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

问题描述

MyServiceHost

$ b $ public class MyServiceHost：ServiceHost
{
public MyServiceHost（IUnityContainer container，Type serviceType，params Uri [] baseAddresses）
：base（serviceType ，baseAddresses）
{
if（container == null）
{
throw new ArgumentNullException（container）;
}
foreach（在此.ImplementedContracts.Values中的var cd）
{
cd.Behaviors.Add（new DependencyInjectionInstanceProvider（container））;
}
}
}

DependencyInjectionInstanceProvider： / strong>

  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成员
 
公共对象GetInstance（InstanceContext instanceContext，消息消息）
 {
返回此.GetInstance（的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会员
 
 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验证（ContractDescription contractDescription，ServiceEndpoint endpoint）
 {
} 
 #endregion 
 
} 
  

MyServiceHostFactory：

  public class MyServiceHostFactory：ServiceHostFactory 
 {
 private readonly IUnityContainer container; 
 protected override ServiceHost CreateServiceHost（type serviceType，Uri [] baseAddresses）
 {
返回新的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]）* @（（[ 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）
 {
键入serviceType = typeof （为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。由于第一个参数期望构造器字符串而不是类型，因此CreateServiceHost调用具有语法错误。我不明白，因为它接受一个Type参数。除此之外，我不明白我应该将IFakeDAL映射到一个具体的类。我可以在app.config文件中执行，还是应该在其他地方注册？

解决方案

ServiceHostFactory 用于在IIS中托管。在自我托管中，您应直接使用您的派生的 ServiceHost 。 这里你有整个例子，包括Unity配置。

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); 
    }
}

Email Service with an attempted Constructor Injection:

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);
    }
}

My Console Host to start the Service:

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();

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?

解决方案

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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