In the realm of Angular and TypeScript, one may encounter an error stating that '"void' cannot be assigned to a parameter of type '(value: Object) => void"

I’m facing difficulties in resolving this issue. I created a web API using .NET, and now I’m attempting to call this API in an Angular project.

//movie.ts 
export class Movie{
    ID: number;
    Title: number;
    GenreId: number;
    Duration: number;
    RatingScore: number;
    PublishDate: Date;
}

//movieservice.ts
import { Injectable, Inject } from "@angular/core";
import {HttpClient} from "@angular/common/http"
import {} from "@angular/core/"
import { Movie } from "../models/movie";

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

  constructor(private httpClient: HttpClient, @Inject("url") private url: string) { }

    GetAll() {
        return this.httpClient.get(this.url + "Movies");
      }
      GetSingle(id: number) {
        return this.httpClient.get(this.url + "Movies/" + id);
      }
      PostAdd(personel: Movie) {
        return this.httpClient.post(this.url + "Movies", personel);
      }
      PutUpdate(personel: Movie) {
        return this.httpClient.put(this.url + "Movies/", personel);
      }
      Remove(id: number) {
        return this.httpClient.delete(this.url + "Movies?id=" + id);
      }
}

//appmovie.component.ts
import { Component, OnInit } from '@angular/core';
import {Movie} from "../../models/movie"
import { MovieserviceeService } from 'src/app/services/movieservicee.service';

@Component({
  selector: 'app-appmovie',
  templateUrl: './appmovie.component.html',
  styleUrls: ['./appmovie.component.css']
})
export class AppmovieComponent implements OnInit {
  movieList: Movie[];
  movie: Movie;
  constructor(private MovieserviceeService: MovieserviceeService){}
  ngOnInit(): void {
    throw new Error('Method not implemented.');
  }

  GetAll()
  {
    this.MovieserviceeService.GetAll().subscribe((response: Movie[]) => {this.movieList = response; });
  }

}

Upon running the code, I encountered the following error:

No overload matches this call... https://i.sstatic.net/vUXjf.png

Answer №1

Employing generics within the service:

 FetchAllItems() {
        return this.httpClient.obtain<Product[]>(this.link + "Products");
      }

Answer №2

This particular issue arises when an attempt is made to pass a function of an incompatible type to an Angular Observable.

To tackle this problem, it is essential to verify that the function being passed aligns with the expected type of the Observable's parameter. It appears that the Observable requires a function that accepts an Object as a parameter, whereas the current function being passed takes an array of Movie objects.

To rectify this situation, one could modify the function's parameter type to Object or adjust the Observable to anticipate an array of Movie objects rather than just an Object.

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