临摹微笑
WCF支持构造函数注入，但是您必须跳过几个步骤才能到达那里。关键在于编写自定义ServiceHostFactory。尽管它也必须具有默认构造函数，但是您可以使用它构造所有正确的行为。作为示例，我最近写了一篇使用Castle Windsor来为服务实现连接依赖关系的示例。CreateServiceHost的实现只是这样做：return new WindsorServiceHost(this.container, serviceType, baseAddresses);this.container配置的IWindsorContainer 在哪里。WindsorServiceHost看起来像这样：public class WindsorServiceHost : ServiceHost{ public WindsorServiceHost(IWindsorContainer container, Type serviceType, params Uri[] baseAddresses) : base(serviceType, baseAddresses) { if (container == null) { throw new ArgumentNullException("container"); } foreach (var cd in this.ImplementedContracts.Values) { cd.Behaviors.Add(new WindsorInstanceProvider(container)); } }}和WindsorInstanceProvider看起来像这样：public class WindsorInstanceProvider : IInstanceProvider, IContractBehavior{ private readonly IWindsorContainer container; public WindsorInstanceProvider(IWindsorContainer container) { if (container == null) { throw new ArgumentNullException("container"); } this.container = container; } #region IInstanceProvider Members public object GetInstance(InstanceContext instanceContext, Message message) { return this.GetInstance(instanceContext); } public object GetInstance(InstanceContext instanceContext) { var serviceType = instanceContext.Host.Description.ServiceType; return this.container.Resolve(serviceType); } public void ReleaseInstance(InstanceContext instanceContext, object instance) { this.container.Release(instance); } #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}这看起来可能很多，但是请注意，它是可重用的通用代码，其循环复杂度较低。您可以遵循相同的编码习惯，使用另一个DI容器或使用穷人的DI来实现依赖注入。