我想大部分的WPF和SL开发者都应该对INotifyPropertyChanged这个接口再熟悉不过了。

#region Copyright PwC GDC Sep. 2010
//
// All rights are reserved. Reproduction or transmission in whole or in part, in
// any form or by any means, electronic, mechanical or otherwise, is prohibited
// without the prior written consent of the copyright owner.
//
// Author:John Shao Sep.20.2010
//
#endregion

using System.ComponentModel;

namespace PwC.FCPA.ViewModel
{
    /// <summary>
    /// ViewModel base class and implement INotifyPropertyChanged interface
    /// </summary>
    public abstract class ViewModelBase : INotifyPropertyChanged
    {
        #region INotifyPropertyChanged
        /// <summary>
        /// Property Change Event
        /// </summary>
        public event PropertyChangedEventHandler PropertyChanged;

        /// <summary>
        /// Implement INotifyPropertyChanged's function, when binding data in UI control
        /// this function will invoke PropertyChanged event.
        /// </summary>
        /// <param name="propertyName">Property Name</param>
        public virtual void NotifyPropertyChanged(string propertyName)
        {
            if (PropertyChanged != null)
            {
                PropertyChanged(this, new PropertyChangedEventArgs(propertyName));
            }
        }
        #endregion
    }
}

　　当我们向UI传递属性变化的通知并更新客户端UI时就必须应用到它。（这里插一句，当一个集合中的项改变时我们则需要使用ObservableCollection<T>泛型集合）