c# - 使用 HTTP GET : ASP . NET CORE API 流式传输文件

Question

我已经编写了一个 Controller 来将文件下载/流式传输到客户端本地机器。除了仅生成响应正文之外，代码不会在对 url 执行 GET 时流式传输文件。

streamcontent 方法有什么问题。在调试时我找不到问题。

using System;
using System.Collections.Generic;
using System.Linq;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;
using System.Net.Http;
using System.Net;
using System.IO;
using System.Text;

namespace FileDownloaderService.Controllers
{
    [Route("api/[controller]")]
    public class FileDownloadController : Controller
    {

        [HttpGet]
        public HttpResponseMessage Get() {
            string filename = "ASPNETCore" + ".pdf";
            string path = @"C:\Users\INPYADAV\Documents\LearningMaterial\"+ filename;

            if (System.IO.File.Exists(path)) {
                HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
                var stream = new FileStream(path, FileMode.Open);
                stream.Position = 0;
                result.Content = new StreamContent(stream);
                result.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment") { FileName = filename };
                result.Content.Headers.ContentType = new System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");
                result.Content.Headers.ContentDisposition.FileName = filename;
                return result;
            }
            else
            {
                HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.Gone);
                return result;
            }
        }
        }
    }

响应:

{"version":{"major":1,"minor":1,"build":-1,"revision":-1,"majorRevision":-1,"minorRevision":-1},"content":{"headers":[{"key":"Content-Disposition","value":["attachment; filename=ASPNETCore.pdf"]},{"key":"Content-Type","value":["application/pdf"]}]},"statusCode":200,"reasonPhrase":"OK","headers":[],"requestMessage":null,"isSuccessStatusCode":true}

Answer 1

在 ASP.NET Core 中，如果要发送自定义响应，则需要使用 IActionResult。所有其他响应将被序列化(默认为 JSON)并作为响应正文发送。

引用File Streaming in ASP.NET Core的答案