CODEWITHSUNDEEP
vb.netlistview
MadsTheMan
MadsTheMan

Reputation: 703

How can I add information to a specific column and row in a listview?

The short version:

How can I add information to a specific column and row in a listview?

The longer version:

With some textboxes and buttons in another form I add items to my listview like this

        Dim li As ListViewItem

        li = Form1.ListView1.Items.Add("1")
        li.SubItems.Add(tbName1.Text)
        li.SubItems.Add(Form1.tbCount1.Text)
        li.SubItems.Add(tbType1.Text)
        li.SubItems.Add(Form1.tbStatus1.Text)

        Form1.ListView1.EndUpdate()
        Form1.ListView1.Refresh()

This is the output so far...

enter image description here

Tbname1.text (Column below Channel) and tbtype1.text (Column below Type) are specified in textboxes before i hit the button.

Tbcount1.text in form1 contains a number based on count of files within a folder. TbStatus.text is based on how many files there are. This count is hooked to another button (eventually a timer). This is why you'll notice Queue and Status is empty.

Now if I'd hit that button (or timer) - lets say btnUpdate before the settings in my other form, it would look like this

enter image description here

Here comes the problem...

I now want to update only the information under the column Queue (tbcount1.text) and Status (tbstatus.text) with btnUpdate

For example I have this counter

        If Form2.cbc1.Checked = True Then
        Try
            Dim fileTotal As Integer
            For Each item As String In lbChannel1.Items
                fileTotal += My.Computer.FileSystem.GetFiles(item.ToString).Count
            Next
            tbCount1.Text = String.Format("{0}", fileTotal.ToString)
        Catch ex As Exception
            lbErrors.Items.Add(String.Concat("Error: ", ex.Message)) 'Error output
        End Try
        Dim tCount As Integer = 0
        'Til status
        If Val(tbCount1.Text) > 20 Then
            tbStatus1.Text = ("Many files")
        Else
            tbStatus1.Text = ("Good")
        End If
    End If

Which works perfectly. It gives me the number and word I want in the two textboxes, but at the moment I have to refresh the whole listview to get that count-output into the columns.

I've tried...

To add this under the btnUpdate...

        Dim str(4) As String
    Dim itm As ListViewItem

    str(0) = ""
    str(1) = ""
    str(2) = (tbCount1.Text)
    str(3) = ""
    str(4) = (tbStatus1.Text)

    itm = New ListViewItem(str)
    ListView1.Items.Add(itm)

Sadly, this jumps to a second row. See image below.

enter image description here

So here is what I want in other words: when btnupdate is pressed or a timer is at 100; update specified row - column 3 with tbcount.text and update specified row - column 5 with tbstatus.text. That wraps up my question.

I found some information on this in C#, but I need it in VB.net. I might be close or far away. Hopefully it was understandable anyways.

Upvotes: 0

Views: 5636

Answers (1)

Louis van Tonder
Louis van Tonder

Reputation: 3710

You can easily manipulate the listview items directly whenever you want.

If you have the item selected, that you want to change, you simply access it like this:

myListview.selecteditems(0).text = ""
myListview.selecteditems(0).subitems(1).text
myListview.selecteditems(0).subitems(2).text
myListview.selecteditems(0).subitems(3).text

You dont have to re-assign the whole listviewitem every time you change it, just change whatever needs changing...

If you do not have the item selected in the listview (row), you will have to step through the listviewitems collection until you find the item (row) you are looking for, and then manipulate whatever parts of it you need to.

For each item in mylistview.items
 if item.text = "whatoever"
  'this is my item....
  'manipulate it....
  item.text = "sdfdsf"
  item.subitems(1).text = "ddsfdsfdsa"
  'etc
 end if
next

Note: Subitems are (1) based, not 0...

Upvotes: 3

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