Change messageTimer.Interval at runtime even if the messageTimer is in another method

Question

I want to change the interval of my dispatcher time in run time here is my code :

InitializeComponent();
        DispatcherTimer messageTimer = new DispatcherTimer();
        messageTimer.Tick += new EventHandler(messageTimer_Tick);
        messageTimer.Interval =  TimeSpan.FromSeconds(1);
        messageTimer.Start();

idk how to change the interval of the DispatcherTimer at run time

Answer 1

I created two textblocks and a button.

1. textblock : x:Name="txt_Count"

2. textblock : x:Name="txt_TimeNow"

3. Button : x:Name="btn_changeTime_s"

        int count = 0;
        DispatcherTimer messageTimer;
        DispatcherTimer TimeNow;
        public MainWindow()
        {
            InitializeComponent();
   
            messageTimer = new DispatcherTimer();
            messageTimer.Tick += new EventHandler(messageTimer_Tick);
            messageTimer.Interval = TimeSpan.FromSeconds(1);
            messageTimer.Start();
   
            TimeNow = new DispatcherTimer();
            TimeNow.Tick += new EventHandler(TimeNow_Tick);
            TimeNow.Interval = TimeSpan.FromMilliseconds(100);
            TimeNow.Start();
        }
   
        private void TimeNow_Tick(object sender, EventArgs e)
        {
            txt_now.Text = DateTime.Now.ToString();
        }
   
        private void messageTimer_Tick(object sender, EventArgs e)
        {
            txt_Count.Text = count.ToString();
            count++;
        }
   
        private void btn_changeTime_s_Click(object sender, RoutedEventArgs e)
        {
            messageTimer.Interval = TimeSpan.FromSeconds(2);
        }
   

If you need to modify the Main UI Thread in the background, use the syntax

 txt_Count.Dispatcher.Invoke(DispatcherPriority.Normal,new Action(delegate ()
              {
                  txt_Count.Text = count.ToString();
              }
              ));