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저는 Caliburn.Micto를 내 WPF 응용 프로그램 용 MVVM 프레임 워크로 사용하고 주입 용 MEF로 사용합니다. 내 응용 프로그램의IoC-MEF 주입 문제
UML과 같이 : http://i54.tinypic.com/2n1b4mx.png
내 시나리오입니다 : 내가보기 모델-1에서 만든 (프로젝트에 LogOnViewModel)를 새로운 뷰 - 모델-2 쉘 (내 프로젝트에 MessengerViewModel입니다) -view-model 방법.
view-model-1의 객체를 view-model-2의 생성자에 전달해야합니다.
나는 boostraper 클래스에서로드 된 외부 어셈블리에서 주입 클래스에 MEF를 사용합니다. 내 쉘 - 뷰 - 모델이 공장 클래스를 사용
/// <summary>
/// Factory interfaces
/// </summary>
public interface IViewModelFactory
{
ILogOnViewModel CreateLogOnViewModel(IShellViewModel shellViewModel);
IMessengerViewModel CreateMessengerViewModel(IShellViewModel shellViewModel, PokecAccount account);
}
/// <summary>
/// Concrent implementation of factory
/// </summary>
[Export(typeof(IViewModelFactory))]
public class DefaulFactoryViewModel:IViewModelFactory
{
#region Implementation of IViewModelFactory
//create start up view-model
public ILogOnViewModel CreateLogOnViewModel(IShellViewModel shellViewModel)
{
return new LogOnViewModel(shellViewModel);
}
//this method create new view model
//it is used in LogOnViewModel
public IMessengerViewModel CreateMessengerViewModel(IShellViewModel shellViewModel, PokecAccount account)
{
return new MessengerViewModel(shellViewModel, account);
}
}
: 여기에 내가 추상 팩토리 패턴을 사용하여 새 뷰 - 모델의 생성에
내 구현입니다. Shell-view-model 클래스는 다음과 같습니다.
/// <summary>
/// Shell model interface
/// </summary>
public interface IShellViewModel
{
//create start up view-model
void ShowLogOnView();
//this method create new view model
//it is used in LogOnViewModel
void ShowMessengerView(PokecAccount account);
}
[Export(typeof(IShellViewModel))]
public class ShellViewModel : Conductor<IScreen>, IShellViewModel
{
//factory interface
private readonly IViewModelFactory _factory;
[ImportingConstructor]
public ShellViewModel(IViewModelFactory factory)
{
//inject factory
_factory = factory;
//show startup view model
ShowLogOnView();
}
public void ShowLogOnView()
{
//create LogOnViewModel class with factory
var model = _factory.CreateLogOnViewModel(this);
ActivateItem(model);
}
/// <summary>
/// Create MessengerViewModel
/// </summary>
/// <param name="account">account in this case is send from LogOnViewModel class </param>
public void ShowMessengerView(PokecAccount account)
{
//create MessengerViewModel class with factory
var model = _factory.CreateMessengerViewModel(this, account);
ActivateItem(model);
}
}
}
시작 모델보기. LogOnViewModel 클래스 :
public interface ILogOnViewModel : IScreen, IDataErrorInfo
{
string Nick { get; set; }
string Password { get; set; }
bool CanLogOn { get; set; }
void LogOn(string nick, string password);
}
public class LogOnViewModel : Screen, ILogOnViewModel
{
/// <summary>
/// inject class from external assembly
/// after creation of this class is still null
/// </summary>
[Import]
public IPokecConnection PokecConn { get; set; }
private readonly IShellViewModel _shellViewModel = null;
private PokecAccount _account = null;
public LogOnViewModel(IShellViewModel shellViewModel)
{
_shellViewModel = shellViewModel;
_account = new PokecAccount();
}
//CREATE NEW VIEW MODEL
public void CreateNewView()
{
//create new view-model (MessengerViewModel)
_shellViewModel.ShowMessengerView(_account);
}
}
MessengerViewModel 클래스 :
public interface IMessengerViewModel : IScreen
{
BitmapImage AvatarImage { get; set; }
string AvatarStatus { get; set; }
KeyValuePair<string, Friend> SelectedFriend { get; set; }
}
public class MessengerViewModel : Screen, IMessengerViewModel
{
[Import]
private IPokecService _pokecService;
[Import]
private IPokecConnection _pokecConn;
private IShellViewModel _shellViewModel = null;
private PokecAccount _account = null;
public MessengerViewModel(IShellViewModel shellViewModel, PokecAccount account)
{
_shellViewModel = shellViewModel;
_account = account;
}
}
내가보기 모델 클래스에 주입에 문제가 있습니다. 뷰 모델 클래스를 만들 때 factory 패턴을 사용하지만 외부 어셈블리에서도이 클래스에 주입해야합니다.
예 : LogOnVieModel 클래스 생성 후 IPokecConnection입니다. PokecConn {get; 설정;} 여전히 null입니다.
내 경우 가장 적합한 솔루션은 무엇입니까? 문제가 어디에 있습니까? 도와 줘서 고마워.