如何在 ASP.NET WebAPI 中返回文件 (FileContentResult) [英] How to return a file (FileContentResult) in ASP.NET WebAPI
问题描述
在常规的 MVC 控制器中,我们可以输出带有 FileContentResult
的 pdf.
In a regular MVC controller, we can output pdf with a 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改成一个ApiController
?
But how can we change it into an ApiController
?
[HttpPost]
public IHttpActionResult Test(TestViewModel vm)
{
//...
return Ok(pdfOutput);
}
<小时>
这是我尝试过的,但似乎不起作用.
Here is what I've tried but it doesn't seem to work.
[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);
}
浏览器显示的返回结果为:
The returned result displayed in the browser is:
{"Headers":[{"Key":"Content-Type","Value":["application/pdf"]},{"Key":"Content-Length","Value":["152844"]}]}
SO 上也有类似的帖子:从 ASP.NET Web API 中的控制器返回二进制文件.它谈论输出现有文件.但我无法让它与流一起工作.
And there is a similar post on SO: Returning binary file from controller in ASP.NET Web API . It talks about output an existing file. But I could not make it work with a stream.
有什么建议吗?
推荐答案
不是将 StreamContent
作为 Content
返回,我可以使用 ByteArrayContent代码>.
Instead of returning StreamContent
as the Content
, I can make it work with 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;
}
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