Monitor a change in property

Question

I have 2 properties to a class (WPF control): HorizontalOffset and VerticalOffset (both public Double's). I would like to call a method whenever these properties change. How can I do this? I know of one way - but I'm pretty sure it's not the right way (using a DispatcherTimer of very short tick intervals to monitor the property).

EDIT FOR MORE CONTEXT:

These properties belong to a telerik scheduleview control.

Answer 1

Leverage the INotifyPropertyChanged interface implementation of the control.

If the control is called myScheduleView:

//subscribe to the event (usually added via the designer, in fairness)
myScheduleView.PropertyChanged += new PropertyChangedEventHandler(
  myScheduleView_PropertyChanged);

private void myScheduleView_PropertyChanged(Object sender,
  PropertyChangedEventArgs e)
{
  if(e.PropertyName == "HorizontalOffset" ||
     e.PropertyName == "VerticalOffset")
  {
    //TODO: something
  }
}

Answer 2

I know of one way ... DispatcherTimer

Wow avoid that :) INotifyPropertyChange interface is your friend. See the msdn for samples.

You basically fire an event(usually called onPropertyChanged) on the Setter of your properties and the subscribers handle it.

an example implementation from the msdn goes:

// This is a simple customer class that 
// implements the IPropertyChange interface.
public class DemoCustomer  : INotifyPropertyChanged
{
    public event PropertyChangedEventHandler PropertyChanged;    
    private void NotifyPropertyChanged(String info)
    {
        if (PropertyChanged != null)
          PropertyChanged(this, new PropertyChangedEventArgs(info));            
    }

    public string CustomerName
    {
        //getter
        set
        {
            if (value != this.customerNameValue)
            {
                this.customerNameValue = value;
                NotifyPropertyChanged("CustomerName");
            }
        }
    }
}