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Utility.PropertyNotifications 2.0.1

[](https://www.nuget.org/packages/Utility.PropertyNotifications)


# Utility PropertyNotifications

- Simplifies raising **INotifyPropertyChanged** events with helper methods [e.g RaisePropertyChanged<T>(ref T field, T value, [CallerMemberName] string propertyName = null)]

that sit inside the get/set brackets and handle value comparison and updates

- Simplifies subscribing to **INotifyPropertyChanged** events with customisable extension methods [e.g WithChangesTo] that (combined with ReactiveEx) can be used for neat subscriptions

- Adds two other interfaces, **INotifyPropertyCalled** and **INotifyPropertyReceived**, with methods comparable to those for INotifyPropertyChanged for greater control over reacting to property getting/setting

- Includes, NotifyPropertyClass - Base class providing methods for raising, calling, and receiving data changes

- Leverages CallerMemberName attribute to avoid string literals

- .NET Standard 2.0

## Example

  public class MainViewModel : NotifyPropertyClass

  {

  private string _someProperty;

  private string _otherProperty;

  public string SomeProperty

  {

  get

  {

  RaisePropertyCalled(_someProperty);

  return _someProperty;

  }

  set ⇒ RaisePropertyReceived(ref _someProperty, value);

  }

  public string OtherProperty

  {

  get ⇒ _otherProperty;

  set ⇒ RaisePropertyChanged(ref _otherProperty, value);

  }

  }

  using System;

  using System.Reactive;

  using System.Reactive.Linq;

  public class Service

  {

  public Service(MainViewModel mainViewModel, IDataStore dataStore)

  {

  mainViewModel

  .WithChangesTo(a ⇒ a.OtherProperty, includeNulls: false, includeInitialValue: true, includeDefaultValues: true)

  .CombineLatest(mainViewModel.WithChangesTo(a ⇒ a.SomeProperty))

  .Subscribe(o ⇒

  {

  Console.WriteLine(o.First + o.Second);

  });

  mainViewModel

  .WhenReceivedFrom(a ⇒ a.SomeProperty, includeNulls: true, includeInitialValue: false, includeDefaultValues: true)

  .Subscribe(value ⇒

  {

  if (value == "name")

  {

  mainViewModel.RaisePropertyChanged(nameof(MainViewModel.SomeProperty));

  }

  });

  mainViewModel

  .WhenCalledFrom(a ⇒ a.SomeProperty)

  .Subscribe(async o ⇒

  {

  var value = await dataStore.Value<string>(nameof(MainViewModel.SomeProperty));

  mainViewModel.SomeProperty = value;

  });

  }

  }

  public interface IDataStore

  {

  Task<T> Value<T>(string name);

  }