How to raise PropertyChanged event without using string name

Question

It would be good to have ability to raise \'PropertyChanged\' event without explicit specifying the name of changed property. I would like to do something like this:

Answer 1

I´m using the extension method

public static class ExpressionExtensions {
    public static string PropertyName(this Expression> projection) {
        var memberExpression = (MemberExpression)projection.Body;

        return memberExpression.Member.Name;
    }
}

in combination with the following method. The method is defined in the class that implements the INotifyPropertyChanged interface (Normally a base class from which my other classes are derived).

protected void OnPropertyChanged(Expression> projection) {
    var e = new PropertyChangedEventArgs(projection.PropertyName());

    OnPropertyChanged(e);
}

Then i can raise the PropertyChanged-Event as follows

private double _rate;
public double Rate {
        get {
            return _rate;
        }
        set {
            if (_rate != value) {
              _rate = value;                     
              OnPropertyChanged(() => Rate );
            }
        }
    }

Using this approach, its easy to rename Properties (in Visual Studio), cause it ensures that the corresponding PropertyChanged call is updated too.