angular-cn/public/docs/js/latest/api/di/DependencyAnnotation-class.jade

p.location-badge.
  exported from <a href='../di'>angular2/di</a>
  defined in <a href="https://github.com/angular/angular/tree/master/modules/angular2/src/di/annotations_impl.ts#L72-L105">angular2/src/di/annotations_impl.ts (line 72)</a>

:markdown
  `DependencyAnnotation` is used by the framework to extend DI.
  
  Only annotations implementing `DependencyAnnotation` are added to the list of dependency
  properties.
  
  For example:
  
  ```
  class Parent extends DependencyAnnotation {}
  class NotDependencyProperty {}
  
  class AComponent {
    constructor(@Parent @NotDependencyProperty aService:AService) {}
  }
  ```
  
  will create the following dependency:
  
  ```
  new Dependency(Key.get(AService), [new Parent()])
  ```
  
  The framework can use `new Parent()` to handle the `aService` dependency
  in a specific way.
  
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