Tuesday, 30 April 2013

INotifyPropertyChanged Interface and PropertyChangedEventHandler in WPF


INotifyPropertyChanged Interface and PropertyChangedEventHandler in WPF

The INotifyPropertyChanged interface is used to notify clients, typically binding clients, which a property value has changed. The INotifyPropertyChanged interface contains an event called PropertyChanged. Whenever a property on a ViewModel / Model  object has a new value, it can raise the PropertyChanged event to notify the WPF binding system of the new value. Upon receiving that notification, the binding system queries the property, and the bound property on some UI element receives the new value

public class MyClass:INotifyPropertyChanged
{
    private int _ID;
    private string _Name;

    public event PropertyChangedEventHandler PropertyChanged;
    private void OnPropertyChanged(string propertyName)
    {
        if (PropertyChanged != null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    public int ID
    {
        get
        {
            return _ID;
        }
        set
        {
            _ID = value;
            OnPropertyChanged("ID");
        }
    }
    public string Name
    {
        get
        {
            return _Name;
        }
        set
        {
            _Name = value;
            OnPropertyChanged("Name");
        }
    }
}

No comments:

Post a Comment