Returns a value indicating whether the specified item is selected.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
- Type: System.Int32
The zero-based index of the item that determines whether it is selected.
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 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. listBox1.Items.Add("A") listBox1.Items.Add("C") listBox1.Items.Add("E") listBox1.Items.Add("F") listBox1.Items.Add("G") listBox1.Items.Add("D") listBox1.Items.Add("B") ' 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) Else ' 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
Windows 8.1, Windows Server 2012 R2, Windows 8, Windows Server 2012, Windows 7, Windows Vista SP2, Windows Server 2008 (Server Core Role not supported), Windows Server 2008 R2 (Server Core Role supported with SP1 or later; Itanium not supported)