Handy Extensions for INotifyPropertyChanged
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Handy Extensions for INotifyPropertyChanged

This repository contains handy extension methods for classes implementing INotifyPropertyChanged (aka INPC). To start add the following to the top of your C# code:

using NotifyPropertyChangedExtensions;

How to easily raise INPC in a refactor friendly way

public class MyClass : INotifyPropertyChanged
    private int _number;

    public int Number
        get { return _number; }
            if(_number != value)
                _number = value; 
                this.RaisePropertyChanged(() => Number); 

    public event PropertyChangedEventHandler PropertyChanged;

How to easily handle (listen to) INPC in a refactor friendly way

MyClass myObject = ...;

myObject.HandleOnPropertyChanged(src => src.Number, sender =>
        Console.WriteLine("Number changed to {0}", sender.Number);

How to do one-way binding from a class that implements INPC

var source = new MyClass();
var target = new TargetClass();

source.BindProperty(src => src.Number, target, t => t.Num);

source.Number = 10;
Console.WriteLine(target.Num); // 10

You can negate a boolean property while binding it. I use it a lot and find it very handy.

source.BindProperty(src => src.IsActive, target, t => !t.IsDeleted);

source.IsActive = false;
Console.WriteLine(target.IsDeleted); // True

You can bind primitive data-types in source class to Nullable primitive data-types in the target class, and vice versa.

source.BindProperty(src => src.Number, target, t => t.NullableNumber);

What happens if source is null, and the target is not Nullable?

The default behavior is to update target with default value of that type:

target.Number = 10;
source.BindProperty(src => src.NullableNumber, target, t => t.Number);

source.NullableNumber = null;
Console.WriteLine(target.Number); // 0

You can also choose not to update target if source becomes null:

target.Number = 10;
source.BindProperty(src => src.NullableNumber, target, t => t.Number, 

source.NullableNumber = null;
Console.WriteLine(target.Number); // still 10

How can I find more information about this library?

At the moment the best way to find out how this library works is by reading the unit tests or at least their titles.