这里的各个帖子没有说明为什么每次我尝试在Unity 2.0(4月)中使用InjectionProperty()构造时,它都不会在我已解析的实例中填充属性。它们总是空的。我可以在调试器中看到创建了对象,但是对应该注入的属性的第一个引用始终是空引用异常。在我正在做的事情中肯定存在一些非常根本的错误。
非常感谢任何帮助。
我已经遍历了Internet上的许多路径以确定如何使用Unity来执行Property Injection,我仍然最终得到一个具有null属性的实例化对象,该属性应该被注入。所以它死了。
有几个问题:
1)这些PropertyInjector对象在调试器中何处可见?没有多少采矿揭示了这些,所以我无法确定它们是否“准备注射”。
2)具有该属性的对象确实通过Resolve实例化,但它永远不会获得属性值(该属性是ILog对象)。
我在我的智慧结束,这无疑可能只是一根短绳,但这是怎么回事呢?任何见解。
以下是代码:
// (Unity 2.1, May something or other drop, so I think this is the latest )
public class RuntimeFilesRepository:IFilesRepository
{
...
...
...
// A customized version of the standard Log4Net ILog
public ILog Logger {get;set;}
...
...
public RuntimeFilesRepository()
{
...
...
// INJECTION NEEDS TO HAPPEN BEFOE THIS, BUT NEVER DOES, SO THIS IS A NULL OBJECT
Logger.Debug("I do like my CaesarSalad with the extra chicken");
}
// and the registration looks like this:**
public void WireUp()
{
...
...
// a container
ParentContainer = new UnityContainer();
// this thing is really helpful!!!
// [https://github.com/dbuksbaum/unity.extensions][1]
ParentContainer.AddNewExtension<**TypeTrackingExtension**>();
// and the Logger type
ParentContainer.RegisterType<ILog, Log4NetLog>("Logger",
new InjectionFactory(
factory => LogManager.GetLogger("Visual Element Migrator")));
// and an instance of an ILog. It can be referred to as 'LoggingService'
// to use as a resolved parameter to inject
ILog Logger = ParentContainer.Resolve<ILog>("Logger");
ParentContainer.RegisterInstance("LoggingService", Logger, new LifeTimeManager());
...
...
//various Logger log statements from the resolved ILog object work here as we plod along, by the way
...
...
// then the next statement works, type is registered, shows up in the debugger,
// but where the heck are the injection properties???
DataServicesContainer.RegisterType<IFilesRepository,RuntimeFilesRepository>(new InjectionProperty("Logger", Logger));
// I have tried 3 different variants of the above InjectionProperty() to no avail.
// runtime files repo, want a singleton
// allow Unity to resolve the RUN TIME files repositoryand hold onto reference
// DOES NOT WORK. Apparently instantiates RuntimeFilesRepository, but does not inject the ILog to the Logger property
var filesRepo = DataServicesContainer.Resolve<RuntimeFilesRepository>();
// *never gets here where I try to register the object so it can be REUSED in other contexts....*
DataServicesContainer.RegisterInstance<IFilesRepository>("FilesRepositoryDataService", filesRepo, new LifeTimeManager()); // to inject, singleton
...
...
// lots more of the same sort of class register and instantiate stuff
...
...
}
我确实在几个标有财产的地方看到了
的 [依赖]
似乎是必需的,并且在代码中使用 InjectionProperty 对象将覆盖其他表示这些标记的地方。讨论含糊不清。
我非常感到Unity = DisUnity 而且我甚至可能在试图使用它时搞砸了自己。