SilverlightShow: Tip: How to implement INotifyPropertyChanged interface? Comments

RE: Tip: How to implement INotifyPropertyChanged interface?

( DanaH) — Tue, 22 Dec 2009 14:22:05 +0300

Hi i have problem with using timer in my slApp, i have textbox and bind its text to property of object which is in page.datacontext

first time i see the value of this property, but if i try to change it in the method calld when timer elapsed, it isnt in textbox.

public class vm
    {
        string s = "nejakyString";
        public event EventHandler SChanged;
        public string S
        {
            get { return s; }
            set { s = value;
                raiseEventPropertyChanged("S");
            }
        } public class vm
    {
        string s = "nejakyString";
        public event EventHandler SChanged;
        public string S
        {
            get { return s; }
            set { s = value;
                raiseEventPropertyChanged("S");
            }
        }
public event PropertyChangedEventHandler PropertyChanged;
        private void raiseEventPropertyChanged(string propertyName)
        {
          if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
           }

Page.xaml.cs

            TimerCallback timerDelegate =
                new TimerCallback(elapsed);

            vievModel = new vm();
            this.DataContext = vievModel;

public void elapsed(Object stateInfo)
{vievModel.S += DateTime.Now.ToString();}

Page.xaml

thanks for helping me.

RE: Tip: How to implement INotifyPropertyChanged interface?

( iiordanov) — Sun, 08 Nov 2009 12:07:26 +0300

Nice addition Fizz, thanks :)

RE: Tip: How to implement INotifyPropertyChanged interface?

( Fizz) — Sun, 08 Nov 2009 00:33:22 +0300

Be Safe

protected virtual void OnPropertyChanged(PropertyChangedEventArgs e)
{
    PropertyChangedEventHandler eventHandler = this.PropertyChanged;
    if (eventHandler != null)
    {
        eventHandler(this, e);
    }
}

RE: Tip: How to implement INotifyPropertyChanged interface?

( Huisman) — Wed, 28 Oct 2009 13:43:28 +0300

Is it possible to:
define a class on my wcf-service with an INotifyPropertyChanged and then I contact the wcf-service with Silverlight and create a new instance of this class and then using a timer, I will update the information in this object using an Timer and when the information changes, the interface also changes automaticaly. Or is the INotifyPropertyChanged propety not stirallizable?

Thanks

RE: Tip: How to implement INotifyPropertyChanged interface?

( Sriram) — Thu, 10 Sep 2009 08:38:43 +0300

Awesome stuff man. Helped me a lot. Thanks

RE: Tip: How to implement INotifyPropertyChanged interface?

( Tapani) — Wed, 08 Oct 2008 06:11:49 +0300

If you define event this way:

public event PropertyChangedEventHandler PropertyChanged = delegate { };

then you can remove the if-clause from OnPropertyChanged.