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INotifyPropertyChanged.PropertyChanged event

Occurs when a property value changes.

Syntax


event PropertyChangedEventHandler^ PropertyChanged {
   Windows::Foundation::EventRegistrationToken add(PropertyChangedEventHandler^ value);
   void remove(Windows::Foundation::EventRegistrationToken token);
}

Event information

Delegate	PropertyChangedEventHandler

Remarks

When building Windows Store apps with the Microsoft .NET Framework, this interface is hidden and developers should use the System.ComponentModel.INotifyPropertyChanged interface.

The PropertyChanged event can indicate that all properties on the object have changed by using String.Empty for the PropertyName property of the PropertyChangedEventArgs. Note that you cannot use null (Nothing in Visual Basic) for this like you can in Windows Presentation Foundation (WPF) and Microsoft Silverlight.

Examples

This example demonstrates how to implement the INotifyPropertyChanged interface and raise the PropertyChanged event whenever property values change. For the complete code listing, see the XAML data binding sample.


using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Linq;
using System.Text;
using System.Threading.Tasks;

namespace DataBinding
{
    public class Employee : INotifyPropertyChanged 
    {
        private string _name;
        private string _organization;

        public string Name
        {
            get { return _name; }
            set
            {
                _name = value;
                RaisePropertyChanged("Name");
            }
        }

        public string Organization
        {
            get { return _organization; }
            set
            {
                _organization = value;
                RaisePropertyChanged("Organization");
            }
        }


        public event PropertyChangedEventHandler PropertyChanged;
        protected void RaisePropertyChanged(string name)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(name));
            }
        }
    }
}

Requirements