如何在angular8中为IformFile传递上传数据

<form (ngSubmit)="onSubmit()" #uploadForm="ngForm">
  <input type="file" name="file" (change)="onFileChange($event.target.files)">
  <button type="submit" [disabled]="!uploadForm.valid">上传文件</button>
</form>

import { Component } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Component({
  selector: 'app-upload',
  templateUrl: './upload.component.html'
})
export class UploadComponent {
  selectedFile: File;

  constructor(private http: HttpClient) { }

  onFileChange(files: FileList) {
    this.selectedFile = files.item(0);
  }

  onSubmit() {
    const formData = new FormData();
    formData.append('file', this.selectedFile);

    this.http.post('http://your-api-url/upload', formData)
      .subscribe(response => {
        console.log(response);
        // 处理上传成功的响应
      });
  }
}