Want to add 3-valued object to combo box?

Adding 3 valued object to a combo box in VB.NET

Hi,

We usually come across situations where we add two valued object to a combo box. One is used as an index (Value Member) and the other is used to display the text (Display Member).

But in rare cases we may come across 3-valued object. For ex: I want Entity Id, Entity Name, Entity type to be added to a combo box.

The following code snippet demonstrates how can we achieve this:

'First create a class containing 3 fields & properties for accessing the members.
-------------------------------------------------------------------------------------------
Public Class clsComboBoxItem2

Private m_ItemText As String 'This is for Entityname
Private m_ItemIndex As Int32 'This is for Entity Id
Private m_ItemText2 As String 'This is for Entity type


'Constructor
Public Sub New(ByVal strItemText As String, ByVal intItemIndex As Integer, ByVal strItemText2 As String)

m_ItemText = strItemText
m_ItemIndex = intItemIndex
m_ItemText2 = strItemText2End Sub

End Sub


Public ReadOnly Property ItemIndex() As String
Get
Return m_ItemIndex
End Get
End Property

Public ReadOnly Property ItemText() As String
Get
Return m_ItemText
End Get
End Property

Public ReadOnly Property ItemText2() As String
Get
Return m_ItemText2
End Get
End Property

End Class
-----------------------------------------------------------------------------

Code to add 3-valued elements to combo box:

For i = 0 To ds.Rows.Count - 1
cmbEntities.Items.Add(
New clsComboBoxItem2(ds.Rows(i).Item(0), ds.Rows(i).Item(1), ds.Rows(i).Item(2)))
Next

cmbEntities.DisplayMember = "ItemText"
cmbEntities.ValueMember = "ItemIndex"
-----------------------------------------------------------------------------
Code to retrieve selected item from combo box:

Dim itmCombo2 as clsComboBoxItem2 =
CType(cmbEntities.SelectedItem, clsComboBoxItem2)

Dim EntityId as Int32 = itmCombo2.ItemIndex
Dim EntityName as String = itmCombo2.ItemText
Dim EntityType as String = itmCombo2.ItemText2

----------------------------------------------------------------------------
Hope this is very clear.
Even though this code is in VB.NET, same logic is used for C#.NET also.



Cheers....