/// <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;

    }