[RESOLVED] Listbox confusion

Hello, I am one confused dog

I am trying to use a listview in detail view as a sort of flexgrid to show a selection of information in memory. Now I can get the title bar ok and split it into parts but if I try to add more than one 'row' to the list the others blank out. I cannot seem to work out in my head how it works.

Code:

---

  Dim I As Long
        Dim ListVI As ListViewItem

        With lvDetails
            'Clear All
            .Clear()

            .Columns.Add("Site", 200, HorizontalAlignment.Left)
            .Columns.Add("Town", 200, HorizontalAlignment.Left)
            .Columns.Add("PostCode", 100, HorizontalAlignment.Left)
            .Columns.Add("Serial", 100, HorizontalAlignment.Left)

            'Create Column Details
            For I = 1 To UBound(Sites)

                'Clear Items
                ListVI = New ListViewItem(Sites(I).Name)

                ListVI.SubItems.Add(Sites(I).Town)
                ListVI.SubItems.Add(Sites(I).Postcode)
                ListVI.SubItems.Add(Sites(I).Serial)

                .Items.Add(ListVI)

            Next I


        End With

---

I have even tried 'arraying' the listVI object and then using AddRange but that doesnt work either :(

Any pointers would be appreciated :thumb:

not sure what you mean by blank out.. if they rows are there but have blank strings as their text? or they don't appear at all..

2 things in your code that stand out right away are:

1) you should be using integer instead of long, the fact that you are using long makes me think you have option strict off, which you should really turn on.

2) your looping from 1 to ubound(array), array indexes start at 0, so unless you are skipping the first element of the sites array on purpose, your code is skipping that element.

Now these 2 things don't specifically explain your issue per-say, I can tell you this code works fine:

Code:

---

    Public Structure SiteInfo
        Dim Name As String
        Dim Town As String
        Dim Postcode As String
        Dim serial As String
    End Structure

    Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load

        Dim Sites(3) As SiteInfo

        With Sites(0)
            .Name = "Test 1"
            .Postcode = "00001"
            .Town = "Town 1"
            .serial = "001"
        End With
        With Sites(1)
            .Name = "Test 2"
            .Postcode = "00002"
            .Town = "Town 2"
            .serial = "002"
        End With
        With Sites(2)
            .Name = "Test 3"
            .Postcode = "00003"
            .Town = "Town 3"
            .serial = "003"
        End With
        With Sites(3)
            .Name = "Test 4"
            .Postcode = "00004"
            .Town = "Town 4"
            .serial = "004"
        End With

        Dim I As Integer
        Dim ListVI As ListViewItem

        With lvDetails
            'Clear All
            .Clear()

            .Columns.Add("Site", 200, HorizontalAlignment.Left)
            .Columns.Add("Town", 200, HorizontalAlignment.Left)
            .Columns.Add("PostCode", 100, HorizontalAlignment.Left)
            .Columns.Add("Serial", 100, HorizontalAlignment.Left)

            'Create Column Details
            For I = 0 To Sites.GetUpperBound(0)

                'Clear Items
                ListVI = New ListViewItem(Sites(I).Name)

                ListVI.SubItems.Add(Sites(I).Town)
                ListVI.SubItems.Add(Sites(I).Postcode)
                ListVI.SubItems.Add(Sites(I).serial)

                .Items.Add(ListVI)

            Next I


        End With
    End Sub

---

I have just been thu the listview learning curve mt self :)

this may also help

http://www.vbforums.com/showthread.php?t=493151

*BANG*
*BANG*
*BANG*

Although my head hurts after that I feel I deserve it. I was being a right retard and setting element 1 in my test array twice instead of setting number 2.

I feel it is going to be one of those days

It works now lol. Thanks for the help and I will change that variable to integer. Am I right in saying integers in .net are now the equivilent of longs in vb6?

yes you are correct in saying that.

VB6 integer = .NET short (16 bit int)
VB6 long = .NET integer (32 bit int)

Cheers

only just moving over and its very confusing when they change things like that. :s

I hear ya, but you pick it all up pretty fast.