如何从 ASP.net 5 web api 返回文件 [英] How to return file from ASP.net 5 web api

问题描述

在 asp.net 5 中创建了 wep api.我想为 Post 请求返回文件响应.但是，而不是文件的响应看起来像`

Created wep api in asp.net 5. I am tring to return file response for Post request. But instead of file the response looks like `

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

代码:

    public HttpResponseMessage Post([FromBody]DocumentViewModel vm)
    {
        try
        {
            if (ModelState.IsValid)
            {

                var Document = _repository.GetDocumentByGuid(vm.DocumentGuid, User.Identity.Name);
                var Params = Helper.ClientInputToRealValues(vm.Parameters, Document.DataFields);
                var file = Helper.GeneratePdf(Helper.InsertValues(Params, Document.Content));                 

                var result = new HttpResponseMessage(HttpStatusCode.OK)
                {
                    Content = new ByteArrayContent(System.IO.File.ReadAllBytes(file))
                };
                result.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment")
                {
                    FileName = "test.pdf"
                };
                result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");
                return result;

            }

        }
        catch (Exception ex)
        {
            Response.StatusCode = (int)HttpStatusCode.BadRequest;
            return null;
        }
        Response.StatusCode = (int)HttpStatusCode.BadRequest;
        return null;

    }

如何将真实文件作为响应而不是 JSON 返回?我使用 Postman 作为测试客户端.

How can I return the real file as the response instead of JSON ?I am using Postman as test client.

推荐答案

使用 IActionResult 而不是 HttpResponseMessage.并返回 FileStreamResult，并使其正常工作.

used IActionResult instead of HttpResponseMessage. And returned FileStreamResult, and got it working.

遇到一个新问题，该文件不是我用来自服务器的流打开的文件.但是会为此创建一个新问题.

Got a new problem, the file is not the one I open with the stream from server. But will create a new question for that.

继续:从 ASP.NET 5 Web API 返回文件

谢谢

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