尝试使用angular 5和asp.net内核从数据库下载文件

[HttpGet]
public HttpResponseMessage DownloadFile(int fileId)
{
    // 根据文件ID从数据库获取文件数据
    byte[] fileData = GetFileDataFromDatabase(fileId);

    // 创建HttpResponseMessage对象
    HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.OK);
    response.Content = new ByteArrayContent(fileData);

    // 设置Content-Type为文件的MIME类型
    response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");

    // 设置文件名
    response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
    response.Content.Headers.ContentDisposition.FileName = "filename.ext";

    return response;
}

import { Component } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { saveAs } from 'file-saver';

@Component({
  selector: 'app-download',
  templateUrl: './download.component.html',
  styleUrls: ['./download.component.css']
})
export class DownloadComponent {
  constructor(private http: HttpClient) { }

  downloadFile() {
    const fileId = 123; // 文件ID

    this.http.get('api/downloadFile?fileId=' + fileId, { responseType: 'blob' })
      .subscribe(response => {
        saveAs(response, 'filename.ext'); // 保存文件到本地
      });
  }
}