WPF background data trigger changes interface state-heartbeat implementation

This year to do a host computer control WPF project, do a small summary of the next time to find

Please don't spray with blood, I'm just a rookie. ___by Abalone Team

A code variable that changes the value of a variable, and the color of the circle that binds to the variable is a heartbeat effect.

In the online data trigger feeling not much, waste a lot of time, here to do a summary

1: Notice

 class   notifybase:inotifypropertychanged { public  event   PropertyChangedEventHandler propertychanged;  public  void  Onpropertychanegd ( Span style= "color: #0000ff;" >string   PropertyName) { if (propertychanged! = null   this . PropertyChanged (this ,  PropertyChangedEventArgs (PropertyName)); }}} 
 
  

class Notifymodels:notifybase     {        privatebool  heartBeat;          Public BOOL HeartBeat        {            getreturn  heartBeat;}             Set {heartBeat = value;            ONPROPERTYCHANEGD ("HeartBeat");             }}}

The first one is needless to say, the base class for notifications,

The second is the data I need, is the bool type of heartbeat (usually can be detected with the lower computer other communication software communication status, intuitive)

2: The code of the rectangle

This data triggers binding= "{Binding HeartBeat}" to bind the heartbeat of the background DataContext

Change the corresponding style change; I use the bool type, so I use the true/false; look like int can also

<ellipse x:name="Ellstatus"Verticalalignment="Center"Horizontalalignment="Center"minheight=" -"Minwidth=" -"maxheight=" -"Maxwidth=" -"> <ellipse.style > <style targettype="{x:type Ellipse}"> <Style.Triggers> <datatrigger binding="{Binding HeartBeat}"Value="True"> <setter property="Shape.fill"Value="Red"/> </DataTrigger> <datatrigger binding="{Binding HeartBeat}"Value="False"> <setter property="Shape.fill"Value=" White"/> </DataTrigger></Style.Triggers> </Style> </Ellipse.Style> </Ellipse>

3: Code behind the Scenes

Use a timer to change the value inside the notification

Assigned to

=
It's done.

 Public Partial classMainwindow:window {notifymodels models; PrivateSystem.Timers.Timer Timer;  PublicMainWindow () {InitializeComponent (); Models=Newnotifymodels (); Ellstatus.datacontext =  models;  Timer=NewSystem.Timers.Timer ( +); Timer. Elapsed+=NewSystem.Timers.ElapsedEventHandler (timer_elapsed); Timer. Enabled=true; }        voidTimer_elapsed (Objectsender, System.Timers.ElapsedEventArgs e) {models. HeartBeat= !models.        HeartBeat; }

WPF background data trigger changes interface state-heartbeat implementation