Implementing INotifyPropertyChanged - does a better way exist?

Question

Microsoft should have implemented something snappy for INotifyPropertyChanged, like in the automatic properties, just specify {get; set; notify;} I

Answer 1

Whilst there are obviously lots of ways to do this, with the exception of the AOP magic answers, none of the answers seem to look at setting a Model's property directly from the view model without having a local field to reference.

The issue is you can't reference a property. However, you can use an Action to set that property.

protected bool TrySetProperty(Action property, T newValue, T oldValue, [CallerMemberName] string propertyName = null)
{
    if (EqualityComparer.Default.Equals(oldValue, newValue))
    {
        return false;
    }

    property(newValue);
    RaisePropertyChanged(propertyName);
    return true;
}

This can be used like the following code extract.

public int Prop {
    get => model.Prop;
    set => TrySetProperty(x => model.Prop = x, value, model.Prop);
}

Check out this BitBucket repo for a full implementation of the method and a few different ways of achieving the same result, including a method that uses LINQ and a method that uses reflection. Do note that these methods are slower performance wise.