox2, I want to remove them from the listbox1.
Please help me.
Code below doesn't work.
If listbox1.Items.Contains(listbox2.Items) Then
listbox1.Items.Remove(listbox2.Items)
end if
What I understand from your sample code that you want to remove items from Listbox1 which already exist in Listbox2. Then use the code below.
For Each itm In ListBox2.Items
If ListBox1.Items.Contains(itm) Then ListBox1.Items.Remove(itm)
Next
Here we are iterating through all the items of Listbox2 and removing them from Listbox1 in case it exist.
You could do this with one loop. Sorry, I only speak C#, not VB.NET, but the concept will be clear:
foreach (var item2 in listbox2.Items)
{
if (listbox1.Items.Contains(item2))
listbox1.Items.Remove(item2);
}
Also, you could try this with LINQ:
foreach (var item in listbox2.Items)
{
var inOtherList = (from it1 in listbox1.Items where it1.Equals(item) select it1);
foreach (var item in inOtherOtherList)
listbox1.Items.Remove(item);
}
Another approach to the same problem: Identify the common set and then remove it from the Items collection of the first listbox
Dim common = listbox1.Items.Cast(Of string)().
Intersect(listbox2.Items.Cast( Of string)()).
ToList()
for each x in common
listbox1.Items.Remove(x)
Next
You can use like this also: to list distinct items from two list boxes into a listbox
ListBox1.Items.AddRange(ListBox2.Items)
Dim DistinctObj = (From LBI As Object In ListBox1.Items Distinct Select LBI).Cast(Of String)().ToArray
ListBox1.Items.Clear()
ListBox2.Items.Clear()
ListBox1.Items.AddRange(DistinctObj)
Hi I know this may sound a little weird but I am trying to have a master list that contains other lists of controls. Here is what I have so far.
'Create master list of control lists. Each member of this list will be a list containing one rows worth of controls
Dim masterList As New List(Of List(Of Control))
Dim rowList As New List(Of Control)
For Each Control As Control In flpExceptionControls.Controls
rowList.Add(Control)
If flpExceptionControls.GetFlowBreak(Control) = True Then
masterList.Add(rowList)
rowList.Clear()
End If
Next
For Each row As List(Of Control) In masterList
MsgBox(row.Count.ToString)
Next
The message box is showing that each of those lists have a count of 0, but I know it is adding all the controls to those objects because it shows it when I step through the code. I'm guessing I am just not accessing the list objects contained in the master list correctly.
Any suggestions would be greatly appreciated.
Your problem is here:
If flpExceptionControls.GetFlowBreak(Control) = True Then
masterList.Add(rowList)
rowList.Clear()
End If
You are clearing the contents of the same list, which you are then adding some new items to, and clearing again, and adding the same reference to the master list. Essentially; all of your items in masterList are the same, empty list.
You need to create a new sub-list for each. Don't clear any lists.
Dim rowList As New List(Of Control)
For Each Control As Control In flpExceptionControls.Controls
rowList.Add(Control)
If flpExceptionControls.GetFlowBreak(Control) = True Then
masterList.Add(rowList)
rowList = New List(Of Control)
End If
Next