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SelectionMode Enumeration

Specifies the selection behavior of a list box.

[Visual Basic]
<Serializable>
<ComVisible(True)>
Public Enum SelectionMode
[C#]
[Serializable]
[ComVisible(true)]
public enum SelectionMode
[C++]
[Serializable]
[ComVisible(true)]
__value public enum SelectionMode
[JScript]
public
   Serializable
 ComVisible(true)
enum SelectionMode

Remarks

This enumeration is used by classes such as ListBox and CheckedListBox.

Members

Member name Description
MultiExtended Multiple items can be selected, and the user can use the SHIFT, CTRL, and arrow keys to make selections
MultiSimple Multiple items can be selected.
None No items can be selected.
One Only one item can be selected.

Example

[Visual Basic, C#, C++] The following 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 assumes 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.

[Visual Basic] 
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

[C#] 
private void 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;
}

private void InvertMySelection()
{
   // Loop through all items the ListBox.
   for (int x = 0; x < listBox1.Items.Count; x++)
   {
      // Determine if the item is selected.
      if(listBox1.GetSelected(x) == true)
         // Deselect all items that are selected.
         listBox1.SetSelected(x,false);      
      else
         // Select all items that are not selected.
         listBox1.SetSelected(x,true);
   }
   // Force the ListBox to scroll back to the top of the list.
   listBox1.TopIndex=0;
}

[C++] 
private:
   void InitializeMyListBox()
   {
      // Add items to the ListBox.
      listBox1->Items->Add(S"A");
      listBox1->Items->Add(S"C");
      listBox1->Items->Add(S"E");
      listBox1->Items->Add(S"F");
      listBox1->Items->Add(S"G");
      listBox1->Items->Add(S"D");
      listBox1->Items->Add(S"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;
   }

   void InvertMySelection()
   {
      // Loop through all items the ListBox.
      for (int x = 0; x < listBox1->Items->Count; x++)
      {
         // Select all items that are not selected,
         // deselect all items that are selected.
         listBox1->SetSelected(x, !listBox1->GetSelected(x));      
      }
      // Force the ListBox to scroll back to the top of the list.
      listBox1->TopIndex=0;
   }

[JScript] No example is available for JScript. To view a Visual Basic, C#, or C++ example, click the Language Filter button Language Filter in the upper-left corner of the page.

Requirements

Namespace: System.Windows.Forms

Platforms: Windows 98, Windows NT 4.0, Windows Millennium Edition, Windows 2000, Windows XP Home Edition, Windows XP Professional, Windows Server 2003 family

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

See Also

System.Windows.Forms Namespace | ListBox | CheckedListBox

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