Combobox question

Combobox question

• db_guy

  I arrive with another question on the same thing, I guess. Could I access to an element of the combobox with a ID I mean. The example given works excelent if the SelectedIndexChanged occurs, but what happens if I have an ID which is retrieved of a table Is there a way to access directly to the object (ID,Name) of the combobox passing the ID and without reading all elements....

  Thanks in advance...

  
  

• jamie r

  Thanks. I'd want to insert elements in a combox. For example "Monday", "tuesday".... the depending on the choosen day, I want to save a value in my table. For example for "monday" I'd want to save "2" in my table. That is only an example generic.
  
  
  

• spin_n

  not entirely, you can only do that (what you showed) when binding. the ValueMember and DisplayMember can only be used, AFAIK, when you set the DataSource of the bindable control.

  Can you explain exactly what you are trying to do

  
  
  

• Jamie Thomson

  one thing you *could* do is implement the selectedIndexChanged event, then when the user makes a selection, get the index and then save it to your table. would this be ok
  
  

• Tom Nash

  I think you would have to iterate through the collection to identify locate the index number of a specific ID number.

  All the collection knows is its a collection of objects which have a tostring method.

  
  

• lord_8

  funny, I was going to post a similar solution but was wondering if it were efficient/appropriate enough. Good job spotty and congrats on the 4000 post
  
  

• Nicolas2608

  Thanks spotty !!! Excelent !!!! Thanks ahmedilyas tot!!!.
  

• trickhat

  Thank you very much, but it is not what I'd want. The example I gave is generic. What happens if I process lettres Another idea

  Thanks...

  
  

• Kutlu Araslı

  This is really simple and doesnt require databinding. If you implement any class (in my case ListItem) and as long as you have a Public Overide on the tostring method - this is what will be displayed in the listbox/combobox etc.

  When you retrieve the selected item - you can cast it to the original object type and access all the specific properties such as ID, Name etc.

  Here's an example which does just what you talking about.

  
  Public Class Form1

  Private Sub Form1_Load(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles MyBase.Load
  Dim x As New ListItem("abc", 1)

  Me.ComboBox1.Items.Add(x)
  x = New ListItem("def", 2)
  Me.ComboBox1.Items.Add(x)

  x = New ListItem("ghi", 3)
  Me.ComboBox1.Items.Add(x)

  End Sub

  Private Sub ComboBox1_SelectedIndexChanged(ByVal sender As System.Object, ByVal e As System.EventArgs) Handles ComboBox1.SelectedIndexChanged
  Dim x As ListItem = Me.ComboBox1.SelectedItem
  Dim s As String = x.ID & vbCrLf & x.Name
  MsgBox(s)
  End Sub
  End Class

  
  Public Class ListItem
  Private StrItemName As String = ""
  Private IntID As Integer
  Public ReadOnly Property Name() As String
  Get
  Return StrItemName
  End Get
  End Property
  Public ReadOnly Property ID() As Integer
  Get
  Return IntID
  End Get
  End Property

  Public Overrides Function ToString() As String
  Return StrItemName
  End Function

  Public Sub New(ByVal Name As String, ByVal ID As Integer)
  StrItemName = Name
  IntID = ID
  End Sub

  End Class

  
  
• Combobox question