How to output in textbox(winui 3) in a task?

[sxmike]

I try to print some information in textbox in a task, using code like below:

DispatcherQueue.TryEnqueue(() => tbOutput.Text += Environment.NewLine + message);

But message does not show up immediately, instead all messages show up after the task completed.

How to do?

[castorix]

How do you launch the Task ?
I tested by setting it inside a Periodic Timer and it seems to work fine, with this TextBox :

  <TextBox x:Name="tbOutput" Width="300" Height="200"  TextWrapping="Wrap" AcceptsReturn="True"
                      ScrollViewer.VerticalScrollMode="Enabled"
                    ScrollViewer.VerticalScrollBarVisibility="Auto" >
                
            </TextBox>