如何使用react js和asp.net core v3.0下载文件

import React from 'react';

class FileDownload extends React.Component {
  handleDownload = () => {
    fetch('/api/download', {
      method: 'GET',
    })
      .then(response => response.blob())
      .then(blob => {
        const url = window.URL.createObjectURL(new Blob([blob]));
        const link = document.createElement('a');
        link.href = url;
        link.setAttribute('download', 'file.txt');
        document.body.appendChild(link);
        link.click();
        link.remove();
      })
      .catch(error => {
        console.error('Error:', error);
      });
  };

  render() {
    return (
      <button onClick={this.handleDownload}>Download File</button>
    );
  }
}

export default FileDownload;

using Microsoft.AspNetCore.Mvc;
using System.IO;

[Route("api/[controller]")]
[ApiController]
public class DownloadController : ControllerBase
{
    [HttpGet]
    public IActionResult DownloadFile()
    {
        var filePath = "path/to/file.txt"; // 替换为实际的文件路径

        var fileStream = new FileStream(filePath, FileMode.Open, FileAccess.Read);
        var fileContentResult = new FileStreamResult(fileStream, "application/octet-stream")
        {
            FileDownloadName = "file.txt"
        };

        return fileContentResult;
    }
}