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我剛學與MEF MVVM並且已經看到了好處，但我有點困惑的一些實施細節的通用接口。我正在構建的應用程序有幾個與不同實體（WCF RIA Services公開實體框架對象）相同的模型，我希望避免爲每個需要的視圖實現類似的界面/模型，以下是我所擁有的拿出來雖然目前不起作用。重構多個接口使用MVVM，MEF和Silverlight4
常見的接口具有實現基本模型中的每個模型的新完成的事件，這是我能實現一個共同的類，因爲編譯器不喜歡從孩子鑄造基類型的最簡單方法。
的代碼，因爲它目前是編譯和運行，但是在通入[ImportingConstructor]爲FaqViewModel類空IModel。
我有如下定義，這應該熟悉那些誰見過肖恩Wildermuth的RIAXboxGames樣品的通用接口（簡化發佈）。
public interface IModel
{
void GetItemsAsync();
event EventHandler<EntityResultsArgs<faq>> GetFaqsComplete;
}
實現接口甲基方法
public class ModelBase : IModel
{
public virtual void GetItemsAsync() { }
public virtual event EventHandler<EntityResultsArgs<faq>> GetFaqsComplete;
protected void PerformQuery<T>(EntityQuery<T> qry, EventHandler<EntityResultsArgs<T>> evt) where T : Entity
{
Context.Load(qry, r =>
{
if (evt == null) return;
try
{
if (r.HasError)
{
evt(this, new EntityResultsArgs<T>(r.Error));
}
else if (r.Entities.Count() > 0)
{
evt(this, new EntityResultsArgs<T>(r.Entities));
}
}
catch (Exception ex)
{
evt(this, new EntityResultsArgs<T>(ex));
}
}, null);
}
private DomainContext _domainContext;
protected DomainContext Context
{
get
{
if (_domainContext == null)
{
_domainContext = new DomainContext();
_domainContext.PropertyChanged += DomainContext_PropertyChanged;
}
return _domainContext;
}
}
void DomainContext_PropertyChanged(object sender, System.ComponentModel.PropertyChangedEventArgs e)
{
switch (e.PropertyName)
{
case "IsLoading":
AppMessages.IsBusyMessage.Send(_domainContext.IsLoading);
break;
case "IsSubmitting":
AppMessages.IsBusyMessage.Send(_domainContext.IsSubmitting);
break;
}
}
}
實現該基本模型
[Export(ViewModelTypes.FaqViewModel, typeof(IModel))]
public class FaqModel : ModelBase
{
public override void GetItemsAsync()
{
PerformQuery(Context.GetFaqsQuery(), GetFaqsComplete);
}
public override event EventHandler<EntityResultsArgs<faq>> GetFaqsComplete;
}
視圖模型
[PartCreationPolicy(CreationPolicy.NonShared)]
[Export(ViewModelTypes.FaqViewModel)]
public class FaqViewModel : MyViewModelBase
{
private readonly IModel _model;
[ImportingConstructor]
public FaqViewModel(IModel model)
{
_model = model;
_model.GetFaqsComplete += Model_GetFaqsComplete;
_model.GetItemsAsync(); // Load FAQS on creation
}
private IEnumerable<faq> _faqs;
public IEnumerable<faq> Faqs
{
get { return _faqs; }
private set
{
if (value == _faqs) return;
_faqs = value;
RaisePropertyChanged("Faqs");
}
}
private faq _currentFaq;
public faq CurrentFaq
{
get { return _currentFaq; }
set
{
if (value == _currentFaq) return;
_currentFaq = value;
RaisePropertyChanged("CurrentFaq");
}
}
public void GetFaqsAsync()
{
_model.GetItemsAsync();
}
void Model_GetFaqsComplete(object sender, EntityResultsArgs<faq> e)
{
if (e.Error != null)
{
ErrorMessage = e.Error.Message;
}
else
{
Faqs = e.Results;
}
}
}
然後終於Silverlight的模型查看本身
public partial class FrequentlyAskedQuestions
{
public FrequentlyAskedQuestions()
{
InitializeComponent();
if (!ViewModelBase.IsInDesignModeStatic)
{
// Use MEF To load the View Model
CompositionInitializer.SatisfyImports(this);
}
}
[Import(ViewModelTypes.FaqViewModel)]
public object ViewModel
{
set
{
DataContext = value;
}
}
}