这里的各种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,它都不会填充我解析的实例中的属性。它们始终为空。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。我所做的事情肯定有一些根本性的错误。
任何帮助是极大的赞赏。
我在互联网上遍历了很多路径,以确定如何使用 Unity 进行属性注入,但我最终还是得到了一个实例化的对象,该对象带有一个应该被注入的空属性。所以它死了。
有几个问题:
1) 这些 PropertyInjector 对象在调试器中在哪里可见?没有多少采矿揭示了这些,所以我无法确定它们是否“准备好注入”。
2) 具有该属性的对象确实通过 Resolve 实例化,但它从未获得属性值(该属性是 ILog 对象)。
我束手无策,诚然,这可能是一根短绳,但这到底是怎么回事?任何见解。
这是代码:
// (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
...
...
}
我确实在几个位置看到似乎需要使用
[Dependency]
标记属性
,而在其他地方表明这些标记将被代码中的InjectionProperty对象覆盖。讨论模棱两可。
我非常担心 Unity = DisUnity ,我什至可能会尝试使用它。