Fetch data From LocalHost API with ReactJs

Question

I created an API with .Net API and I tested it with Postman and results show up perfectly. Now I'm trying to get data from this local API in my react js application so I tried this code :

import React from "react";
  import PropTypes from "prop-types";
import { withStyles } from "@material-ui/core/styles";

 class MyComponent extends React.Component {
  constructor(props) {
    super(props);
    this.state = {
      error: null,
      isLoaded: false,
      items: []
    };
  }

  componentDidMount() {
    fetch("http://localhost:51492/api/user/1")
      .then(res => res.json())
      .then(
        (result) => {
          this.setState({
            isLoaded: true,
            items: result.items
          });
        },
        // Note: it's important to handle errors here
        // instead of a catch() block so that we don't swallow
        // exceptions from actual bugs in components.
        (error) => {
          this.setState({
            isLoaded: true,
            error
          });
        }
      )
  }

  render() {
    const { error, isLoaded, items } = this.state;
    if (error) {
      return <div>Error: {error.message}</div>;
    } else if (!isLoaded) {
      return <div>Loading...</div>;
    } else {
      return (
        <ul>
          {items.map(item => (
            <li key={item.id}>
              {item.name} {item.prenom}
            </li>
          ))}
        </ul>
      );
    }
  }
}
MyComponent.propTypes = {
  classes: PropTypes.object.isRequired
};

export default withStyles()(MyComponent);

The link of my API is : http://localhost:51492/api/user/1

The result when I run my project with npm start (using Visual Studio Code) is empty, no data fetched ..

Can someone help me please?