C# 如何从Controller中的文件夹下载PDF [路由（“pdfdownload”）] [HttpGet] 公共IHttpActionResult Getpdfdownload（字符串参数） { HttpResponse Response=HttpContext.Current.Response； 字符串PdfFileName=参数； 字符串路径=ConfigurationManager.AppSettings[“SISource”].ToString（）+“\\”+PdfielName； var-dataBytes=File.ReadAllBytes（路径）； var数据流=新的内存流（数据字节）； 返回新的GetPDFDownload（dataStream、Request、PdfFileName）； } 公共类GetPDFDownload:IHttpActionResult { 记忆流凝灰岩； 字符串PdfFileName； HttpRequestMessage HttpRequestMessage； HttpResponseMessage HttpResponseMessage； 公共GetPDFDownload（MemoryStream数据、HttpRequestMessage请求、字符串文件名） { bookStuff=数据； httpRequestMessage=请求； PdfFileName=文件名； } 公共系统.Threading.Tasks.Task ExecuteAsync（System.Threading.CancellationToken CancellationToken） { httpResponseMessage=httpRequestMessage.CreateResponse（HttpStatusCode.OK）； httpResponseMessage.Content=新的StreamContent（bookStuff）； httpResponseMessage.Content.Headers.ContentDisposition=新建 System.Net.Http.Headers.ContentDispositionHeaderValue（“附件”）； httpResponseMessage.Content.Headers.ContentDisposition.FileName=PdfielName； httpResponseMessage.Content.Headers.ContentType=新建 System.Net.Http.Headers.MediaTypeHeaderValue（“应用程序/pdf”）； 返回System.Threading.Tasks.Task.FromResult（httpResponseMessage）； } }

要下载任何文件，可以使用以下代码段。它很短也很简单。您可以自定义一点并使用它

[Route("pdfdownload")]
[HttpGet]
public IHttpActionResult Getpdfdownload(string parameter)
{
   HttpResponse Response = HttpContext.Current.Response;

   string PdfFileName = parameter;

   string path = ConfigurationManager.AppSettings["SISource"].ToString() + "\\" + PdfFileName; 

   var dataBytes = File.ReadAllBytes(path);

   var dataStream = new MemoryStream(dataBytes);

   return new GetPDFDownload(dataStream, Request, PdfFileName);

}


public class GetPDFDownload : IHttpActionResult
{
     MemoryStream bookStuff;
 string PdfFileName;

 HttpRequestMessage httpRequestMessage;

 HttpResponseMessage httpResponseMessage;



public GetPDFDownload(MemoryStream data, HttpRequestMessage request, string filename)
{
   bookStuff = data;

   httpRequestMessage = request;

   PdfFileName = filename;
}

public System.Threading.Tasks.Task<HttpResponseMessage> 

ExecuteAsync(System.Threading.CancellationToken cancellationToken)
{

    httpResponseMessage = httpRequestMessage.CreateResponse(HttpStatusCode.OK);

    httpResponseMessage.Content = new StreamContent(bookStuff);

    httpResponseMessage.Content.Headers.ContentDisposition = new 

    System.Net.Http.Headers.ContentDispositionHeaderValue("attachment");

    httpResponseMessage.Content.Headers.ContentDisposition.FileName = PdfFileName;

    httpResponseMessage.Content.Headers.ContentType = new 

    System.Net.Http.Headers.MediaTypeHeaderValue("application/pdf");


    return System.Threading.Tasks.Task.FromResult(httpResponseMessage);

  }
}

或者你可以这样做：

    //Route: http://localhost:56928/api/values/parameter=asdasd
    [HttpGet]
    public IActionResult Get(string parameter)
    {
        var path = @"D:\Work\"+parameter;
        var fileName = System.IO.Path.GetFileName(path);
        FileContentResult result = new FileContentResult(System.IO.File.ReadAllBytes(path), "application/octet-stream")
        {
            FileDownloadName = fileName
        };
        return result;
    }

---

FileContentResult有问题请您解释一下FileContentResult继承自ActionResult，因此它应该可以正常工作。您到底面临什么问题？IActionResult不适用于我，因此我将其更改为IHttpActionResult，因为FileContentResult表示缺少程序集引用。请给出任何示例，然后您应该返回HttpResponseMessage，而不是HttpPactionResult

public HttpResponseMessage Get（）{var path=@“D:\Work\Tryouts\split.txt”；HttpResponseMessage结果=新建HttpResponseMessage（HttpStatusCode.OK）；var stream=新建文件流（path，FileMode.Open，FileAccess.Read）；result.Content=new StreamContent（stream）；result.Content.Headers.ContentType=new MediaTypeHeaderValue（“应用程序/八位字节流”）；返回结果；}

    public HttpResponseMessage Get()
    {
        var path = @"D:\Work\Tryouts\split.txt";
        HttpResponseMessage result = new HttpResponseMessage(HttpStatusCode.OK);
        var stream = new FileStream(path, FileMode.Open, FileAccess.Read);
        result.Content = new StreamContent(stream);
        result.Content.Headers.ContentType =
            new MediaTypeHeaderValue("application/octet-stream");
        return result;
    }