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ImageList into ListView

Posted on 2006-11-02
Medium Priority
Last Modified: 2008-02-01
Hi Experts.

I've created a WinForm with a ListView which imports data from a text file into columns. So far so good. What I want to do is add a bitmap to the 1st column. The bitmap will be from a file also.  I have setup the imageList to point to a specific bmp.

Here's my code.
Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
        Dim fileName As String = "c:\test.txt"
        If System.IO.File.Exists(fileName) Then

            ListView1.View = View.Details

            Dim inputLine As String
            Dim sr As New System.IO.StreamReader(fileName)
            Dim header As Boolean = True
            Dim value As String
            Dim values() As String
            Dim ch As ColumnHeader

            inputLine = sr.ReadLine
            While Not IsNothing(inputLine)
                ' replace double quotes with single quotes
                inputLine = Replace(inputLine, Chr(34) & Chr(34), Chr(34))
                ' remove leading and trailing quotes
                inputLine = inputLine.Substring(1, inputLine.Length - 2)
                ' create an array from the values
                values = Split(inputLine, Chr(34))

                If header Then
                    header = False
                    For Each value In values
                        ch = New ColumnHeader
                        ch.Text = value
                        ch.Width = 70
                        ImageList1.Images.Add(Bitmap.FromFile("c:\buddy.bmp"))  'Here is the code i added!!***********
                    ' create a new listview item with the values
                    ListView1.Items.Add(New ListViewItem(values))
                End If

                ' read the next line
                inputLine = sr.ReadLine
            End While

            MessageBox.Show(fileName, "File Not Found", MessageBoxButtons.OK, MessageBoxIcon.Error)
        End If

I also added 'ListView1.SmallImageList = ImageList1' but I aint getting no images appear in the first column  :(
Question by:RobertoFreemano
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Author Comment

ID: 17861507
Hi hclgroup,

Thanks for the Link, but it only show the basics of the Collection Editors. I've already looked into this.

Thanks anyway.

LVL 86

Expert Comment

by:Mike Tomlinson
ID: 17861871
Right...first you set the ImageList:

    ListView1.SmallImageList = ImageList1

Then you need to set the ImageIndex() property for EVERY single ListViewItem.

This can be done in the constructor:

    ListView1.Items.Add(New ListViewItem(values, 0))

The 0 is the image index to use from the ImageList.

Or you can create the ListViewItem seperately and modify it before adding it to the ListView:

    Dim lvi As New ListViewItem(values)
    lvi.ImageIndex = 0
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Author Comment

ID: 17862385
That works a treat,

Thanks Idle_Mind.

I would like to award you the points, but I'm willing to increase if you could assist with an extension to my little vb project?

I won't be offended if you do not wish to assist! you can still have the 80 points!


Author Comment

ID: 17862453

So far, the text format that is loaded into the columns are displayed as


I now have an image to display each user thanks to Idle_Mind. I would like to change the image in a particular row that displays the word 'Unknown' in one of the subitems... example

 username    employeeid     Tel""
 :)  Bob         18273456        01925etc"
 :)  Bill          18299456        01925etc"
 :(  Gill          2827344          Unknown"

I understand the theory, but not sure how to achieve.
LVL 86

Expert Comment

by:Mike Tomlinson
ID: 17862814
Will the "Unknown" be in a specific column? ...or do you want the different icon if ANY of the columns has it?

Probably the latter:

    Dim lvi As New ListViewItem(values)
    lvi.ImageIndex = 0 ' Assume it is all good...
    For each value As String in values
        If value.ToLower.IndexOf("unknown") <> -1 Then
            lvi.ImageIndex = 1 ' ...until proven otherwise
            Exit For
        End If

Author Comment

ID: 17863154


The Icon to change if 'Unknown' is in any of the other columns.

LVL 86

Accepted Solution

Mike Tomlinson earned 800 total points
ID: 17863221
See my previous post...

Though, you could check "inputLine" directly if you want:

    Dim lvi As New ListViewItem(values)
    If inputLine.ToLower.IndexOf("unknown") = -1 Then
        lvi.ImageIndex = 0 ' Index of Smiley
        lvi.ImageIndex = 1 ' Index of Frown
    End If

Author Comment

ID: 17863254

when I tryped:

1 Dim lvi As New ListViewItem(values)
2   lvi.ImageIndex = 0 ' Assume it is all good...
3    For each value As String in values
4       If value.ToLower.IndexOf("unknown") <> -1 Then
5           lvi.ImageIndex = 1 ' ...until proven otherwise
6          Exit For
7     End If
8 Next
9  ListView1.Items.Add(lvi)

Name 'Values' is not declared message on lines 1 & 3

Any ideas?

Author Comment

ID: 17863255
is it because I'm on 2003?

Author Comment

ID: 17863289
It works

Author Comment

ID: 17863295
Cheers Idle_Mind.

You're a Genius!

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