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    <p>The way I am currently using Ninject (v3) with my WCF is based on the Ninject WCF extension and <a href="http://pieterderycke.wordpress.com/2011/05/09/using-an-ioc-container-to-create-wcf-service-instances/" rel="nofollow">Pieter De Rycke's great blog post</a>.</p> <p>In a nutshell, here's what I'm doing:</p> <p>1) Via NuGet, I've added a reference to Ninject.Extensions.Wcf into my WCF project. This creates the App_Start folder with NinjectWebCommon.cs, which takes care of initializing Ninject.</p> <p>2) Typically, you'd set up your Ninject mappings in the CreateKernel method in NinjectWebCommon.cs. However, since I have a MVC3 site in the same solution and want the same Ninject mappings for that site, my CreateKernel looks like this:</p> <pre><code> private static IKernel CreateKernel() { var kernel = new StandardKernel(); kernel.Bind&lt;Func&lt;IKernel&gt;&gt;().ToMethod(ctx =&gt; () =&gt; new Bootstrapper().Kernel); kernel.Bind&lt;IHttpModule&gt;().To&lt;HttpApplicationInitializationHttpModule&gt;(); InfrastructureSetup.RegisterServices(kernel); return kernel; } </code></pre> <p>3) In InfrastructureSetup.RegisterServices, I have my Ninject mappings:</p> <pre><code>public static class InfrastructureSetup { public static void RegisterServices(IKernel kernel) { kernel.Bind&lt;IRepositoryContext&gt;().To&lt;MyEntityFrameworkContext&gt;().InRequestScope(); kernel.Bind&lt;IFooRepository&gt;().To&lt;FooRepository&gt;().InRequestScope(); kernel.Bind&lt;IBarRepository&gt;().To&lt;BarRepository&gt;().InRequestScope(); // ... and so on. I want InRequestScope() for the EF context, since // otherwise my repositories (which take IRepositoryContext in their // constructors) end up getting different EF contexts, messing things up } } </code></pre> <p>4) I want to also inject stuff (IFooService etc.) to my WCF constructors, so I've edited the Web.config for the WCF project with the advice from Pieter De Rycke:</p> <pre><code> &lt;behaviors&gt; &lt;serviceBehaviors&gt; &lt;behavior name=""&gt; &lt;serviceMetadata httpGetEnabled="true" /&gt; &lt;serviceDebug includeExceptionDetailInFaults="false" /&gt; &lt;!-- Add the Ninject behavior to the WCF service. This is needed to support dependency injection to the WCF constructors --&gt; &lt;ninject /&gt; &lt;/behavior&gt; &lt;/serviceBehaviors&gt; &lt;/behaviors&gt; &lt;extensions&gt; &lt;behaviorExtensions&gt; &lt;!-- Add the Ninject behavior extension --&gt; &lt;add name="ninject" type="MyWCFProject.Infrastructure.NinjectBehaviorExtensionElement, MyWCFProject, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null" /&gt; &lt;/behaviorExtensions&gt; &lt;/extensions&gt; </code></pre> <p>5) In the MyWCFProject.Infrastructure namespace, I have three files which are basically copy-paste from Pieter:</p> <p>NinjectBehaviorAttribute.cs:</p> <pre><code>using System; using System.Collections.ObjectModel; using System.ServiceModel; using System.ServiceModel.Channels; using System.ServiceModel.Description; using System.ServiceModel.Dispatcher; using Ninject.Web.Common; namespace MyWCFProject.Infrastructure { public class NinjectBehaviorAttribute : Attribute, IServiceBehavior { public void AddBindingParameters(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase, Collection&lt;ServiceEndpoint&gt; endpoints, BindingParameterCollection bindingParameters) { } public void ApplyDispatchBehavior(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { Type serviceType = serviceDescription.ServiceType; // Set up Ninject to support injecting to WCF constructors var kernel = new Bootstrapper().Kernel; IInstanceProvider instanceProvider = new NinjectInstanceProvider(kernel, serviceType); foreach (ChannelDispatcher dispatcher in serviceHostBase.ChannelDispatchers) { foreach (EndpointDispatcher endpointDispatcher in dispatcher.Endpoints) { DispatchRuntime dispatchRuntime = endpointDispatcher.DispatchRuntime; dispatchRuntime.InstanceProvider = instanceProvider; } } } public void Validate(ServiceDescription serviceDescription, ServiceHostBase serviceHostBase) { } } } </code></pre> <p>NinjectBehaviorExtensionElement.cs:</p> <pre><code>using System; using System.ServiceModel.Configuration; namespace MyWCFProject.Infrastructure { public class NinjectBehaviorExtensionElement : BehaviorExtensionElement { public override Type BehaviorType { get { return typeof(NinjectBehaviorAttribute); } } protected override object CreateBehavior() { return new NinjectBehaviorAttribute(); } } } </code></pre> <p>NinjectInstanceProvider.cs:</p> <pre><code>using System; using System.ServiceModel; using System.ServiceModel.Channels; using System.ServiceModel.Dispatcher; using Ninject; namespace MyWCFProject.Infrastructure { public class NinjectInstanceProvider : IInstanceProvider { private Type serviceType; private IKernel kernel; public NinjectInstanceProvider(IKernel kernel, Type serviceType) { this.kernel = kernel; this.serviceType = serviceType; } public object GetInstance(InstanceContext instanceContext) { return this.GetInstance(instanceContext, null); } public object GetInstance(InstanceContext instanceContext, Message message) { return kernel.Get(this.serviceType); } public void ReleaseInstance(InstanceContext instanceContext, object instance) { } } } </code></pre> <p>At the moment, this solution seems to be working well; dependency injection is working for both the WCF and the MVC3 site, I can request dependencies to be injected to the WCF constructors and the EF context stays around for the duration of the request. </p>
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    1. POUsing Ninject WCF Extension with WCF Web Service
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    1. USLauri Harpf
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