Angular2“没有提供者！”和未捕获（承诺）：错误：DI 错误

解决Angular2中的“没有提供者！”和未捕获（承诺）错误

plaintext
Error: No provider for SomeService!

typescript
// some.service.ts
import { Injectable } from '@angular/core';
@Injectable()
export class SomeService {
  // Service logic here
}

typescript
// app.module.ts
import { NgModule } from '@angular/core';
import { SomeService } from './some.service';
@NgModule({
  providers: [SomeService],
  // Other module configurations
})
export class AppModule { }

plaintext
Uncaught (in promise): SomePromiseError

typescript
// service-with-promise.ts
import { Injectable } from '@angular/core';
@Injectable()
export class ServiceWithPromise {
  somePromiseMethod(): Promise {
    return new Promise((resolve, reject) => {
      // Async operation here
      if (/* Operation is successful */) {
        resolve(/* Result */);
      } else {
        reject(new Error('SomePromiseError'));
      }
    });
  }
}

typescript
// app.component.ts
import { Component } from '@angular/core';
import { ServiceWithPromise } from './service-with-promise';
@Component({
  selector: 'app-root',
  template: `
    Perform Async Operation
  `,
})
export class AppComponent {
  constructor(private service: ServiceWithPromise) {}
  performAsyncOperation() {
    this.service.somePromiseMethod()
      .then(result => {
        // Handle successful result
      })
      .catch(error => {
        console.error('Caught an error:', error);
      });
  }
}