Using string constant for notify property changed

Question

I am working with some existing code and trying to figure out the advantage (if any) of using a string constant for the name of a property when implementing INotifyPropertyC

Answer 1

Both versions are equally prone to typing errors.

If you have a somewhat recent version of .NET, your property changed handler should look like this:

protected virtual void OnPropertyChanged([CallerMemberName] string propertyName = null)
{
  var handler = this.PropertyChanged;
  if (handler != null)
  {
    handler(this, new PropertyChangedEventArgs(propertyName));
  }
}

Then your property looks like this:

private int _customerId;
public int CustomerId
{
    get
    {
         return _customerId;
    }
    set
    {
         if (_cusomterId != value)
         {
              _customerId = value;
              this.OnPropertyChanged();
         }
    }
}

And you don't have any trouble with typing errors.