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how to get the selected item of a listview by column name?

Posted on 2006-05-31
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Last Modified: 2007-12-19
Hi,
i want to get the user selected columns of a unbound listview by thir column name. I have build the view like this:

        '.......
        With lvMaster
            .Columns.Add("ID", 0, HorizontalAlignment.Right)
            .Columns.Add("Group", 100, HorizontalAlignment.Left)
            .Columns.Add("Comment", 200, HorizontalAlignment)
        End With

        conn.Open()
        dr = cmd.ExecuteReader(CommandBehavior.CloseConnection)
        Do While (dr.Read())
            lvItem = New ListViewItem(dr.Item("ID").ToString)
            lvItem.SubItems.Add(dr.Item("Group").ToString)
            lvItem.SubItems.Add(dr.Item("Comment").ToString)
            Call lvMaster.Items.Add(lvItem)
        Loop

    Private Sub lvMaster_selectedIndexChanged(ByVal sender As Object, ByVal e As System.EventArgs) _
                     Handles lvMaster.SelectedIndexChanged

        'this doesn't work
        Dim col As ListView.ColumnHeaderCollection = lvMaster.Columns
        Dim boo As Boolean = col.ContainsKey("Group")   'always = false
        Dim idx As Integer = col.IndexOfKey("Group")      'always = -1

        'this works, but col is selected by index rather than by name
        Dim s as string = lvMaster.SelectedItems(0).SubItems(1).Text
        '.......
   End Sub

Has anyone an idea how ro select  the column by their header name?
Thanks

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Question by:CumulusGranitus
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by:Bob Learned
ID: 16802130
.NET version?

Bob
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Accepted Solution

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Bob Learned earned 1500 total points
ID: 16802193
Aaah, yes, 2005 ;)

1) ContainsKey looks for columns by name and not by text.  

2) "Group" is the heading text for the column, and not the name, since you used the (text, width, textAlign) form of the ColumnHeader constructor.

3) If you want to use key, you need to use the (key, text, width, textAlign) form of the ColumnHeader constructor.

 lv_Master.Columns.Add("ID", "ID", 0, HorizontalAlignment.Right)
 lv_Master.Columns.Add("Group", "Group", 100, HorizontalAlignment.Left)
 lv_Master.Columns.Add("Comment", "Comment", 200, HorizontalAlignment)

Bob
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Author Comment

by:CumulusGranitus
ID: 16802872
Sorry i forgot. Yes it is VB.NET 2005 under Framework 2.0 .

The Add method dows not allow to give the alignment parameter if you specify the first 2 parameters. So the solution that works looks like

   v_Master.Columns.Add("Group", "Group", 100 )

That works very well. Thank you.
Now i have to look how to specify the alignment for the column....

CumulusGranitus


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