inversion-of-control - w3toppers.com

How to use Property Injection with AutoFac?

In my opinion the solution Ninject created is much nicer than the propertyinjection in Autofac. Therefore I created a a custom attribute which is a postsharp aspect which automatically injects my classes: [AutofacResolve] public IStorageManager StorageManager { get; set; } My aspect: [Serializable] [AttributeUsage(AttributeTargets.Property, AllowMultiple = false)] public class AutofacResolveAttribute : LocationInterceptionAspect { public override … Read more

Asp.Net MVC3: Set custom IServiceProvider in ValidationContext so validators can resolve services

On MVC 5.2, you can leveragesteal @Andras’s answer and the MVC source and: 1. Derive a DataAnnotationsModelValidatorEx from DataAnnotationsModelValidator namespace System.Web.Mvc { // From https://aspnetwebstack.codeplex.com/SourceControl/latest#src/System.Web.Mvc/DataAnnotationsModelValidator.cs // commit 5fa60ca38b58, Apr 02, 2015 // Only diff is adding of secton guarded by THERE_IS_A_BETTER_EXTENSION_POINT public class DataAnnotationsModelValidatorEx : DataAnnotationsModelValidator { readonly bool _shouldHotwireValidationContextServiceProviderToDependencyResolver; public DataAnnotationsModelValidatorEx( ModelMetadata metadata, ControllerContext … Read more

Why is IoC / DI not common in Python?

I don’t actually think that DI/IoC are that uncommon in Python. What is uncommon, however, are DI/IoC frameworks/containers. Think about it: what does a DI container do? It allows you to wire together independent components into a complete application … … at runtime. We have names for “wiring together” and “at runtime”: scripting dynamic So, … Read more

MEF vs. any IoC

When boiled down, the main difference is that IoC containers are generally most useful with static dependencies (known at compile-time), and MEF is generally most useful with dynamic dependencies (known only at run-time). As such, they are both composition engines, but the emphasis is very different for each pattern. Design decisions thus vary wildly, as … Read more

How to register Windows Forms with Simple Injector

Ideally, you would want to register your forms as Singleton. In my experience, however, this will result in hard to debug errors, especially when you use a BindingSource for binding your data to whatever. A second problem with using Singleton as the lifestyle is that if your application uses modeless windows, this windows will throw … Read more

IoC / Dependency Injection – please explain code versus XML

Hot-swapping dependencies is not the only goal of using a DI Container. Dependency Injection (DI) is a principle that helps us develop loosely coupled code. Loose coupling only means that we can vary consumer and service independently of each other. How we achieve this is not addressed at this level. DI Containers are frameworks that … Read more

DAL -> BLL

Split up the ASP.NET MVC application in two: One part is your original ASP.NET MVC application, but without any logic whatsover. Just keep the Composition Root and your Views (.aspx, etc.) in this project. Since this is the Composition Root, you can have references to all your other projects. However, since all logic would have … Read more

Using Simple Injector with Unit Of Work & Repository Pattern in Windows Form

The problem you have is the difference in lifestyles between your service, repository, unitofwork and dbcontext. Because the MemberRepository has a Singleton lifestyle, Simple Injector will create one instance which will be reused for the duration of the application, which could be days, even weeks or months with a WinForms application. The direct consequence from … Read more

Which Dependency Injection Tool Should I Use? [closed]

Having recently spiked the use of 6 of these (Windsor, Unity, Spring.Net, Autofac, Ninject, StructureMap) I can offer a quick summary of each, our selection criteria and our final choice. Note: we did not look at PicoContainer.Net as one of our team considered the .Net port to be quite poor from the Java version. We … Read more

Usage of IoC Containers; specifically Windsor

99% of the cases it’s one container instance per app. Normally you initialize it in Application_Start (for a web app), like this. After that, it’s really up to the consumer of the container. For example, some frameworks, like Monorail and ASP.NET MVC allow you to intercept the creation of the instances (the controllers in this … Read more