WPF background data triggers interface status change-Heartbeat implementation, wpf background

WPF background data triggers interface status change-Heartbeat implementation, wpf background

This year, I am working on a host computer industrial control WPF project. I will make a small summary and try again later.

Please do not spray with blood. I'm just a cainiao. ___ by Bao

 

It is similar to this; it generally means that by changing the value of a code variable, the circle color bound to this variable is also changing, which is a heartbeat effect.

I don't feel much about triggering data on the Internet. I have spent a lot of time. Here is a summary.

1: Notification

class NotifyBase : INotifyPropertyChanged    {        public event PropertyChangedEventHandler PropertyChanged;        public void OnPropertyChanegd(string propertyName)        {            if (PropertyChanged != null)            {                this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));            }        }    }

class NotifyModels:NotifyBase     {        private bool heartBeat;        public bool HeartBeat        {            get { return heartBeat; }            set { heartBeat = value;            OnPropertyChanegd("HeartBeat");            }        }            }

The first one does not need to be said. The base class of the notification,

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

2: rectangular code

This data triggerBinding = "{Binding HeartBeat }"Bind the background DataContext heartbeat

Change the corresponding style. I use the bool type, so the True/False type is used. It can be seen similar to the int type.

 <Ellipse x:Name="ellStatus"  VerticalAlignment="Center" HorizontalAlignment="Center"     MinHeight="50" MinWidth="50" MaxHeight="50" MaxWidth="50"  >            <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: Background code

Use a timer to change the value in the notification.

Assigned

EllStatus. DataContext=Models;
It's done.

public partial class MainWindow : Window    {        NotifyModels models;        private System.Timers.Timer timer;        public MainWindow()        {            InitializeComponent();            models = new NotifyModels();            ellStatus.DataContext = models;             timer = new System.Timers.Timer(1000);            timer.Elapsed += new System.Timers.ElapsedEventHandler(timer_Elapsed);            timer.Enabled = true;        }        void timer_Elapsed(object sender, System.Timers.ElapsedEventArgs e)        {            models.HeartBeat = !models.HeartBeat;        }