c# - 通过处理程序下载 WebApi 文件

Question

我正在使用 WebAPI 下载 .pdf 文件，如下所示:

[HttpGet]
public async Task<HttpResponseMessage> DownloadFile(string id, bool attachment = true)
{
HttpResponseMessage result = null;

try
{
    MyService service = new MyService();
    var bytes = await service.DownloadFileAsync(id);

    if (bytes != null)
    {
        result = GetBinaryFile(personalDocument, string.Format("{0}.pdf", id), attachment);
    }
    else
    {
        result = new HttpResponseMessage(HttpStatusCode.NotFound);
    }
}
catch (Exception ex)
{
    throw new HttpResponseException(new HttpResponseMessage(HttpStatusCode.BadRequest) { ReasonPhrase = "ServerError" });
}

return result;
}
private HttpResponseMessage GetBinaryFile(byte[] bytes, string fileName, bool attachment)
{
HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
   // result.Content = new ByteArrayContent(bytes);
result.Content = new StreamContent(new System.IO.MemoryStream(bytes));
//result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/octet-stream");
result.Content.Headers.ContentType = new MediaTypeHeaderValue("application/pdf");
result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("inline");

if (attachment)
{
    result.Content.Headers.ContentDisposition = new ContentDispositionHeaderValue("attachment");
}

result.Content.Headers.ContentDisposition.FileName = fileName;
result.Content.Headers.ContentLength = bytes.Length;
return result;
}

现在，我看到它卡住了我的网站，所以我想更改它，并通过处理程序下载 pdf 文件，客户端可以通过任何更改路由到 IHttpHandler 吗？通过路由属性？

Answer 1

来自http://www.fsmpi.uni-bayreuth.de/~dun3/archives/task-based-ihttpasynchandler/532.html的文章帮助我实现异步处理程序。

并且通过 web.config 可以路由到以下位置:

<system.webServer>
  <modules runAllManagedModulesForAllRequests="true"></modules>
  <handlers>  
    <add
       name="DownFile"
       path="/api/downloads/MyDownload.axd"
       type="MyProject.WebApi.Handlers.MyDownloadAsyncHandler, MyProject.WebApi"
       verb="GET"/>
  </handlers>
</system.webServer>