[RESOLVED] Dataitem class

[staticbob]

Guys,

I have used this class in VB.NET code to create dataitems that I can add to comboboxes, listboxes etc. I can display the text item, and still get hold of other database fields associated with that row by using . .

Ctype(cb_names.selecteditem,dataitem).Altfield1 for example.

Can I do something like this in ASP.NET ? I have tried using this but I'm getting an overload resolution fail when adding items to a listbox.

Basically, I need to add items to a list box from a datatable, I need to display the text field, but retain the id field so I know which record the users are selecting.

Am I going about this the right way ?

Cheers
Bob

Public Class DataItem
    Public id As Integer
    Public text As String
    Public row As DataRow
 
    Public Overrides Function ToString() As String
        Return text
    End Function
    Public Sub New(ByVal row As DataRow)
        Me.new(row, "id", "name")
    End Sub
    Public Sub New(ByVal id As Integer, ByVal text As String)
        Me.id = id
        Me.text = text
    End Sub
    Public Sub New(ByVal row As DataRow, ByVal id As Integer, ByVal text As String)
        Me.row = row
        Me.id = id
        Me.text = text
    End Sub
    Public Sub New(ByVal row As DataRow, ByVal idfield As String, ByVal textfield As String)
        id = Nz(row(idfield), 0)
        text = Nz(row(textfield), "")
        Me.row = row
    End Sub

This is an example of how I've used it in VB.NET . . .

cb_rfiissuedby.Items.Clear()
                    dt = db.ContractStaff.Table(CurrentContract.ID)
                    For Each row As DataRow In dt.Rows
                        cb_rfiissuedby.Items.Add(New DataItem2(row, "ID", "Name", "CompanyName"))
                    Next
                    dt.Dispose()
                    dt = Nothing

[mendhak]

The reason you can't do this is because of the nature of the web control that is eventually rendered. A combobox/listbox can only have text in it, or ListItems which hold a "text" value and "value" value.

You'd have to do something like this:

Me.DropDownList1.Items.Add(New ListItem("Show This", "17"))

Of course, instead of "Show This", you could have something like MyObject.SomeField.ToString(), but it's limited to just these two. No objects.

[staticbob]

Mendhak, thankyou.

The value and text fields of a listbox / ddlist will suit just fine.

Ta
Bob