WCF service dependency injection
// You'll need to implement a combination of custom ServiceHostFactory, ServiceHost and IInstanceProvider. // Given a service with this constructor signature: //public MyService(IDependency dep) // Register MyServiceHostFactory in your MyService.svc file, or use MyServiceHost directly in code for self-hosting scenarios. public class MyServiceHostFactory : ServiceHostFactory { private readonly IDependency dep; public MyServiceHostFactory() { this.dep = new MyClass(); } protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses) { return new MyServiceHost(this.dep, serviceType, baseAddresses); } } public class MyServiceHost : ServiceHost { public MyServiceHost(IDependency dep, Type serviceType, params Uri[] baseAddresses) : base(serviceType, baseAddresses) { if (dep == null) { throw new ArgumentNullException("dep"); } foreach (var cd in this.ImplementedContracts.Values) { cd.Behaviors.Add(new MyInstanceProvider(dep)); } } } public class MyInstanceProvider : IInstanceProvider, IContractBehavior { private readonly IDependency dep; public MyInstanceProvider(IDependency dep) { if (dep == null) { throw new ArgumentNullException("dep"); } this.dep = dep; } #region IInstanceProvider Members public object GetInstance(InstanceContext instanceContext, Message message) { return this.GetInstance(instanceContext); } public object GetInstance(InstanceContext instanceContext) { return new MyService(this.dep); } public void ReleaseInstance(InstanceContext instanceContext, object instance) { var disposable = instance as IDisposable; if (disposable != null) { disposable.Dispose(); } } #endregion #region IContractBehavior Members public void AddBindingParameters(ContractDescription contractDescription, ServiceEndpoint endpoint, BindingParameterCollection bindingParameters) { } public void ApplyClientBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, ClientRuntime clientRuntime) { } public void ApplyDispatchBehavior(ContractDescription contractDescription, ServiceEndpoint endpoint, DispatchRuntime dispatchRuntime) { dispatchRuntime.InstanceProvider = this; } public void Validate(ContractDescription contractDescription, ServiceEndpoint endpoint) { } #endregion }
