在常规的 MVC 控制器中,我们可以输出带有FileContentResult.
FileContentResult
public FileContentResult Test(TestViewModel vm) { var stream = new MemoryStream(); //... add content to the stream. return File(stream.GetBuffer(), "application/pdf", "test.pdf"); }
但是我们怎样才能把它变成一个ApiController?
ApiController
[HttpPost] public IHttpActionResult Test(TestViewModel vm) { //... return Ok(pdfOutput); }
这是我尝试过的,但似乎不起作用。
[HttpGet] public IHttpActionResult Test() { var stream = new MemoryStream(); //... var content = new StreamContent(stream); content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf"); content.Headers.ContentLength = stream.GetBuffer().Length; return Ok(content); }
浏览器中显示的返回结果为:
{"Headers":[{"Key":"Content-Type","Value":["application/pdf"]},{"Key":"Content-Length","Value":["152844"]}]}
SO上有一个类似的帖子:Returning binary file from controller in ASP.NET Web API 。它谈论输出现有文件。但我无法让它与流一起工作。
有什么建议么?
StreamContent而不是作为返回Content,我可以使它与ByteArrayContent.
StreamContent
Content
ByteArrayContent
[HttpGet] public HttpResponseMessage Generate() { var stream = new MemoryStream(); // processing the stream. var result = new HttpResponseMessage(HttpStatusCode.OK) { Content = new ByteArrayContent(stream.ToArray()) }; result.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment") { FileName = "CertificationCard.pdf" }; result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream"); return result; }