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• Passing ASP.NET User by Dependency Injection

  - by UpTheCreek

  In my web application I have various components that need to access the currently authenticated user (HttpContext.User). There are two obvious ways a component can access this: 1) Accessing getting the User from HttpContext.Current 2) Passing the user around in constructors Is not ideal because it makes testing difficult and ties application components to web concerns, when they really shouldn't know about it. Is just messy and complicates everything. So I've been thinking about passing in the current user (or perhaps just the name/id) to any component that needs it using an IoC container (via dependency injection). Is anyone using this technique to supply the current ASP.NET user to parts of the application? Or, Does this sound like a sensible approach? I would like know how this has worked out for people. Thanks

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• StructureMap 'conditional singleton' for Lucene.Net IndexReader

  - by Gareth D

  I have a threadsafe object that is expensive to create and needs to be available through my application (a Lucene.Net IndexReader). The object can become invalid, at which point I need to recreate it (IndexReader.IsCurrent is false, need a new instance using IndexReader.Reopen). I'd like to able to use an IoC container (StructureMap) to manage the creation of the object, but I can't work out if this scenario is possible. It feels like some kind of "conditional singleton" lifecycle. Does StructureMap provide such a feature? Any alternative suggestions?

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• Doesn't Spring really support Interface injection at all?

  - by mrCoder

  Hi I know that Spring doesn't supports Interface injection and I've read that many a times. But today as I came across an article about IOC by Martin Fowler (link), it seems using ApplicationContextAware in Spring is some what similar to the Interface injection. when ever Spring' context reference is required in our Spring bean, we'll implement ApplicationContextAware and will implement the setApplicationContext(ApplicationContext context) method, and we'll include the bean in the config file. Is not this the same as Interface injection, where where telling the Spring to inject (or), say, pass the reference of the context into this bean? Or I m missing something here? Thanks for any information! ManiKanta

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• Castle Windsor and its own configuration file

  - by Coppermill

  I am using Castle Windsor for IoC, and have the configuration held in the web.config/app.config, using the following factory: public static TYPE Factory(string component) { var windsorContainer = new WindsorContainer(new XmlInterpreter()); var service = windsorContainer.Resolve<TYPE>(component); if (service == null) throw new ArgumentNullException(string.Format("Unable to find container {0}", component)); return service; } and my web.config looking like this: <configuration> <configSections> <section name="castle" type="Castle.Windsor.Configuration.AppDomain.CastleSectionHandler, Castle.Windsor"/> </configSections> <castle> <components> <component id="Data" service="Data.IData, Data" type="Data.DataService, Data"/> </components> </castle> <appSettings>....... Which works fine, but I'd like to place the configuration for Castle Windsor in a file called castle.config. How do I do this?

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• Defining reliable SIlverlight 4 architecture

  - by doteneter

  Hello everybody, It's my first question on SO. I know that there were many topics on Silverlight and architecture but didn't find answers that satisfies me. I'm ASP.NET MVC developer and are used to work on architectures built with the best practices (loose coupling with DI, etc.) Now I'm faced to the new Silverlight 4 project and would like to be sure I'm doing the best choices as I'm not experienced. Main features required by the applications are as follows : use existing SQL Server Database but with possibility to move to the cloud. using EF4 for the data acess with SQL Server. exitensibility : adding new modules without changing the main host. loose coupling. I was looking at different webcasts (Taulty, etc.), blogs about Silverlight and came up with the following architecture. EF 4 for data access (as specified with the requirements) WCF RIA Services for mid-tiers controling access to data for queries and enabling end-to-end support for data validation, authentication and roles. MEF Support for enabling modules. Unity 2.0 for DI. The problem is that I don't know how to define a reliable architecture where all these elements play well together. Should I use a framework instead like Prism or Caliburn? But for now I'm not sure what scenarios they support. What's the best usages for Unity in Silverlight ? I used to use IoC in ASP.NET MVC for loos coupling and other things like interception for audit logging. It seems that for Silverlight Unity doesn't support Interception. I would like to use it to enable loose coupling and to enable to move to the cloud if needed. Thanks in advance for your help.

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• Using Prism with Ninject

  - by stiank81

  Is anyone out there using the Prism framework with Ninject instead of Unity? I need some functionality Unity isn't supporting yet, and I've decided to switch the IoC container to Ninject. I'm struggling a bit with the replace though.. What I need to use from Prism is the EventAggregator and the RegionManager. I have seen this sample that actually does the replace, but this is written for an older version of Prism, and several of the classes seems to have changed etc. So I ended up all confused after looking doing some effort in trying to rewrite it. So - my question is basically: How can I replace Unity with Ninject? What are the necessary steps? Initially I assumed I could write a simple bootstrapper that creates and configures a Ninject container and uses this to resolve all other objects. I bind IEventAggregator to EventAggregator and IRegionManager to RegionManager, but it fails when creating the Shell and the RegionManager.CreateRegion is called. Problem is that it seems like I need to set a ServiceLocator somewhere as it fails on this line: IServiceLocator locator = ServiceLocator.Current; Any ideas and tips along the way?

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• OpenNETCF.Stopwatch -> only ticks changing, not Elapsed

  - by pithyless

  I've been trying to track down a bug I thought was thread-related, but I think instead there is an issue with the way I am using OpenNETCF's Stopwatch. I am using OpenNETCF.IoC in my application, but for the sake of simplicity I moved the following code directly into a view: public partial class WorkoutView : SmartPart { ... private Stopwatch stopwatch; public WorkoutView() { ... stopwatch = new Stopwatch(); stopwatch.Reset(); stopwatch.Start(); WorkoutDisplayTimer = new Timer(); WorkoutDisplayTimer.Interval = 500; WorkoutDisplayTimer.Tick += new EventHandler(WorkoutDisplayTimer_Tick); WorkoutDisplayTimer.Enabled = true; } void WorkoutDisplayTimer_Tick(object sender, EventArgs e) { ... stopwatch.Stop(); lbl.Text = stopwatch.ElapsedTicks.ToString() + "NOT WORKING: " + stopwatch.Elapsed.ToString(); stopwatch.Start(); } ... } Long story short, looking at stopwatch in the debugger, the only values that ever get updated are ElapsedTicks, mElapsed, mStartPerfCount. Everything else is always zero. Is this expected behavior? Do I need to call an additional method to have the stopwatch calculate the Elapsed struct? (Note: stopwatch.ElapsedMilliseconds is also zero)

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• Is there anything like Unity for simple things that don't require an interface?

  - by Dave

  Perhaps I'm misapplying Unity, but here goes. I have a couple of applications, both of which load the same plugin assemblies. All assemblies require a library, and I want them to be able to access this library via Unity. However, in order to use Unity, or any other IoC framework, I'd have to write an interface for this library. I will probably do this, but since an interface isn't really needed for anything other than to support Unity, I am afraid that this means that I am 1) missing the point, or 2) misapplying the framework. If I avoid something that offers me DI, then I'd have to make the library class a singleton, and then pass it to all of the plugin constructors, or via a public property, and I don't want to do this. That said, and without actually implementing anything with Unity yet, I'm not getting one other detail -- although Unity will let me request the library via Resolve<, my plugins will still need to have a reference to the Unity instance that is created in the main applications. So is this a case where your only option is to pass the Unity reference to all of the plugins, but then it's convenient from that point on, merely because you can use Unity to get at all of the other dependencies?

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• StrcutureMap Wiring - Sanity Check Please

  - by Steve Ward

  Hi - Im new to IOC and StructureMap and have an n-level application and am looking at how to setup the wirings (ForRequestedType ...) and just want to check with people with more experience that this is the best way of doing it! I dont want my UI application object to reference my persistence layer directly so am not able to wire everything up in this UI project. I now have it working by defining a Registry class in each project which wires up the types in the project as needed. The layer above registers its types and also calls the assembly below and looks for registries so that all types are registered throught the hierrachy. E.g. I have UI, Service, Domain, and Persistence libraries. In my service layer the registry looks like Scan(x => { x.Assembly("MyPersistenceProject"); x.LookForRegistries(); }); ForRequestedType<IService>().TheDefault.Is.OfConcreteType<MyService>(); Is this a recommended way of doing this in a setup such as this? Are there better ways and what are the advantages / disadvantages of these approaches in this case?

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• Constructor on type: "Namespace.type" not found.

  - by Nick

  Hello, I am using Castle.Windsor as an IOC. So I am trying to resolve a service type in the constructor of an HTTPHandler. I keep receiving this error, "Constructor on type: "Namespace.type" not found." My configuration has the following entries for service type: IDocumentDirectory <component id="restricted.content.directory" service="org.healthwise.foundations.services.content.IDocumentDirectory, org.healthwise.foundations.services" type="org.healthwise.foundations.services.content.RestrictedLocalizationDocumentDirectory, org.healthwise.foundations.services"> <parameters> <contentDirectory>${content.directory}</contentDirectory> <localizations> <array> <item>en-us</item> <item>es-us</item> </array> </localizations> </parameters> </component> <component id="content.directory" service="org.healthwise.foundations.services.content.IDocumentDirectory, org.healthwise.foundations.services" type="org.healthwise.foundations.services.web.client.WebServiceDocumentDirectory, org.healthwise.foundations.services.web.client"> <parameters> <webServiceURL>#{contentDirectoryWebsiteUrl}</webServiceURL> </parameters> </component> In my new handler the constructor looks like this: public HeartBeatHttpHandler(IDocumentDirectory contentDirectory) { _contentDirectory = contentDirectory; } I have never recieved this error using Castle.Windsor. Can someone explain? Thanks!

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• Resolve dependency with autofac based on constructor parameter attribute

  - by Andrew Davey

  I'm using AutoFac. I want to inject a different implementation of a dependency based on an attribute I apply to the constructor parameter. For example: class CustomerRepository { public CustomerRepository([CustomerDB] IObjectContainer db) { ... } } class FooRepository { public FooRepository([FooDB] IObjectContainer db) { ... } } builder.Register(c => /* return different instance based on attribute on the parameter */) .As<IObjectContainer>(); The attributes will be providing data, such as a connection string, which I can use to instance the correct object. How can I do this?

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• MEF Property Export with PartCreationPolicy

  - by Daniel Skinner

  When I try to do this: [Export(typeof(IMyService))] [PartCreationPolicy(CreationPolicy.Shared)] private MyService Service { get { var service = new MyService(); service.Configure(); return service; } } I get a compile error: Attribute 'PartCreationPolicy' is not valid on this declaration type. It is only valid on 'class' declarations. Is this a bug? I don't see why MEF would allow property exports but not allow one to specify the part lifetime. Using VS2010 RC.

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• Problem resolving a generic Repository with Entity Framework and Castle Windsor Container

  - by user368776

  Hi, im working in a generic repository implementarion with EF v4, the repository must be resolved by Windsor Container. First the interface public interface IRepository<T> { void Add(T entity); void Delete(T entity); T Find(int key) } Then a concrete class implements the interface public class Repository<T> : IRepository<T> where T: class { private IObjectSet<T> _objectSet; } So i need _objectSet to do stuff like this in the previous class public void Add(T entity) { _objectSet.AddObject(entity); } And now the problem, as you can see im using a EF interface like IObjectSet to do the work, but this type requires a constraint for the T generic type "where T: class". That constrait is causing an exception when Windsor tries to resolve its concrete type. Windsor configuration look like this. <castle> <components> <component id="LVRepository" service="Repository.Infraestructure.IRepository`1, Repository" type="Repository.Infraestructure.Repository`1, Repository" lifestyle="transient"> </component> </components> The container resolve code IRepository<Product> productsRep =_container.Resolve<IRepository<Product>>(); Now the exception im gettin System.ArgumentException: GenericArguments[0], 'T', on 'Repository.Infraestructure.Repository`1[T]' violates the constraint of type 'T'. ---> System.TypeLoadException: GenericArguments[0], 'T', on 'Repository.Infraestructure.Repository`1[T]' violates the constraint of type parameter 'T'. If i remove the constraint in the concrete class and the depedency on IObjectSet (if i dont do it get a compile error) everything works FINE, so i dont think is a container issue, but IObjectSet is a MUST in the implementation. Some help with this, please.

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• Ninject woes... 404 error problems

  - by jbarker7

  We are using the beloved Ninject+Ninject.Web.Mvc with MVC 2 and are running into some problems. Specifically dealing with 404 errors. We have a logging service that logs 500 errors and records them. Everything is chugging along just perfectly except for when we attempt to enter a non-existent controller. Instead of getting the desired 404 we end up with a 500 error: Cannot be null Parameter name: service [ArgumentNullException: Cannot be null Parameter name: service] Ninject.ResolutionExtensions.GetResolutionIterator(IResolutionRoot root, Type service, Func`2 constraint, IEnumerable`1 parameters, Boolean isOptional) +188 Ninject.ResolutionExtensions.TryGet(IResolutionRoot root, Type service, IParameter[] parameters) +15 Ninject.Web.Mvc.NinjectControllerFactory.GetControllerInstance(RequestContext requestContext, Type controllerType) +36 System.Web.Mvc.DefaultControllerFactory.CreateController(RequestContext requestContext, String controllerName) +68 System.Web.Mvc.MvcHandler.ProcessRequestInit(HttpContextBase httpContext, IController& controller, IControllerFactory& factory) +118 System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContextBase httpContext, AsyncCallback callback, Object state) +46 System.Web.Mvc.MvcHandler.BeginProcessRequest(HttpContext httpContext, AsyncCallback callback, Object state) +63 System.Web.Mvc.MvcHandler.System.Web.IHttpAsyncHandler.BeginProcessRequest(HttpContext context, AsyncCallback cb, Object extraData) +13 System.Web.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute() +8679426 System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously) +155 I did some searching and found some similar issues, but those 404 issues seem to be unrelated. Any help here would be great. Thanks! Josh

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• Unity: How to remove(unregister) registered instance from Unity mapping.

  - by bug0r

  Hello, I meet one problem that i can't solve now. I have the following: UnityHelper.DefaultContainer.RegisterInstance(typeof(IMyInterface), "test", instance); where UnityHelper.DefaultContainer is my helper for getting unity container with loaded configuration. here I registered instance as an instance of IMyInterface. So anywhere(some time after using) I want to remove this mapping. Remove it at all. How I can do it? I have tried UnityHelper.DefaultContainer.Teardown(instance) but is was unsuccessfull and the following code returns instance anyway. UnityHelper.DefaultContainer.ResolveAll() Any ideas? Thank you.

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• Castle Windsor using wrong component to satisfy a dependency

  - by Neil Barnwell

  I have the following component mapping in Windsor xml: <component id="dataSession.DbConnection" service="System.Data.IDbConnection, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" type="System.Data.SqlClient.SqlConnection, System.Data, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089" lifestyle="custom" customLifestyleType="MyCompany.Castle.PerOperationLifestyle.PerOperationLifestyleManager, MyCompany.Castle"> <parameters> <connectionString>server=(local);database=MyCompany;trusted_connection=true;application name=OperationScopeTest;</connectionString> </parameters> </component> <component id="dataSession.DataContext" service="System.Data.Linq.DataContext, System.Data.Linq, Version=3.5.0.0, Culture=neutral, PublicKeyToken=B77A5C561934E089" type="MyCompany.BusinessLogic.MyCompanyDataContext, MyCompany.BusinessLogic" lifestyle="custom" customLifestyleType="MyCompany.Castle.PerOperationLifestyle.PerOperationLifestyleManager, MyCompany.Castle"> <parameters> <connection>${dataSession.DbConnection}</connection> </parameters> </component> However, when I ask the container for a DataContext, it actually uses the constructor requiring a connection string, despite the ${dataSession.DbConnection} being an IDbConnection. Why is this, and how to I make Windsor use the correct constructor?

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• Issue with Autofac 2 and MVC2 using HttpRequestScoped

  - by Page Brooks

  I'm running into an issue with Autofac2 and MVC2. The problem is that I am trying to resolve a series of dependencies where the root dependency is HttpRequestScoped. When I try to resolve my UnitOfWork (which is Disposable), Autofac fails because the internal disposer is trying to add the UnitOfWork object to an internal disposal list which is null. Maybe I'm registering my dependencies with the wrong lifetimes, but I've tried many different combinations with no luck. The only requirement I have is that MyDataContext lasts for the entire HttpRequest. I've posted a demo version of the code for download here. Autofac modules are set up in web.config Global.asax.cs protected void Application_Start() { string connectionString = "something"; var builder = new ContainerBuilder(); builder.Register(c => new MyDataContext(connectionString)).As<IDatabase>().HttpRequestScoped(); builder.RegisterType<UnitOfWork>().As<IUnitOfWork>().InstancePerDependency(); builder.RegisterType<MyService>().As<IMyService>().InstancePerDependency(); builder.RegisterControllers(Assembly.GetExecutingAssembly()); _containerProvider = new ContainerProvider(builder.Build()); IoCHelper.InitializeWith(new AutofacDependencyResolver(_containerProvider.RequestLifetime)); ControllerBuilder.Current.SetControllerFactory(new AutofacControllerFactory(ContainerProvider)); AreaRegistration.RegisterAllAreas(); RegisterRoutes(RouteTable.Routes); } AutofacDependencyResolver.cs public class AutofacDependencyResolver { private readonly ILifetimeScope _scope; public AutofacDependencyResolver(ILifetimeScope scope) { _scope = scope; } public T Resolve<T>() { return _scope.Resolve<T>(); } } IoCHelper.cs public static class IoCHelper { private static AutofacDependencyResolver _resolver; public static void InitializeWith(AutofacDependencyResolver resolver) { _resolver = resolver; } public static T Resolve<T>() { return _resolver.Resolve<T>(); } } UnitOfWork.cs public interface IUnitOfWork : IDisposable { void Commit(); } public class UnitOfWork : IUnitOfWork { private readonly IDatabase _database; public UnitOfWork(IDatabase database) { _database = database; } public static IUnitOfWork Begin() { return IoCHelper.Resolve<IUnitOfWork>(); } public void Commit() { System.Diagnostics.Debug.WriteLine("Commiting"); _database.SubmitChanges(); } public void Dispose() { System.Diagnostics.Debug.WriteLine("Disposing"); } } MyDataContext.cs public interface IDatabase { void SubmitChanges(); } public class MyDataContext : IDatabase { private readonly string _connectionString; public MyDataContext(string connectionString) { _connectionString = connectionString; } public void SubmitChanges() { System.Diagnostics.Debug.WriteLine("Submiting Changes"); } } MyService.cs public interface IMyService { void Add(); } public class MyService : IMyService { private readonly IDatabase _database; public MyService(IDatabase database) { _database = database; } public void Add() { // Use _database. } } HomeController.cs public class HomeController : Controller { private readonly IMyService _myService; public HomeController(IMyService myService) { _myService = myService; } public ActionResult Index() { // NullReferenceException is thrown when trying to // resolve UnitOfWork here. // Doesn't always happen on the first attempt. using(var unitOfWork = UnitOfWork.Begin()) { _myService.Add(); unitOfWork.Commit(); } return View(); } public ActionResult About() { return View(); } }

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• Get Instance from StructureMap by Type Name

  - by JC Grubbs

  Is there any way to request an instance from the StructureMap ObjectFactory by the string name of the type? For example, it would be nice to do something like this: var thing = ObjectFactory.GetInstance("Thing"); The use case here is a messaging scenario in which the message is very generic and contains only the name of a task. The handler receives the message, gets the task name from the message and retrieves the Type of task runner from a configuration database. StructureMap scans all the assemblies in a directory and one of them will contain the Type returned from the config database which then needs to be instantiated. The other possibility is to grab a Type instance by doing the following: var type = Type.GetType("Thing"); But the problem there is the assembly may or may/not be loaded in the AppDomain so that reflection call isn't always possible.

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• Can Castle Windsor resolve public setter proporities

  - by Khalil Dahab

  I've read here that Castle Windsor can resolve public writable properties for optional dependencies, however I couldn't make it work for me. Do I have to enable this manually when I create a WindsorContainer?

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• How to approach ninject container/kernel in inheritance situation

  - by Bas

  I have the following situation: class RuleEngine {} abstract class RuleImplementation {} class RootRule : RuleImplementation {} class Rule1 : RuleImplementation {} class Rule2 : RuleImplementation {} The RuleEngine is injected by Ninject and has a kernel at it's disposal, the role of the RuleEngine is to fire off the root rule, which on it's turn will load all the other rules also using Ninject, but using a different Module and creating a new Kernel. Now my question is, some of the rules require some dependencies which I want to inject using Ninject. What would be the best way to create the kernel for these rules and also still do proper unit testing with it? (the kernel shouldn't become a real pain in my tests) I've been thinking of the following possibilitys: The kernel that I use in the RuleEngine class could be tossed around to RuleImplementation and thus be available for every rule. But tossing around Kernels isn't really something I wish to do. When creating the rules, I could give the kernel (which creates the rules) as a constructor argument for each rule. I could create a method inside the RuleImplementation which creates a kernel and makes it possible for the rules to retrieve the kernel using a get() in the abstract class Whats the convention of passing around/creating kernels? Just create new kernels, or reuse them?

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• Cannot resolve Dictionary in Unity container

  - by IanR

  Hi, I've just stumbled upon this: within a Unity container, I want to register IDictionary<TK, TV>; assume that it's IDictionary<string, int> _unityContainer = new UnityContainer() .RegisterType<IDictionary<string, int>, Dictionary<string, int>>(); but if I try var d = _unityContainer.Resolve<IDictionary<string, int>>(); it fails to resolve... I get... Microsoft.Practices.Unity.ResolutionFailedException: Microsoft.Practices.Unity.ResolutionFailedException: Resolution of the dependency failed, type = "System.Collections.Generic.IDictionary`2[System.String,System.Int32]", name = "(none)". Exception occurred while: while resolving. Exception is: InvalidOperationException - The type Dictionary`2 has multiple constructors of length 2. Unable to disambiguate. At the time of the exception, the container was: Resolving System.Collections.Generic.Dictionary2[System.String,System.Int32],(none) (mapped from System.Collections.Generic.IDictionary2[System.String,System.Int32], (none)) --- System.InvalidOperationException: The type Dictionary`2 has multiple constructors of length 2. Unable to disambiguate.. So it looks like it has found the Type to resolve (being Dictionary<string, int>) but failed to new it up... How come unity can't resolve this type? If I type IDictionary<string, int> d = new Dictionary<string, int>() that works... any ideas? thanks!

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• Configuring Unity with a closed generic constructor parmater

  - by fearofawhackplanet

  I've been trying to read the article here but I still can't understand it. I have a constructor resembling the following: IOrderStore orders = new OrderStore(new Repository<Order>(new OrdersDataContext())); The constructor for OrderStore: public OrderStore(IRepository<Order> orderRepository) Constructor for Repository<T>: public Repository(DataContext dataContext) How do I set this up in the Unity config file? UPDATE: I've spent the last few hours banging my head against this, and although I'm not really any closer to getting it right I think at least I can be a little more specific about the problem. I've got my IRespository<T> working ok: <typeAlias alias="IRepository" type="MyAssembly.IRepository`1, MyAssembly" /> <typeAlias alias="Repository" type="MyAssembly.Repository`1, MyAssembly" /> <typeAlias alias="OrdersDataContext" type="MyAssembly.OrdersDataContext, MyAssembly" /> <types> <type type="OrdersDataContext"> <typeConfig> <constructor /> <!-- ensures paramaterless constructor used --> </typeConfig> </type> <type type="IRepository" mapTo="Repository"> <typeConfig> <constructor> <param name="dataContext" parameterType="OrdersDataContext"> <dependency /> </param> </constructor> </typeConfig> </type> </types> So now I can get an IRepository like so: IRepository rep = _container.Resolve(); and that all works fine. The problem now is when trying to add the configuration for IOrderStore <type type="IOrderStore" mapTo="OrderStore"> <typeConfig> <constructor> <param name="ordersRepository" parameterType="IRepository"> <dependency /> </param> </constructor> </typeConfig> </type> When I add this, Unity blows up when trying to load the config file. The error message is OrderStore does not have a constructor that takes the parameters (IRepository`1). What I think this is complaining about is because the OrderStore constructor takes a closed IRepository generic type, ie OrderStore(IRepository<Order>) and not OrderStore(IRepository<T>) I don't have any idea how to resolve this.

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• Is MEF an all-or-nothing affair?

  - by Dave

  I've had a few questions about MEF recently, but here's the big one -- is it really all-or-nothing, as it appears to be? My basic application structure is simply an app, several shared libraries that are intended to be singletons, and several different plugins (which may implement different interfaces). The app loads the plugins, and both the app and all plugins need to access the shared libraries. My first go at MEF was fairly successful, although I made some stupid mistakes along the way because I was trying so many different things, I just got confused at times. But in the end, last night I got my smallish test app running with MEF, some shared libraries, and one plugin. Now I'm moving onto the target app, which I already described. And it's the multiple plugins part that has be a bit worried. My existing application already supports multiple plugins with different interfaces by using Reflection. I need to be able to uniquely identify each plugin so that the user can select one and get the expected behavior exposed by that plugin. The problem is that I don't know how to do this yet... but that's the topic of a different question. Ideally, I'd be able to take my existing plugin loader and use it as-is, while relying on MEF to do the shared library resolution. The problem is, I can't seem to get MEF to load them (i.e. I get a CompositionException when calling ComposeParts()) unless I also use MEF to load the plugin. And if I do this, well... then I need to know how to keep track of them as they get loaded so the user can select one from a list of plugins. What have your experiences been with trying to mix and match these approaches?

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• Contructor parameters for dependent classes with Unity Framework

  - by Onisemus

  I just started using the Unity Application Block to try to decouple my classes and make it easier for unit testing. I ran into a problem though that I'm not sure how to get around. Looked through the documentation and did some Googling but I'm coming up dry. Here's the situation: I have a facade-type class which is a chat bot. It is a singleton class which handles all sort of secondary classes and provides a central place to launch and configure the bot. I also have a class called AccessManager which, well, manages access to bot commands and resources. Boiled down to the essence, I have the classes set up like so. public class Bot { public string Owner { get; private set; } public string WorkingDirectory { get; private set; } private IAccessManager AccessManager; private Bot() { // do some setup // LoadConfig sets the Owner & WorkingDirectory variables LoadConfig(); // init the access mmanager AccessManager = new MyAccessManager(this); } public static Bot Instance() { // singleton code } ... } And the AccessManager class: public class MyAccessManager : IAccessManager { private Bot botReference; public MyAccesManager(Bot botReference) { this.botReference = botReference; SetOwnerAccess(botReference.Owner); } private void LoadConfig() { string configPath = Path.Combine( botReference.WorkingDirectory, "access.config"); // do stuff to read from config file } ... } I would like to change this design to use the Unity Application Block. I'd like to use Unity to generate the Bot singleton and to load the AccessManager interface in some sort of bootstrapping method that runs before anything else does. public static void BootStrapSystem() { IUnityContainer container = new UnityContainer(); // create new bot instance Bot newBot = Bot.Instance(); // register bot instance container.RegisterInstance<Bot>(newBot); // register access manager container.RegisterType<IAccessManager,MyAccessManager>(newBot); } And when I want to get a reference to the Access Manager inside the Bot constructor I can just do: IAcessManager accessManager = container.Resolve<IAccessManager>(); And elsewhere in the system to get a reference to the Bot singleton: // do this Bot botInstance = container.Resolve<Bot>(); // instead of this Bot botInstance = Bot.Instance(); The problem is the method BootStrapSystem() is going to blow up. When I create a bot instance it's going to try to resolve IAccessManager but won't be able to because I haven't registered the types yet (that's the next line). But I can't move the registration in front of the Bot creation because as part of the registration I need to pass the Bot as a parameter! Circular dependencies!! Gah!!! This indicates to me I have a flaw in the way I have this structured. But how do I fix it? Help!!

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• Multi tenancy with Unity

  - by Savvas Sopiadis

  Hi everybody! I'm trying to implement this scenario using Unity and i can't figure out how this could be done: the same web application (ASP.NET MVC) should be made accessible to more than one client (multi-tenant). The URL of the web site will differentiate the client (this i know how to get). So getting the URL one could set the (let's call it) IConnectionStringProvider parameter (which will be afterward injected into IRepository and so on). Through which mechanism (using Unity) do i set the IConnectionStringProvider parameter at run time? I have done this in the past using Windsor & IHandlerSelector (see this) but it's my first attempt using Unity. Any help is deeply appreciated! Thanks in advance

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