Why DispatcherTimer does not click?

Question

This WPF application (VisualStudio 2015 Community and .NER Framework 4.5.1) is expected when a button is pressed to write on the console at a rate of one per second all the items contained in List playList. In fact the DispatcherTimer_Tick method is never called and consequently playListIndex is never called and the program is stucked in the while loop. Two files are attached: MainWindow.xaml.cs MainWindow.xaml Thank you in advance for any help

Amit Gupta · Answer

HiPierre As while loop holds all the event and do not allow other events to get fired you can add one line so that it will do other events also. Take reference of System.Windows.Forms to your project. Just add one line and your while (playListIndex { // do nothing but wait the next tick} System.Windows.Forms.Application.DoEvents(); } --------------------------------------------------------------------------------- Mark it as an answer if it solves your problem ---------------------------------------------------------------------------------

Amit Gupta · Answer

Hi Pierre Yes Of course there are several ways to acheive a single task in programming. You can use pushframe method but it better performs when you program is multi threaded. In your program it just freezes/blocks the current UI so it is more than enough to use that. Moreover Application.Doevents () function is not depreciated for the time being. Microsoft will notify about any such depreciation in its tooltips prior to remove that function. As in the given link of stackoverflow it has been mentioned that after .net 4.0 it has been depreciated but it doesn't. I'll like to inform that type a snippet. Thread.Suspend (); Just hover your mouse in the above method and look at the tooltip that it has been depreciated. Hence Microsoft will let you notify before any such depreciation. Regards Amit

Pierre Michallet · Answer

Hi Amit Thankyou for your comment. Although II do not have at the moment a need for that function I had a look at it on the Web. It seems that as far as WPF applications are concerned the use of the System.Windows.DoEvents method is somewhat deprecated. (stackoverflow.com/questions/4502037/where is the Application.DoEvents in WPF) Instead Microsft is showing an other way to use it with the System.Windows.Threading.dispatcher.pushframe method. https://msdn.microsoft.threading.dispatcher.pushframe.aspx Being an amateur who practices software development on his own as a retirement hobby my level of expertise is not high enough to have an opinion on the pro's and con's of each approach. May be after having tried them some time... Have a nice day. Pierre

Pierre Michallet · Answer

Thank you for your help. The reference you gave me on theMSDN social network although a little bit different of what I want to do has shown how I should stucture my code. Have a nice week end Pierre

Delpin Susai Raj · Answer

http://stackoverflow.com/questions/7567296/why-is-a-dispatchertimer-tick-event-not-occurring-on-time

Delpin Susai Raj · Answer

https://social.msdn.microsoft.com/Forums/vstudio/en-US/d5bea6f0-2c27-40a7-b948-8c0461d17327/problem-disabling-buttons-from-a-dispatcher-timer?forum=wpf