Question

我正在开发一个ASP.NET Core 2.2项目，我需要使用我的浏览器下载我的Excel，但是当我正在执行我的请求时，我只是得到了一些Json。

我的Excel在流中，流不是空的！

这是我的代码：

HttpResponseMessage message = new HttpResponseMessage(HttpStatusCode.OK);
            var streamContent = new StreamContent(stream);

            streamContent.Headers.ContentType = new MediaTypeHeaderValue("application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
            streamContent.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
            streamContent.Headers.ContentDisposition.FileName = "Excel.xlsx";

            message.Content = streamContent;

            return message;

以下是我得到的回复：

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

那么，有人知道如何使用HttpResponseMessage发送我的Excel文件吗？

我可以使用Filesteam下载我的excel文件，但我不想使用这种方式，因为我无法获取任何Http错误消息（错误请求，内部等）但如果有人知道如何发送这样的信息并返回文件流，我将很高兴看到您的建议！

编辑：这是我返回FileStreamResult

时的代码

                return File(stream, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");

Answer 1

您可以从Stream读取Byte数组，并返回FileContentResult。

using System.Net.Http;
using System.Threading.Tasks;
using Microsoft.AspNetCore.Mvc;

namespace DemoWebCore.Controllers
{
    [Route("api/[controller]")]
    public class FilesController : Controller
    {
        // GET api/files/sample.png
        [HttpGet("{fileName}")]
        public async Task<ActionResult> Get(string fileName)
        {
            var cd = new System.Net.Http.Headers.ContentDispositionHeaderValue("inline")
            {
                FileName = "Excel.xlsx"
            };
            Response.Headers.Add("Content-Disposition", cd.ToString());
            StreamContent stream = YOUR_STREAM_SOURCE
            byte[] content = await stream.ReadAsByteArrayAsync();
            return File(content, "application/vnd.openxmlformats-officedocument.spreadsheetml.sheet");
        }
    }
}

Answer 2

    async Task<bool> DownloadDocument(string authorizationToken, string fileName)
    {
        try
        {
            string url = "yoururl":
            using (var httpClient = new HttpClient())
            {
                httpClient.DefaultRequestHeaders.Authorization = new AuthenticationHeaderValue("Bearer", authorizationToken);
                HttpResponseMessage response = await httpClient.GetAsync(url);
                await ReadAsFileAsync(response.Content, fileName, true);
                return true;
            }

        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
            return false;
        }

从HttpResponseMessage获取Excel文件

2 个答案: