@Inject自定义提供程序在Angular 2.0.1中

时间:2016-09-27 10:08:18

标签: angular typescript dependency-injection

我在Angular 2.0.1中遇到了自定义提供程序的问题。我为我的http请求创建了一个自定义提供程序,以便在每个请求的头部添加一个参数,但是当我在我的提供程序中使用它们来获取用户服务时,我会收到错误。

HttpClient (自定义)

@Injectable()
export class HttpClient {
    constructor(@Inject(Http) private _http: Http){}
}

UserServices

@Injectable()
export class UsersServices {
    constructor(@Inject(HttpClient) private _http: HttpClient) {}
}

控制台错误:

  

无法解析UsersServices的所有参数:(?)。

tsconfig.json (typescript:2.0.3)

{
     "compileOnSave": false,
     "compilerOptions": {
     "declaration": false,
     "emitDecoratorMetadata": true,
     "experimentalDecorators": true,
     "target": "es5",
     "mapRoot": "./",
     "module": "commonjs",
     "moduleResolution": "node",
     "noEmitOnError": true,
     "noImplicitAny": false,
     "outDir": "../dist",
     "sourceMap": true,
     "typeRoots": [
       "../node_modules/@types"
     ],
     "types": [
       "core-js",
       "jasmine",
       "node"
     ]
   },
   "files": [
     "main.ts",
     "typings.d.ts"
   ]
}

app.module.ts (angular:2.0.1)

 @NgModule({
     imports: [
      CommonModule,
      RouterModule,
      HttpModule
    ],
    exports: [],
    declarations: [...],
    providers: [ HttpClient, UsersServices ],
})
export class AppModule { }

1 个答案:

答案 0 :(得分:1)

在角度核心调试几个小时之后,我找到了一个解决方案,我不知道它是否正确(最好),但看起来很有效。

app.module.ts (angular:2.0.1)

 @NgModule({
     imports: [
      CommonModule,
      RouterModule,
      HttpModule
    ],
    exports: [],
    declarations: [...],
    providers: [ 
        { provide:"appHttpClient", useClass:HttpClient }
      , { provide:"appUsersServices", useClass:UsersServices }
   ]
})
export class AppModule { }

HttpClient (自定义)

@Injectable()
export class HttpClient {
    constructor(@Inject(Http) private _http: Http){}
}

<强> UserServices

@Injectable()
export class UsersServices {
    constructor(@Inject("appHttpClient") private _http: HttpClient) {}
}