CODEWITHSUNDEEP
c#wpftabcontrol
Harald S. Hanssen
Harald S. Hanssen

Reputation: 494

Add event to wpf controller when a property value changes

I have a property 

public sealed partial class Computer
{
    private bool _online;
    public bool Online
    {
        get { return _online; }
        set
        {
            _online = value;
            RaiseProperty("Online");
        }
    }
 }

Which raises an event of type INotifyPropertyChanged 

public sealed partial class Computer : INotifyPropertyChanged
{
  public event PropertyChangedEventHandler PropertyChanged;

    private void RaiseProperty(string propertyName)
    {
        if (this.PropertyChanged != null)
        {
            this.PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }
 }

My question is, how can I add an additional event telling in this case an TabControl to run a specific method each time the Online Property changes?

Upvotes: 4

Views: 8213

Answers (2)

chopikadze
chopikadze

Reputation: 4239

public sealed partial class Computer
{
    // This event is fired every time when Online is changed
    public event EventHandler OnlineChanged;

    private bool _online;
    public bool Online
    {
        get { return _online; }
        set
        {
            // Exit if online value isn't changed
            if (_online == value) return;

            _online = value;
            RaiseProperty("Online");

            // Raise additional event only if there are any subscribers
            if (OnlineChanged != null)
                OnlineChanged(this, null);
        }
    }
}

You can use this event like:

Computer MyComputer = new MyComputer();
MyComputer.OnlineChanged += MyComputer_OnlineChanged;

void MyComputer_OnlineChanged(object sender, EventArgs e)
{
    Computer c = (Computer)c;
    MessageBox.Show("New value is " + c.Online.ToString());
}

Upvotes: 1

Rachel
Rachel

Reputation: 132558

You need to register a method to the PropertyChanged event

MyComputer.PropertyChanged += Computer_PropertyChanged;

void Computer_PropertyChanged(object sender, PropertyChangedEventArgs e)
{
    if (e.PropertyName == "Online")
    {
        // Do Work
    }
}

Upvotes: 4

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