c# - Need help separating event driven code into layers that respect the MVVM pattern -


i have view titled newcalibrationview.xaml/.cs , has viewmodel newcalibrationviewmodel.cs

the xaml view:

<stackpanel grid.column="0" orientation="horizontal" horizontalalignment="left" >     <label content="run time:" fontsize="16" fontweight="bold" margin="10,0,0,0"/>     <textblock name="clocktextblock" text="00:00:00:00" fontsize="16" foreground="red" margin="5" fontweight="bold"/> </stackpanel> <stackpanel grid.column="1" orientation="horizontal" horizontalalignment="right">     <label content="sample count:" fontsize="16" fontweight="bold" margin="10,0,0,0"/>     <textblock text="0" name="samplecountdigit" foreground="red" fontsize="16" fontweight="bold" margin="5"/> </stackpanel>

as 1 can see, have textblock displays stop-watch of sorts, , presently code running stopwatch in code behind view (newcalibrationview.cs)

public partial class newcalibrationview: usercontrol {     private dispatchertimer dt = new dispatchertimer();     private stopwatch stopwatch = new stopwatch();      private string _currenttime = string.empty;     private int _samplecount = 0;      public newcalibrationview()     {         initializecomponent();          dt.tick += new eventhandler(dt_tick);         dt.interval = new timespan(0, 0, 0, 0, 1);     }      private void dt_tick(object sender, eventargs e)     {         if (stopwatch.isrunning)         {             timespan ts = stopwatch.elapsed;              _currenttime = string.format("{0:00}:{1:00}:{2:00}", ts.hours, ts.minutes, ts.seconds);              clocktextblock.text = _currenttime;              if (ts.seconds%8 == 0)             {                 _samplecount++;                 samplecountdigit.text = _samplecount.tostring();             }         }     }      private void startbutton_click(object sender, routedeventargs e)     {         clocktextblock.foreground = brushes.green;         stopwatch.start();         dt.start();     }

because code updates view directly in event handler (dt.tick();) dispatchtimer's tick event, having hard time figuring out leave in code-behind , put in viewmodel.

given code-behind code have shown here, should go in view , should go in viewmodel?

to start, thought startbutton_click() should transformed command (which put in vm), if case doing alone mean have put declaration of dispatchtimer , stopwatch vm well, means rest of code (event hander, registration , on) have in vm.

does sound right?

if me, i'd move view model. i'd bind text properties of 2 textblock 2 strings on view model. said, bind button command property icommand on viewmodel. also, keep boolean property on viewmodel bind color of textblock (you'll need data triggers)


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