wcf – 这篇MSDN文章是否违反了MVVM？

// 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 property@R_874_8313@
{
  if (_propertyChangedHandler != null)
  {
    _propertyChangedHandler(this,new PropertyChangedEventArgs(property@R_874_8313@);
  }
}

#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将视觉直接绑定到数据(是的,使用viewmodel但是它定义了数据对象的ObservableCollection).这种设计是否偏离了MVVM的指导？现在我可以看到一些原因为什么我们这样做：我们可以用DataserviceEntityBase做什么就是这种事情(与Entity Framework很亲密)：

// 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,MSDN代码可以被视为用于教育目的的“玩具代码”,但是在Silverlight开发的现实世界中,是否有人在做这样的事情？