如何下载我的文件夹中的文件 c# ASP.NET Web API？

Question

I need a download file in my C:\fileName .

I am send to fileName this class but it does not working? Where is my error?

This is my code:

// POST: api/Calendar/DownloadFile
[HttpPost]
public HttpResponseMessage DownloadFile(DownloadInput fileName)
{
        var result = new HttpResponseMessage(HttpStatusCode.OK);
        var filePath = HttpContext.Current.Server.MapPath(@"C:\" + fileName);
        var fileBytes = File.ReadAllBytes(filePath);
        var fileMemStream = new MemoryStream(fileBytes);
        result.Content = new StreamContent(fileMemStream);
        var headers = result.Content.Headers;
        headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
        headers.ContentDisposition.FileName = fileName;
        headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
        headers.ContentLength = fileMemStream.Length;

        return result;
}

This is my error:

ExceptionType: "System.NotImplementedException"
Message: "An error has occurred."

Answer 1

The below is for MVC:

  public ActionResult DownloadFile(string fileWithFullPath)
    {                
        var fileBytes = System.IO.File.ReadAllBytes(fileWithFullPath);    
        return File(fileBytes, MediaTypeNames.Application.Octet, fileName);
    }

The below is for API:

public ActionResult DownloadFile()
{
            var result = new HttpResponseMessage(HttpStatusCode.OK);
            var stream = new FileStream(fullyQualifiedFileName, FileMode.Open);
            result.Content = new StreamContent(stream);
            result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");
            result.Content.Headers.ContentLength = stream.Length;

            string input = $"filename=test.pdf";
            ContentDispositionHeaderValue contentDisposition = null;
            if (ContentDispositionHeaderValue.TryParse(input, out contentDisposition))
            {
                result.Content.Headers.ContentDisposition = contentDisposition;
            }

            return this.ResponseMessage(result);
}

Answer 2

Based on what you are showing here, the parameter DosyaAdi is a string and it is not clear what DownloadInput is. I would suggest changing the input parameter to a string and also changing the Method to HttpGet. The second suggestion is for convention and probably not the issue.

// GET: api/Calendar/DownloadFile
[HttpGet]
public HttpResponseMessage DownloadFile(string DosyaAdi)...

good luck