c# - 可能的 GetObjectsOfType 替换

Question

我有这么一小段代码

var idObjects = Spring.Context.Support.ContextRegistry.GetContext()
                      .GetObjectsOfType(typeof (ICustomInterfaceThatDoesSomething));
foreach (ICustomInterfaceThatDoesSomething icitds in idObjects.Values)
      icitds.DoSomething();

有没有办法让 spring.net 自动将单例注入(inject)我声明的属性，比如 ICustomInterfaceThatDoesSomething 数组？

我想要这样的东西的唯一原因是因为我想取消对项目的 .dll 依赖，这是单点使用。

Answer 1

你也可以使用 method injection :

在共享库中:

public class MyService
{
    public void ProcessAll()
    {
      foreach (ICustomInterfaceThatDoesSomething icitds in GetAllImplementers())
        icitds.DoSomething();
    }

    protected virtual IEnumerable<ICustomInterfaceThatDoesSomething> GetAllImplementers()
    {
      // note that the Spring dependency is gone
      // you can also make this method abstract, 
      // or create a more useful default implementation
      return new List<ICustomInterfaceThatDoesSomething>(); 
    }
}

在网络应用程序中添加一个实现 GetAllImplementers() 的类:

public class ServiceLocatorImplementer : IMethodReplacer
{
    protected IEnumerable<ICustomInterfaceThatDoesSomething> GetAllImplementers()
    {
        var idObjects = Spring.Context.Support.ContextRegistry.GetContext()
            .GetObjectsOfType(typeof(ICustomInterfaceThatDoesSomething));

        return idObjects.Values.Cast<ICustomInterfaceThatDoesSomething>();
    }

    public object Implement(object target, MethodInfo method, object[] arguments)
    {
        return GetAllImplementers();
    }
}

并在您的 Web 应用程序的对象定义中配置方法注入(inject):

  <objects>

    <object name="serviceLocator" 
            type="WebApp.ServiceLocatorImplementer, WebApp" />

    <object name="service" type="SharedLib.MyService, SharedLib">
      <replaced-method name="GetAllImplementers" replacer="serviceLocator" />
    </object>

  </objects>

我确实觉得使用 CommonServiceLocator 会更好(因为服务定位就是你正在做的)，但是以这种方式使用方法注入(inject)，你不需要引入额外的对 SharedLib 的引用。