我正在Angular 14中开发一个需要身份验证/授权的应用程序，原因是我使用**Keycloak Angular**。
我需要用当前登录用户的数据预填充一个表单。
为此，我有一项服务：

import { Injectable } from '@angular/core';
import { Observable } from 'rxjs';
import { HttpClient, HttpHeaders } from '@angular/common/http';
import { User } from '../../../models/user';

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

  httpOptions: object = {
    headers: new HttpHeaders({
      'Content-Type' : 'application/json'
    })
  }

  apiURL: string = 'http://localhost:8080';

  constructor(private http: HttpClient) { }
  
  public currentUserEmail: any;
  public currentUserData: any;

  public getUserByEmail(email: string): Observable<User>{
    return this.http.get<User>(`${this.apiURL}/getUserByEmail/${email}`, this.httpOptions);
  }

}

在组件中，我执行以下步骤：

获取用户的电子邮件：

public currentUserEmail: any;
public currentUserData: any;
public formData: any = {};

public async getUserEmail(){
    let currentUser = await this.keycloakService.loadUserProfile();
    return currentUser.email;
}

然后通过电子邮件获取 * 用户数据 *：

public async getUserByEmail() {
    this.currentUserEmail = await this.getUserEmail();

    if (this.currentUserEmail) {
      this.formService.getUserByEmail(this.currentUserEmail).subscribe(response => {
        this.currentUserData = response;
        console.log(this.currentUserData);
      });
    } 
}

尝试 * 使用用户数据预填充表单 *：

public async setFormData() {
    this.formData.first_name = await this.currentUserData.first_name;
    this.formData.last_name = await this.currentUserData.last_name;

    console.log('data: ', this.formData); 
}

我想从上面的函数中得到什么（但没有），我想预填充表单：

public form: FormGroup = new FormGroup({
    first_name: new FormControl('', Validators.required).setValue(this.formData.first_name),
    last_name: new FormControl('', Validators.required).setValue(this.formData.last_name),
  });

 
 async ngOnInit(): Promise<any> {
    // Get user's email
    this.getUserEmail();
    // Get user's data by email
    this.getUserByEmail();
    await this.setFormData();
}

问题是

setFormData()方法抛出以下错误：

Uncaught (in promise): TypeError: Cannot read properties of undefined (reading 'first_name')

表单数据的其余部分也是如此。

如何解决此问题？