How to return file from ASP.net 5 web api

问题:

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
}`

Code:

    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;

    }

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

回答1:

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

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.

Continues : Return file from ASP.NET 5 Web API

Thanks

回答2:

Try this!

    [HttpGet]
    public HttpResponseMessage Get()
    {
       var fs = new FileStream(myfileInfo.FullName, FileMode.Open, FileAccess.Read, 
                                FileShare.Read, 32768, true);
            var response = this.Request.CreateResponse();
            response.Content = new StreamContent(fs);
            response.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
            response.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
            response.Content.Headers.ContentLength = fs.Length;
            fs.Dispose();
            return response;
    }

回答3:

Does setting HttpContext.Response.ContentType = "application/pdf" help at all?

This should fit your needs:

public FileResult TestDownload()
    {
        HttpContext.Response.ContentType = "application/pdf";
        FileContentResult result = new FileContentResult(System.IO.File.ReadAllBytes("YOUR PATH TO PDF"), "application/pdf")
        {
            FileDownloadName = "test.pdf"
        };

        return result;                                
    }