[WPF] MVVM ObservableObject 구현하기

    public class ObservableObject : INotifyPropertyChanged
    {
        public event PropertyChangedEventHandler PropertyChanged = delegate { };

        protected virtual void RaisePropertyChangedEvent([CallerMemberName] string propertyName = null)
        {
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }

        protected virtual void SetProperty<T>(ref T member, T val, [CallerMemberName] string propertyName = null)
        {
            if (object.Equals(member, val)) return;

            member = val;
            PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
        }
    }

    
    public class ViewModelBase : ObservableObject
    {
        public virtual bool IsInDesignMode()
        {
#if WINDOWS_PHONE_APP
            if (DesignerProperties.IsInDesignTool)
            {
              return true;
            }
            else
            {
              return false;
            }
#else
            if (DesignerProperties.GetIsInDesignMode(new System.Windows.DependencyObject()))
            {
                return true;
            }
            else
            {
                return false;
            }
#endif
        }
    }