Dispatcher.BeginInvoke Method (Delegate, array<Object[])

Parameters

• d
  Type: System.Delegate
  A delegate to a method that takes multiple arguments, which is pushed onto the Dispatcher event queue.

• args
  Type: array<System.Object[]
  An array of objects to pass as arguments to the specified method.

Return Value

Type: System.Windows.Threading.DispatcherOperation
An object, which is returned immediately after BeginInvoke is called, that represents the operation that has been posted to the Dispatcher queue.

Private Delegate Sub AddTextDelegate(ByVal p As Panel, ByVal text As String)

Private Sub AddText(ByVal p As Panel, ByVal text As String)
    p.Children.Clear()
    Dim t As New TextBlock
    t.Text = text
    p.Children.Add(t)
End Sub

Private Sub TestBeginInvokeWithParameters(ByVal p As Panel)
    If p.Dispatcher.CheckAccess() _
        Then AddText(p, "Added directly.") _
        Else p.Dispatcher.BeginInvoke(New AddTextDelegate( _
            AddressOf AddText), p, "Added by Dispatcher.")
End Sub

private delegate void AddTextDelegate(Panel p, String text);

private void AddText(Panel p, String text)
{
    p.Children.Clear();
    p.Children.Add(new TextBlock { Text = text });
}

private void TestBeginInvokeWithParameters(Panel p)
{
    if (p.Dispatcher.CheckAccess()) AddText(p, "Added directly.");
    else p.Dispatcher.BeginInvoke(
        new AddTextDelegate(AddText), p, "Added by Dispatcher.");
}