C# Class Implementation of INotifyPropertyChanged

A simple C# class implementing INotifyPropertyChanged:
INotifyPropertyChanged implements one event:

//Event raised anytime a property on the object changes.

public event PropertyChangedEventHandler PropertyChanged;

which is raised anytime a property on the object is changed.

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With the class, include a helper function to handle any change with any object property. It can be name any generic name. When raised, it is passed the proptery name as a string.

//Write a helper function

public void OnPropertyChanged(string propertyName)

{

    //Anyone listening?

    if (PropertyChanged != null)

    {

        //Raise the event

        PropertyChanged(this, new PropertyChangedEventArgs(propertyName));

    }

}

Raise the event in any property within the object.

public double password

{

    get { return _password; }

    set

    {

        if (value != _password)

        {

            _password = value;

            //Will raise the PropertyChanged event.

            OnPropertyChanged("password");

        }

    }

}

Now, when anytime an object’s property changes, the PropertyChanged will be fired.

Complete code below:

public class Person : INotifyPropertyChanged

{

    private double _password;

    public string username { get; set; }

    public double password

    {

        get { return _password; }

        set

        {

            if (value != _password)

            {

                _password = value;

                //Will raise the PropertyChanged event.

                OnPropertyChanged("password");

            }

        }

    }

    //Event raised anytime a property on the object changes.

    public event PropertyChangedEventHandler PropertyChanged;

    //Write a helper function

    public void OnPropertyChanged(string propertyName)

    {

        //Anyone listening?

        if (PropertyChanged != null)

        {

            //Raise the event

            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));

        }

    }

}