这篇msdn文章是否违反了mvvm?

这可能是个老新闻,但在2009年3月,这篇文章 Model-View-ViewModel In Silverlight 2 Apps ,的代码示例包括 DataServiceEntityBase :

// COPIED FROM SILVERLIGHTCONTRIB Project for simplicity

/// <summary>
/// Base class for DataService Data Contract classes to implement 
/// base functionality that is needed like INotifyPropertyChanged.  
/// Add the base class in the partial class to add the implementation.
/// </summary>
public abstract class DataServiceEntityBase : INotifyPropertyChanged
{
/// <summary>
/// The handler for the registrants of the interface's event 
/// </summary>
PropertyChangedEventHandler _propertyChangedHandler;

/// <summary>
/// Allow inheritors to fire the event more simply.
/// </summary>
/// <param name="propertyName"></param>
protected void FirePropertyChanged(string propertyName)
{
  if (_propertyChangedHandler != null)
  {
    _propertyChangedHandler(this, new PropertyChangedEventArgs(propertyName));
  }
}

#region INotifyPropertyChanged Members
/// <summary>
/// The interface used to notify changes on the entity.
/// </summary>
event PropertyChangedEventHandler INotifyPropertyChanged.PropertyChanged
{
  add
  {
    _propertyChangedHandler += value;
  }
  remove
  {
    _propertyChangedHandler -= value;
  }
}
#endregion

这个类意味着开发人员 打算 绑定视觉效果 直接地 to data(是的,使用了viewmodel,但是它定义了 ObservableCollection 数据对象)。这种设计是否偏离了mvvm的指导?现在我明白了为什么我们要这样做的一些原因:我们能做什么 数据服务实体库 这类事情(与实体框架密切相关)是吗?

// Partial Method to support the INotifyPropertyChanged interface
public partial class Game : DataServiceEntityBase
{
    #region Partial Method INotifyPropertyChanged Implementation
    // Override the Changed partial methods to implement the 
    // INotifyPropertyChanged interface

    // This helps with the Model implementation to be a mostly
    // DataBound implementation

    partial void OnDeveloperChanged() { base.FirePropertyChanged("Developer"); }
    partial void OnGenreChanged() { base.FirePropertyChanged("Genre"); }
    partial void OnListPriceChanged() { base.FirePropertyChanged("ListPrice"); }
    partial void OnListPriceCurrencyChanged() { base.FirePropertyChanged("ListPriceCurrency"); }
    partial void OnPlayerInfoChanged() { base.FirePropertyChanged("PlayerInfo"); }
    partial void OnProductDescriptionChanged() { base.FirePropertyChanged("ProductDescription"); }
    partial void OnProductIDChanged() { base.FirePropertyChanged("ProductID"); }
    partial void OnProductImageUrlChanged() { base.FirePropertyChanged("ProductImageUrl"); }
    partial void OnProductNameChanged() { base.FirePropertyChanged("ProductName"); }
    partial void OnProductTypeIDChanged() { base.FirePropertyChanged("ProductTypeID"); }
    partial void OnPublisherChanged() { base.FirePropertyChanged("Publisher"); }
    partial void OnRatingChanged() { base.FirePropertyChanged("Rating"); }
    partial void OnRatingUrlChanged() { base.FirePropertyChanged("RatingUrl"); }
    partial void OnReleaseDateChanged() { base.FirePropertyChanged("ReleaseDate"); }
    partial void OnSystemNameChanged() { base.FirePropertyChanged("SystemName"); }
    #endregion
}

当然,出于教育目的,msdn代码可以被看作是“玩具代码”,但是是否有人在 真实的 Silverlight开发的世界?