将 Unity 依赖注入与 WCF 服务结合使用 [英] Using Unity Dependency Injection with WCF services

问题描述

在对其他问题进行了一些研究后，我有以下几点:

I have the following after doing some research on other questions:

MyServiceHost:

public class MyServiceHost : ServiceHost
{
    public MyServiceHost(IUnityContainer 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 DependencyInjectionInstanceProvider(container));
        }
    }
}

DependencyInjectionInstanceProvider:

public class DependencyInjectionInstanceProvider : IInstanceProvider, IContractBehavior 
{     
    private readonly IUnityContainer container;      
    public DependencyInjectionInstanceProvider(IUnityContainer 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.Teardown(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 

} 

MyServiceHostFactory:

    public class MyServiceHostFactory : ServiceHostFactory
{
    private readonly IUnityContainer container;     
    protected override ServiceHost CreateServiceHost(Type serviceType, Uri[] baseAddresses) 
    { 
        return new MyServiceHost(this.container, serviceType, baseAddresses); 
    }
}

尝试构造函数注入的电子邮件服务:

public class EmailValidator : IEmailValidator
{
    private IFakeDAL fakeDAL;

    public EmailValidator(IFakeDAL fakeDAL)
    {
        this.fakeDAL = fakeDAL;
    }

    public bool ValidateAddress(string emailAddress)
    {
        Console.WriteLine("Validating: {0}", emailAddress);

        string pattern = @"^([0-9a-zA-Z]([-.w]*[0-9a-zA-Z])*@(([0-9a-zA-Z])+([-w]*[0-9a-zA-Z])*.)+[a-zA-Z]{2,9})$";
        return Regex.IsMatch(emailAddress, pattern);
    }
}

我的控制台主机启动服务:

static void Main(string[] args)
    {
        Type serviceType = typeof(EmailValidator);
        Uri serviceUri = new Uri("http://localhost:8080/");

        MyServiceHostFactory shf = new MyServiceHostFactory();
        ServiceHost host = shf.CreateServiceHost(serviceType, serviceUri);
        //ServiceHost host = new ServiceHost(serviceType, serviceUri);
        host.Open();

我的问题在于控制台主机逻辑.由于第一个参数需要构造函数字符串而不是类型，因此 CreateServiceHost 调用存在语法错误.我不明白，因为它确实接受 Type 参数.除此之外，我不明白应该在哪里将 IFakeDAL 映射到具体类.我可以在 app.config 文件中这样做还是应该在其他地方注册?

My problem resides in the console host logic. The CreateServiceHost call has a syntax error due to the first argument expecting a Constructor string and not a Type. Which I don't understand since it does accept a Type parameter. In addition to that I don't understand where I should be mapping IFakeDAL to a concrete class. Can I do that in an app.config file or should I register that somewhere else?

推荐答案

ServiceHostFactory 用于在 IIS 中托管.在自托管中，您应该直接使用派生的 ServiceHost.这里 你有完整的例子，包括 Unity 配置.

ServiceHostFactory is for hosting in IIS. In self hosting you should use your derived ServiceHost directly. Here you have whole example including Unity configuration.

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