BeginGetSelectedItems Method

Visual Basic
C#

'Declaration
 
Public Function BeginGetSelectedItems( _
   ByVal callback As AsyncCallback, _
   ByVal asyncState As Object _
) As IAsyncResult

'Usage
 
Dim instance As ListBox
Dim callback As AsyncCallback
Dim asyncState As Object
Dim value As IAsyncResult
 
value = instance.BeginGetSelectedItems(callback, asyncState)

public IAsyncResult BeginGetSelectedItems( 
   AsyncCallback callback,
   object asyncState
)

Parameters

callback: The AsyncCallback delegate to be called when the operation is complete.
asyncState: An object containing state information for the operation.

Return Value

An IAsyncResult representing the result of the operation.

When working with a source that is not data-virtualized (asynchronous), use SelectedItems instead.

VB.NET

Private Sub GetSelectedItems()
   Dim result As IAsyncResult = Me.sllbListBox.BeginGetSelectedItems( New AsyncCallback( AddressOf Me.ProcessSelectedItems ), Nothing )
   If( result.IsCompleted ) Then
      Dim selectedItems As IEnumerable( Of Object ) = Me.sllbListBox.EndGetSelectedItems( result )
   End If
End Sub
 
Private Sub ProcessSelectedItems( ByVal result As IAsyncResult )
   If( result.CompletedSynchronously ) Then
      Return
   End If
   Dim selectedItems As IEnumerable( Of Object )  = Me.sllbListBox.EndGetSelectedItems( result )
End Sub

C#

private void GetSelectedItems()
{
   IAsyncResult result = this.sllbListBox.BeginGetSelectedItems( new AsyncCallback( this.ProcessSelectedItems ), null );
   if( result.IsCompleted )
      IEnumerable<object> selectedItems = this.sllbListBox.EndGetSelectedItems( result );
}
 
private void ProcessSelectedItems( IAsyncResult result )
{
   if( result.CompletedSynchronously )
      return;
   IEnumerable<object> selectedItems = this.sllbListBox.EndGetSelectedItems( result );
}

Target Platforms: Windows 11, Windows 10, Windows 7, Windows Vista SP1 or later, Windows XP SP3, Windows Server 2008 (Server Core not supported), Windows Server 2008 R2 (Server Core supported with SP1 or later), Windows Server 2003 SP2

Reference

ListBox Class
ListBox Members