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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

ELDONXP
  • 11
  • 2

1 Answers1

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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();
              }
              ));
takim
  • 81
  • 7
  • i get an error using this : CS0649 The 'cpuram.messageTimer' field is never assigned and will always have its default value of null – ELDONXP Dec 27 '20 at 14:39
  • Try assigning it to a field or assigning null? Like this DispatcherTimer messageTimer = null; OR DispatcherTimer messageTimer = new DispatcherTimer(); – takim Dec 27 '20 at 14:50
  • The would be because, as the message states, you haven't set (assigned) messageTimer to an instance of a dispatchertimer. – Andy Dec 27 '20 at 14:51
  • even after using DispatcherTimer messageTimer = null; i get this error – ELDONXP Dec 27 '20 at 15:05