WPF 自定义NotifyPropertyChanged

该工具类实现INotifyPropertyChanged接口

    /// <summary>
    /// 实现了属性更改通知的基类
    /// </summary>
    public class BaseNotifyPropertyChanged : System.ComponentModel.INotifyPropertyChanged
    {
        /// <summary>
        /// 属性值变化时发生
        /// </summary>
        /// <param name="propertyName"></param>
        protected virtual void OnPropertyChanged(string propertyName)
        {
            if (this.PropertyChanged != null)
                this.PropertyChanged(this, new System.ComponentModel.PropertyChangedEventArgs(propertyName));
        }

        /// <summary>
        /// 属性值变化时发生
        /// </summary>
        /// <param name="propertyName"></param>
        protected virtual void OnPropertyChanged<T>(Expression<Func<T>> propertyExpression)
        {
            var propertyName = (propertyExpression.Body as MemberExpression).Member.Name;
            this.OnPropertyChanged(propertyName);
        }

        public virtual event System.ComponentModel.PropertyChangedEventHandler PropertyChanged;
    }

使用时继承此类，然后在VM中的属性get使用:OnPropertyChanged(()=>PropertyName)  ??难道不是应该Set