ListBox.GetSelected Method (Int32)


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Returns a value indicating whether the specified item is selected.

Namespace:   System.Windows.Forms
Assembly:  System.Windows.Forms (in System.Windows.Forms.dll)

Public Function GetSelected (
	index As Integer
) As Boolean


Type: System.Int32

The zero-based index of the item that determines whether it is selected.

Return Value

Type: System.Boolean

true if the specified item is currently selected in the ListBox; otherwise, false.

Exception Condition

The index parameter is less than zero or greater than or equal to the value of the Count property of the ListBox.ObjectCollection class.

You can use this method to quickly determine whether a specified item is selected. This method is useful when a specific operation needs to be performed when a specific item in a multiple-selection ListBox is selected.

The following code example demonstrates how to use the GetSelected method to determine which items in a ListBox are selected in order to select the items that are not selected and deselect the items that are selected. The example also demonstrates using the SelectionMode property to enable a ListBox to have more than one selected item and uses the Sorted property to demonstrate how to sort items in a ListBox automatically. This example requires that a ListBox, named listBox1, has been added to a form and that the InitializeMyListBox method defined in the example is called from the Load event of the form.

Private Sub InitializeMyListBox()
   ' Add items to the ListBox.

   ' Sort all items added previously.
   listBox1.Sorted = True

   ' Set the SelectionMode to select multiple items.
   listBox1.SelectionMode = SelectionMode.MultiExtended

   ' Select three initial items from the list.
   listBox1.SetSelected(0, True)
   listBox1.SetSelected(2, True)
   listBox1.SetSelected(4, True)

   ' Force the ListBox to scroll back to the top of the list.
   listBox1.TopIndex = 0
End Sub

Private Sub InvertMySelection()

   Dim x As Integer
   ' Loop through all items the ListBox.
   For x = 0 To listBox1.Items.Count - 1

      ' Determine if the item is selected.
      If listBox1.GetSelected(x) = True Then
         ' Deselect all items that are selected.
         listBox1.SetSelected(x, False)
         ' Select all items that are not selected.
         listBox1.SetSelected(x, True)
      End If
   Next x
   ' Force the ListBox to scroll back to the top of the list.
   listBox1.TopIndex = 0
End Sub

.NET Framework
Available since 1.1
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