我正在尝试学习 angular 14 的变化，尤其是 inject() 功能，我可以将模块注入到函数中，我不需要为此创建特殊服务.. 但我想我得到了出了点问题。

我正在尝试创建一些静态函数来使用包 ngx-toastr 发送零食消息，但这个包与我的问题无关。如何正确实现显示零食消息的功能，同时向它们注入它们需要操作的所需模块。

这是我的 messages.ts 文件：

import {inject} from '@angular/core';
import {ToastrService} from 'ngx-toastr';


export const snackMsgSuccess = (msg: string, title?: string) => {
  const toaster = inject(ToastrService);
  toaster.success(msg, title, {
    easeTime: 1000
  });
};


export const snackMsgInfo = (msg: string, title?: string) => {
  const toaster = inject(ToastrService);
  toaster.info(msg, title, {
    easeTime: 1000
  });
};

export const snackMsgWarn = (msg: string, title?: string) => {
  const toaster = inject(ToastrService);
  toaster.warning(msg, title, {
    easeTime: 1000
  });
};


export const snackMsgError = (msg: string, title?: string) => {
  const toaster = inject(ToastrService);
  toaster.error(msg, title, {
    easeTime: 1000
  });
};

我收到以下错误：

Error: Uncaught (in promise): Error: NG0203: inject() must be called from an injection context (a constructor, a factory function or a field initializer)

嗯...我在尝试使用支持功能来获取路由参数之前遇到了问题：

export const routeParam$ = (key: string) => {
  const activatedRoute = inject(ActivatedRoute);

  return activatedRoute.params.pipe(
    pluck(key),
    filter(r => r !== null),
    distinctUntilChanged()
  );
};

而我只能在带有 task: Observable<string> = routeParam$('task'); 的组件中用作字段初始值设定项

嗯，错误信息很清楚......但仍然......我是 angular14 的新手，我认为注入可以让我这样做。否则对我没那么有用。

现在我将它作为服务移动..

import {Injectable} from '@angular/core';
import {ToastrService} from 'ngx-toastr';

@Injectable({
  providedIn: 'root'
})
export class MsgService {

  constructor(private toaster: ToastrService) {
  }

  public snackMsgSuccess = (msg: string, title?: string) => {
    this.toaster.success(msg, title, {
      easeTime: 1000
    });
  };


  public snackMsgInfo = (msg: string, title?: string) => {
    this.toaster.info(msg, title, {
      easeTime: 1000
    });
  };

  public snackMsgWarn = (msg: string, title?: string) => {
    this.toaster.warning(msg, title, {
      easeTime: 1000
    });
  };


  public snackMsgError = (msg: string, title?: string) => {
    this.toaster.error(msg, title, {
      easeTime: 1000
    });
  };
}

但这是实现它的唯一方法吗？即使在 angular14 中？