托管在IIS上一个WCF Web服务时显式调用服务的构造 [英] Explicitly calling a service constructor when hosting a WCF web service on IIS

问题描述

我想举办我的微软IIS（IIS托管）。

I want to host a WCF service of mine on Microsoft IIS (IIS hosting).

要做到这一点，我创建了我的服务：

To do this, I created my service:

// The service
public class MyService : IMyService {
    // Ctors
    public MyService() {
        // Def ctor: I don't want to call it
    }
    public MyService(...) : this() {
        // Parametric ctor, I want to call it!
    }
   ...
}

// The contract
[ServiceContract]
public interface IMyService {
    ...
}

我创建了一个SVC文件（一个好方法，给基地址到我的服务）：

I created a svc file (a good approach to give a base address to my service):

<@ServiceHost Service="MyService" @>

但这样做，我的托管服务时（只是建立在IIS指向在我的应用程序所在的文件夹中的虚拟目录，通常是项目目录），IIS将调用默认的构造函数。

But doing so, when hosting my service (simply creating a virtual directory in IIS pointing to the folder where my application resides, the project directory usually), IIS will call the default constructor.

如何使IIS调用不同的构造函数？

How do I make IIS call a different constructor?

PS：我知道这是可以指定一个 HostServiceFactory 。有什么事情我应该在这里使用？这使我回厂的主机。对于主机，我不能作用于主机传递的参数。但是，我该如何解决这个问题？

PS: I know that it is possible to specify a HostServiceFactory. Is it something I should use here? It gives me back the factory and a host. For the host, I cannot act on the host passed parameters. However, how do I solve this problem?

注：我了解，很多解决方案都基于控制 反转（IoC）和几个如团结，的城堡项目和 Spring.NET 。不过，我不会真的使用它们。可以 WCF 自己做呢？我无法接受的是WCF不能让一个程序员主机服务，通过构建它以适当的方式......

NOTE: I understood that many solutions are based on Inversion of control (IoC) and several IoC frameworks like Unity, Castle Project and Spring.NET. However I would not really use them at all. Can WCF make this on its own? I cannot accept that WCF cannot let a programmer host a service by constructing it in the appropriate manner...

推荐答案

您必须编写一些自定义的类来支持与参数创建服务：

You must write several custom classes to support creating service with parameters:

• 在自定义类实现 IInstanceProvider 。这个类将负责与您的非默认构造函数创建服务实例。
• 在自定义类实现 IServiceBehavior接口。这个类将负责添加自定义实例提供到终点调度。
• 在自定义的ServiceHost 将适用你的行为。
• 在自定义 ServiceHostFactory 将实例化您的自定义服务主机。你会从.svc文件中引用这个工厂。

• Custom class implementing IInstanceProvider. This class will be responsible for creating your service instance with your non default constructor.
• Custom class implementing IServiceBehavior. This class will be responsible for adding custom instance provider into endpoint dispatcher.
• Custom ServiceHost which will apply your behavior.
• Custom ServiceHostFactory which will instantiate your custom service host. You will reference this factory from .svc file.

这是大致相同，构建依赖注入的支持。您可以检查，例如<一个href="http://weblogs.asp.net/fabio/archive/2009/03/24/inversion-of-control-with-wcf-and-unity.aspx">this文章。

This is generally the same as building support for dependency injection. You can check for example this article.

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