如何在ASP.NET WebAPI中返回文件(FileContentResult)
如何在ASP.NET WebAPI中返回文件(FileContentResult)
提问于 2014-09-25 20:37:01
在常规的MVC控制器中，我们可以使用FileContentResult输出pdf。
public FileContentResult Test(TestViewModel vm)
{
var stream = new MemoryStream();
//... add content to the stream.
return File(stream.GetBuffer(), "application/pdf", "test.pdf");
}但是我们如何将其更改为ApiController呢？
[HttpPost]
public IHttpActionResult Test(TestViewModel vm)
{
//...
return Ok(pdfOutput);
}以下是我尝试过的方法，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"]}]}在SO上有一个类似的帖子：Returning binary file from controller in ASP.NET Web API 。它讨论了如何输出现有的文件。但我不能让它在流中工作。
有什么建议吗？
回答 6
Stack Overflow用户
回答已采纳
发布于 2014-09-25 22:34:46
我可以让它与ByteArrayContent一起工作，而不是将StreamContent作为Content返回。
[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;
}Stack Overflow用户
发布于 2016-05-26 15:41:47
如果你想返回IHttpActionResult，你可以这样做：
[HttpGet]
public IHttpActionResult Test()
{
var stream = new MemoryStream();
var result = new HttpResponseMessage(HttpStatusCode.OK)
{
Content = new ByteArrayContent(stream.GetBuffer())
};
result.Content.Headers.ContentDisposition = new System.Net.Http.Headers.ContentDispositionHeaderValue("attachment")
{
FileName = "test.pdf"
};
result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
var response = ResponseMessage(result);
return response;
}Stack Overflow用户
发布于 2014-09-25 22:19:41
This问题帮了我大忙。
所以，试试这个：
控制器代码：
[HttpGet]
public HttpResponseMessage Test()
{
var path = System.Web.HttpContext.Current.Server.MapPath("~/Content/test.docx");;
HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
var stream = new FileStream(path, FileMode.Open);
result.Content = new StreamContent(stream);
result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
result.Content.Headers.ContentDisposition.FileName = Path.GetFileName(path);
result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
result.Content.Headers.ContentLength = stream.Length;
return result;
}查看Html标记(带有单击事件和简单的url)：
<script type="text/javascript">
$(document).ready(function () {
$("#btn").click(function () {
// httproute = "" - using this to construct proper web api links.
window.location.href = "@Url.Action("GetFile", "Data", new { httproute = "" })";
});
});
</script>
<button id="btn">
Button text
</button>
<a href=" @Url.Action("GetFile", "Data", new { httproute = "" }) ">Data</a>页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/26038856
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