构造函数注入问题

Question

创建 MainClass 时，将调用 public MyWindsorClass(IMyInterface obj) {} ；创建 MainClass2 时，当我期望调用 public MyWindsorClass() {} 时，也会调用 public MyWindsorClass(IMyInterface obj) {} 。我究竟做错了什么？我在构造函数注入方面遇到问题。这是一个示例：

class Program
{
    static void Main(string[] args)
    {
        var container = new WindsorContainer(new XmlInterpreter());
        var objs = container.ResolveAll<IMyWindsorInterface>();
    }
}

public interface IMyWindsorInterface { }

public class MyWindsorClass : IMyWindsorInterface
{
    public MyWindsorClass() {}
    public MyWindsorClass(IMyInterface obj) {}
}

public interface IMyInterface { }
public class MyInjectedClass : IMyInterface{ }

<castle>
     <components>
        <component id="MainClass"
             service="CastleTest.IMyWindsorInterface, CastleTest"
             type="CastleTest.MyWindsorClass, CastleTest"
             inspectionBehavior="None"
             lifestyle="Transient">
       <parameters>
          <obj>${blah}</obj>
       </parameters>
        </component>
    <component id="MainClass2"
               service="CastleTest.IMyWindsorInterface, CastleTest"
               type="CastleTest.MyWindsorClass, CastleTest"
               inspectionBehavior="None"
               lifestyle="Transient" />
         <component id="blah" 
             service="CastleTest.IMyInterface, CastleTest" 
             type="CastleTest.MyInjectedClass, CastleTest" 
             inspectionBehavior="None"/>
     </components>
</castle>

创建 MainClass 时，将调用 public MyWindsorClass(IMyInterface obj) {} ；创建 MainClass2 时，当我期望调用 public MyWindsorClass() {} 时，也会调用 public MyWindsorClass(IMyInterface obj) {} 。我到底做错了什么？感谢任何可以提供帮助的人！

Answer 1

默认情况下，Windsor 将自动装配所有可用的依赖项。在您的情况下，IMyInterface 可作为组件使用，因此 Windsor 将选择可以满足最多依赖项的构造函数。

您可以通过从组件模型中删除构造函数来临时更改此行为，以便 Windsor 不再“看到”它：

var container = new WindsorContainer();
container.Kernel.ComponentModelCreated += model => {
    if (model.Name == "MainClass2")
        model.Constructors.Remove(model.Constructors.First(c => c.Dependencies.Any(m => m.TargetType == typeof(IMyInterface))));
};
container.Install(Configuration.FromAppConfig());