Listview checkboxes count

[PillKilla]

Hi guys,

Can you please help me with the listview. I am working on my listview as I want to count how many checkboxes that I have ticked and unticked on my listview. Please can you tell me how I could do this?

If you do know how I could do this in simple way, I would be very grateful if you could tell me how I could do this.


Thanks,
PillKilla

[ident]

Dim cItems As ListView.CheckedListViewItemCollection = Me.ListView1.CheckedItems
MsgBox(cItems.Count)

[4x2y]

Try this

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        For j As Integer = 0 To ListView1.Items.Count - 1
            If ListView1.Items.Item(j).Checked Then
                Debug.Print("Item number " & j + 1 & " is checked.")
            End If
        Next
    End Sub

[MattP]

Dim query = TestListView.Items.Cast(Of ListViewItem)()
        Dim checked = query.Where(Function(item) item.Selected = True).Count()
        Dim unchecked = query.Where(Function(item) item.Selected = False).Count()

[PillKilla]

Thanks guys, but none of them have help me to solve the problem.

I want the messagebox to display when I have click on the checkboxes.

I have one checkbox ticked and when I click on the other checkbox to get tick, I get the messagebox display twice which it said that I have click on item 1 and item 2 which i have only click on item 2. The item 1 have already ticked itself when I ran the form.

Here's the code I have used:

    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
            For j As Integer = 0 To ListView1.Items.Count - 1
                If ListView1.Items.Item(j).Checked Then
                    Debug.Print("Item number " & j + 1")
                End If
            Next
        End Sub

I find that the code are not doing it correctly. I only want the messagebox to display in what checkbox i have tick and untick while the other checkboxes are already ticked and unticked.

Any idea how i can get the messagebox to display as when I click on the checkboxes depend on what checkboxes i have click on?

[4x2y]

Put your code inside ItemChecked event

Private Sub ListView1_ItemChecked(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemCheckedEventArgs) Handles ListView1.ItemChecked
        If e.Item.Checked Then
            MsgBox(e.Item.Text & " has been checked")
        Else
            MsgBox(e.Item.Text & " has been unchecked")
        End If
    End Sub

[PillKilla]

Thanks 4x2y, but I only want to use it in the button1 click event.

Any idea how I can get the messagebox to display when I click on the button after I have click on the checkboxes in the listview?

[4x2y]

Save the checked item in a module level variable and use it in button click event, like this

Public Class Form1
 
    Private mlviLatestCheckedItem As ListViewItem
 
    Private Sub ListView1_ItemChecked(ByVal sender As Object, ByVal e As System.Windows.Forms.ItemCheckedEventArgs) Handles ListView1.ItemChecked
        mlviLatestCheckedItem = e.Item
    End Sub
 
    Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If mlviLatestCheckedItem.Checked Then
            MsgBox(mlviLatestCheckedItem.Text & " has been checked")
        Else
            MsgBox(mlviLatestCheckedItem.Text & " has been unchecked")
        End If
    End Sub
 
End Class

[PillKilla]

Thanks 4x2y, how i can check for each checked items in the listview when I save the checked item in a module level variable?

[4x2y]

Look in above code and you will find the answer under Button1_Click sub.

[PillKilla]

Sorry, i have a look and it is not there. I would get something like this:

If CheckedItems.Checked Then
  For Each item As ListViewItem In CheckedItems
	MessageBox.Show(CheckedItems.SubItems(1).Text)
  Next item
End If

[4x2y]

I'm talking about this one

Private Sub Button1_Click(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles Button1.Click
        If mlviLatestCheckedItem.Checked Then
            MsgBox(mlviLatestCheckedItem.Text & " has been checked")
        Else
            MsgBox(mlviLatestCheckedItem.Text & " has been unchecked")
        End If
    End Sub

[PillKilla]

Yeah, but when I select for each listview checked items, how do i get the messagebox display?

I tried to use this:

If CheckedItems.Checked Then
  For Each item As ListViewItem In CheckedItems.Checked
	MessageBox.Show(CheckedItems.SubItems(1).Text)
  Next item
End If

I get an error: for each statement cannot operate on variables of type 'bool'

Any idea how to fix it?

[4x2y]

For Each item As ListViewItem In ListView1.CheckedItems
            If item.Checked Then
                MessageBox.Show(item.SubItems(1).Text)
            End If
        Next item

[PillKilla]

Thanks 4x2y, but I have got a problem. When I click the checkboxes in the listview, I can only get the messagebox display once a time when I click more than one checkboxes which I have ticked the item 1 checkbox to false and the item 2 checkbox to true.

How i can get the messagebox to display more than one when I click on each checkboxes?

[4x2y]

I gave you code for displaying msg when check/uncheck item (post #9), and code to iterate checked items (post #15)

Sorry, i don't understand what exactly you want!

I will be offline soon, so, sorry if i don't reply fast.

[PillKilla]

Well when I click on the checkbox item 1 to set to false and checkbox item 2 to set to true, I can only ge the messagebox that says the checkbox 2 is set to true which it should display the messagebox twice to say that the checkbox item 1 is set to false and checkbox item 2 is set to true.

When I click on each checkbox in the listview, I can only get the messagebox to display once at a time when one of the checkbox is set to false.

How i can display it more than one when I click on the checkboxes whether if it set to true and false?

[4x2y]

Well when I click on the checkbox item 1 to set to false and checkbox item 2 to set to true, I can only ge the messagebox that says the checkbox 2 is set to true which it should display the messagebox twice to say that the checkbox item 1 is set to false and checkbox item 2 is set to true.

This is difficult situation because you will need to store each item's check state in a collection then when you click the button, iterate collection and compare to current items' check state to see which item its check state changed.