无法注入 ActivatedRouteSnapshot

Question

将 ActivatedRouteSnapshot 注入组件不起作用（注入 ActivatedRoute 也不起作用）。这里是堆栈跟踪：

"Error: Can't resolve all parameters for ActivatedRouteSnapshot: (?, ?, ?, ?, ?, ?, ?, ?, ?, ?, ?).
at SyntaxError.ZoneAwareError (http://localhost:4200/polyfills.bundle.js:7042:33)
at SyntaxError.BaseError [as constructor] (http://localhost:4200/vendor.bundle.js:73735:16)
at new SyntaxError (http://localhost:4200/vendor.bundle.js:6140:16)
at CompileMetadataResolver._getDependenciesMetadata (http://localhost:4200/vendor.bundle.js:19345:31)
at CompileMetadataResolver._getTypeMetadata (http://localhost:4200/vendor.bundle.js:19220:26)
at CompileMetadataResolver._getInjectableMetadata (http://localhost:4200/vendor.bundle.js:19208:21)
at CompileMetadataResolver.getProviderMetadata (http://localhost:4200/vendor.bundle.js:19450:40)
at http://localhost:4200/vendor.bundle.js:19408:49
at Array.forEach (native)
at CompileMetadataResolver._getProvidersMetadata (http://localhost:4200/vendor.bundle.js:19375:19)
at CompileMetadataResolver.getNonNormalizedDirectiveMetadata (http://localhost:4200/vendor.bundle.js:18848:30)
at CompileMetadataResolver._loadDirectiveMetadata (http://localhost:4200/vendor.bundle.js:18736:23)
at http://localhost:4200/vendor.bundle.js:18937:54
at Array.forEach (native)
at CompileMetadataResolver.loadNgModuleDirectiveAndPipeMetadata (http://localhost:4200/vendor.bundle.js:18936:41)"

---

在组件中，ActivatedRouteSnapshot的注入方式如下：

constructor([...], private router: Router,
          private route: ActivatedRouteSnapshot) {
    [...]
}

---

app.component.ts中提供了ActivatedRouteSnapshot：

@Component({
    selector: 'app-root',
    templateUrl: './app.component.html',
    styleUrls: ['./app.component.css'],
    providers: [[...], ActivatedRouteSnapshot]
})

---

我正在尝试访问查询参数，类似于在此处完成的方式：https://stackoverflow.com/a/38997116/3433306

根据文档，它应该像将它添加到构造函数参数一样简单：https://angular.io/docs/ts/latest/api/router/index/ActivatedRouteSnapshot-interface.html

成功注入 ActivatedRouteSnapshot 缺少什么？

Answer 1

使用 ActivatedRoute 代替 ActivatedRouteSnapshot。然后你可以像这样使用快照：

constructor(activatedRoute: ActivatedRoute) { 
  var snapshot = activatedRoute.snapshot;
}