WPF Gui refresh from different Thread

.net, wpf

Solution

this is the code snippet I use to fix any cross thread calls when updating a WPF UI.

 this.Dispatcher.BeginInvoke(
            (Action)delegate()
        {
            //Update code goes in here
        });

Hope this helps

Problem

I have a popup Gui with command binding, ``` <Grid x:Name="popup" Visibility="Hidden" DataContext="{Binding Path=PopupMsg}" > <TextBlock x:Name="tbMessage" Grid.Row="0" Grid.Column="0" Grid.ColumnSpan="3" Margin="20,70,10,0" Text="{Binding Path=Message}" FontSize="16"/> <Button x:Name="btnPopupOk" Grid.Row="1" Grid.Column="2" Content="{Binding Path=OkContent}" Margin="10,40,10,10" Command="{Binding}" CommandParameter="true" /> </Grid> </Border> </Grid> ``` in the C# file i bind the command: ``` CommandBinding okCommandBinding = new CommandBinding(OkCommand); okCommandBinding.Executed += popupButtons_Executed; okCommandBinding.CanExecute += okCommandBinding_CanExecute; CommandBindings.Add(okCommandBinding); btnPopupOk.Command = OkCommand; ``` Its working fine when I use it from the same Thread, when I get a callback from Web Service which is in a different thread I use Dispatcher to show a message, i can see the new text in the popup but the binding isn't working the button remaining unavailable (CanExecute = false), When I click on the screen with the mouse, the popup update the real value of CanExecute and the button is appear available. ``` System.Windows.Threading.DispatcherPriority.Normal, new Action( delegate() { popup.Visibility = Visibility.Visible; popup.Focus(); })); ```

Original source