Tips: Save some typing when binding values to UI in WPF/Silverlight

As we all know, In WPF or Silverlight application, if we want to update the value in the UI when the underlying data has changed, the class need to implement the "INotifyPropertyChanged” interface, which contains one delegate "PropertyChangedEventHandler”.

So create a new method, and take the incoming parameter and pass it to the event argument, make sure call the method every time when the property has changed. just like the standard textbook said.

How about create that method this way:

Import System.Runtime.CompilerServices namespace.

 

        public event PropertyChangedEventHandler PropertyChanged;

        private void OnPropertyChanged([CallerMemberName]string caller = "")

        {

            if (PropertyChanged != null)

            {

                PropertyChanged(this, new PropertyChangedEventArgs(caller));

            }

        }

 

With [CallerMemberName] attribute, you don’t have to explicit pass in the property name anymore, just call it in the set part, Framework will take care of the rest. like this:

        private string _foo;

        public string Foo

        {

            get

            {

                return _foo

            }

            set

            {

                _foo= value;

                OnPropertyChanged();

            }

        }

It’s not some big or fancy things, but maybe your keyboard will live longer.