I have a list of links and need to check some data in it.
i placed all the list in a listbox and each item is verified for some result
now i want to see how many items are processed and how many are still need to process
Example: in a label it must display total count of items and items completed and it must change once a item is finished.
over view of my code is:
Private Sub Button2_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button2.Click
For Each item In ListBox2.Items
!!!!==== MY CODE====!!!!
Next Item
End Sub
Once an item is finished label must change the count.
Insert a counter variable inside the For Each and use it.
Dim i as integer = 0
For Each item In myListBox.Items
// your code goes here
// do you need to check if your code went ok?
i = i+1
label.Text = string.Format("Processing item {0} of {1}", i, myListBox.Items.Count)
Next item
Forgive me if i'm syntactically wrong there, long time I haven't used VB.
Related
I have a CheckedListBox of 10 names A to J (it's a string but here I'm just using abc), and I want to make it so that every time a user check something, the text will be shown in the listbox simultaneously. I have tried this:
For i = 0 To chklistbxDrugAvailableList.Items.Count - 1
Dim drugs As String = CType(chklistbxDrugAvailableList.Items(i), String)
If chklistbxDrugAvailableList.GetItemChecked(i) Then
listbxYourOrder.Items.Add(drugs)
End If
'drugs = nothing
Next
But when I check A,B,C the text in the Listbox got repeated like so:
A
A
B
A
B
C
I don't know why this is happening. I didn't declare drugs as an array. Even when I used the drugs = nothing, it still give repeated values.
What should I do? Sorry if this is a noob question.
Here is how I would do the whole thing:
Private Sub CheckedListBox1_ItemCheck(sender As Object, e As ItemCheckEventArgs) Handles CheckedListBox1.ItemCheck
'Clear the current ListBox contents.
ListBox1.Items.Clear()
'Get the indexes of the currently checked items.
Dim checkedIndices = CheckedListBox1.CheckedIndices.Cast(Of Integer)()
'Add the current index to the list if the item is being checked, otherwise remove it.
checkedIndices = If(e.NewValue = CheckState.Checked,
checkedIndices.Append(e.Index),
checkedIndices.Except({e.Index}))
'Get the checked items in order and add them to the ListBox.
ListBox1.Items.AddRange(checkedIndices.OrderBy(Function(n) n).
Select(Function(i) CheckedListBox1.Items(i)).
ToArray())
End Sub
or like this:
Private Sub CheckedListBox1_ItemCheck(sender As Object, e As ItemCheckEventArgs) Handles CheckedListBox1.ItemCheck
'Get the indexes of the currently checked items.
Dim checkedIndices = CheckedListBox1.CheckedIndices.Cast(Of Integer)()
'Add the current index to the list if the item is being checked, otherwise remove it.
checkedIndices = If(e.NewValue = CheckState.Checked,
checkedIndices.Append(e.Index),
checkedIndices.Except({e.Index}))
'Get the checked items in order and add them to the ListBox.
ListBox1.DataSource = checkedIndices.OrderBy(Function(n) n).
Select(Function(i) CheckedListBox1.Items(i)).
ToArray()
End Sub
The difference is that, because the second option uses data-binding, the first item in the ListBox will be selected by default.
The reason that it needs to be a bit verbose is that the ItemCheck event is raised before the item is checked or unchecked. For that reason, we need to get the currently checked items first and then either add or remove the current item, depending on whether the current item is being checked or unchecked.
EDIT:
Here's an option that doesn't require clearing the ListBox:
Private Sub CheckedListBox1_ItemCheck(sender As Object, e As ItemCheckEventArgs) Handles CheckedListBox1.ItemCheck
Dim item = CheckedListBox1.Items(e.Index)
If e.NewValue = CheckState.Checked Then
ListBox1.Items.Add(item)
Else
ListBox1.Items.Remove(item)
End If
End Sub
The issue with that is that the items will appear in the ListBox in the order you checked them, rather than the order they appear in the CheckedListBox. The other options keep the items in the same order in both lists.
If I understand your question I would this:
lstbxYourOrder.Items.Clear()
For Each l As String In chklistbxDrugAvailableList.CheckedItems
listbxYourOrder.Items.Add(l)
Next
I have a lisview that I have created that loads information into the program from selected files. I am now trying to add in a search button to the information typed in so that it highlights (selects) the line of code that information is found in (Entire line for both columns) Multiselect is turned on.
The part I am stuck with is if it was a normal listbox I would use selectedindex but with Listview this method does not seem to work and only has selectedIndexCollection or selected items.
If I try something like these they dont seem to work and want more information added
List.SelectedIndexCollection = Lines.text
List.SelectedItems = Lines.text
Edit from Comments:
Private Sub Search_Click(sender As System.Object, e As System.EventArgs)
Handles Search.Click
Do Until List.FocusedItem.text = lines.text
List.FocusedItem = List.Items(0) +1
Loop
End Sub
i given code like this:
Private Sub txtemployeename_KeyDown(ByVal sender As Object, ByVal e As System.Windows.Forms.KeyEventArgs) Handles txtemployeename.KeyDown
keyval = e.KeyData
Dim keyData As System.Windows.Forms.Keys = e.KeyData
If keyData = Keys.Down Then
LstEmployee.Visible = True
LstEmployee.Focus()
End If
End Sub
while i am cliking down arrow first time that is not focusing to listbox,second time am clicking down arrow that is focusing..also once cursor come to tha list box,if i clik enter that should be displayed in text box..for that i given code like this..
Private Sub LstEmployee_Enter(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles LstEmployee.Enter
txtemployeename.Text = LstEmployee.SelectedItem
End Sub
but this is not working properly..for loading list box i given code like this:
Private Sub txtemployeename_KeyPress(ByVal sender As System.Object, ByVal e As System.Windows.Forms.KeyPressEventArgs) Handles txtemployeename.KeyPress
Dim s As String = txtemployeename.Text
LstEmployee.Visible = True
loadlistbox(LstEmployee, "select Ename from EmployeeMaster_tbl where Ename LIKE'%" & s & "%' ")
End Sub
You should rely on the KeyUp event rather than on the KeyDown one. Also for the ListBox you just need the SelectedIndexChanged event. Additionally, your code has quite a few errors (wrong query (-> you don't need to call your DB every time to order the items in the ListBox), relies on SelectedIndex rather than on SelectedItem...). Here you have an updated version:
Private Sub txtemployeename_KeyUp(sender As Object, e As System.Windows.Forms.KeyEventArgs) Handles txtemployeename.KeyUp
Dim s As String = txtemployeename.Text
LstEmployee.Visible = True
Dim list = LstEmployee.Items.Cast(Of String)()
Dim query = From item As String In list Where item.Length >= s.Length AndAlso item.ToLower().Substring(0, s.Length) = s.ToLower() Select item
If (query.Count > 0) Then
Dim newItems = New List(Of String)()
For Each result In query
newItems.Add(result)
Next
LstEmployee.Items.Clear()
For Each newItem In newItems
LstEmployee.Items.Add(newItem)
Next
End If
End Sub
Private Sub LstEmployee_SelectedIndexChanged(sender As System.Object, e As System.EventArgs) Handles LstEmployee.SelectedIndexChanged
txtemployeename.Text = LstEmployee.SelectedItem
End Sub
The code above checks for occurrences (i.e., if the whole string in the txtemployeename matches (caps do not matter) the starting substring of, at least, one element in LstEmployee) every time a new character is introduced in txtemployeename. The ListBox is updated with these ocurrences. txtemployeename displays the name of the selected item in LstEmployee.
I hope that this will be enough to help you to build the code required to deliver the exact functionalities you are after.
NOTE: bear in mind that this approach (deleting/adding Items) is incompatible with cases where the ListView is populated with a DataSource. If you rely on a DataSource you would have to update this code accordingly.
NOTE2: the proposed approach deals with the elements in the ListView. You have to introduce these elements at the start from whatever source you are using; this code only updates existing information (items in the ListBox). Also bear in mind that this code is expected to be corrected to match your exact requirements; for example: list has to be associated with the total number of items (the ones retrieved from your datasource at the start), not with the current ones (as displayed in the code; it just represents a simplified version of the problem): every time a new population occurs all the items (other than the target ones) are deleted and thus the ListBox does not represent a reliable source. Example to understand this: at the start, you have "aaaa", "bbbb", "cccc"; if you type "a", all the elements except "aaaa" would be deleted. If you type now "b" and consider the actual elements in the ListBox, no change would occur as far as the only element is "aaaa"; you would have to consider all the original elements (which, as suggested via comment, might be stored at the start in an array/list of strings).
I want to adding checked item from checkedlistbox to my combobox, but i have a little problem here. Combobox only show 1 item last checked.
This is my sample code.
If CheckedListBox1.CheckedItems.Count <> 0 Then
For i As Integer = 0 To CheckedListBox1.CheckedItems.Count - 1
cbCheckedItem.Text = CheckedListBox1.CheckedItems(i).ToString
Next i
End If
anyone can help me show all checked item??
thank's for your help...
You aren't adding the items to the combo box, you're only setting its Text property. That's only changing the text currently displayed in the combo box, and only one item can be displayed at a time.
If you want the items to be permanent and selectable, you need to add them to the combo box control's Items collection.
Sample code:
If CheckedListBox1.CheckedItems.Count > 0 Then
For Each checkedItem In CheckedListBox1.CheckedItems
cbCheckedItem.Items.Add(checkedItem.ToString())
Next
End If
Or, better yet, use the AddRange method:
If CheckedListBox1.CheckedItems.Count > 0 Then
Dim checkedItems() As String = CheckedListBox1.CheckedItems.Cast(Of String).ToArray()
cbCheckedItems.Items.AddRange(checkedItems)
End If
Oddly enough the CheckedListBox has a CheckedItems property, which is a collection. As such you can loop through it like you can any other collection, using a For or For Each loop.
then, Each item needs to be added to the Items collection of the ComboBox.
like this sample:
Public Class frmCheckedListBox
Private Sub frmCheckedListBox_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
Me.CheckedListBox1.Items.Clear()
Me.CheckedListBox1.BeginUpdate()
Me.CheckedListBox1.Items.Add("One")
Me.CheckedListBox1.Items.Add("Two")
Me.CheckedListBox1.Items.Add("Three")
Me.CheckedListBox1.Items.Add("Four")
Me.CheckedListBox1.Items.Add("Five")
Me.CheckedListBox1.EndUpdate()
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
For Each Item As String In Me.CheckedListBox1.CheckedItems
Me.ComboBox1.Items.Add(Item)
Me.ComboBox1.SelectedIndex = 0
Next
End Sub
End Class
As sample code shows, the CheckedItems collection contains the items that are checked, just as the name suggests. It doesn't contain a Boolean value for each an every item to indicate whether it is checked or not. If an item is checked then that item is in the CheckedItems, and if it isn't then it isn't. You simply need to loop through the collection and get every item in it, because it contains all the items that are checked and none that aren't.
in the end you can put :
Me.Combobox1.items.clear()
because when it would click with sample code it would have the one that clicked then on the next click would return the previous one it had clicked and then the new one all compiled in the combobox selection menu
perhaps my answer can help you solve your problems
Combobox doesn't have a multiselect option. so only one item at a time could be selected.
I created a groupbox and then populate it with buttons during runtime. I also created a button, say Button1 to loop through the groupbox and delete those buttons. Here's my code
for Button1:
Public Sub removeControls()
For Each ctrl As Control In GroupBox1.Controls
GroupBox1.Controls.Remove(ctrl)
ctrl.Dispose()
Next
End Sub
Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
removeControls()
End Sub
When executed, it only removes some of the controls inside the GroupBox1, not all. Can you explain what is missing in my code to make it work? Thanks.
When you delete controls in a For Each loop, you're actually modifying the collection that you're trying to loop through. When you remove the first item in the collection, the second item moves up to become the first. But now, when you reach the second index of your loop, the third item is in its place. You've effectively skipped removing the second item, and only removed the first and third. And so on through the entire loop.
Instead, you need to loop through the controls in reverse order and remove the item at each index. By starting to removing items from the end, you won't affect the order or position of the items.
So, just change your method to the following:
Public Sub RemoveControls()
For i As Integer = (GroupBox1.Controls.Count - 1) To 0 Step -1
Dim ctrl As Control = GroupBox1.Controls(i)
GroupBox1.Controls.Remove(ctrl)
ctrl.Dispose()
Next i
End Sub
You are changing the collection as you are itterating through it, and that should not be done.
Rather use something like
For i As Integer = GroupBox1.Controls.Count - 1 To 0 Step -1
Dim ctrl As Control = GroupBox1.Controls(i)
GroupBox1.Controls.Remove(ctrl)
ctrl.Dispose()
Next