在asp.net/mvc中的控制器内的动作中为http响应添加标头

Question

我正在将数据从服务器传输到客户端以供下载使用filestream.write.在这种情况下,发生的事情是我能够下载该文件,但它不会在我的浏览器中显示为下载."另存为"弹出窗口不会出现在"下载"部分中的"下载栏"中.从四处查看,我想我需要在响应标题中包含"something"来告诉浏览器这个响应有一个附件.我也想设置cookie.要做到这一点,这就是我在做的事情:

        [HttpContext.Current.Response.AppendHeader("Content-Disposition","attachment;filename=" & name)]
    public ActionResult Download(string name)
    {
          // some more code to get data in inputstream.

          using (FileStream fs = System.IO.File.OpenWrite(TargetFile))
            {
                byte[] buffer = new byte[SegmentSize];
                int bytesRead;
                while ((bytesRead = inputStream.Read(buffer, 0, SegmentSize)) > 0)
                {
                    fs.WriteAsync(buffer, 0, bytesRead);
                }
            }
        }
        return RedirectToAction("Index");
    }

我收到错误:"System.web.httpcontext.current是一个属性,用作类型."

我在正确的位置更新标题吗？有没有其他方法可以做到这一点？

Answer 1

是的,你这样做是错误的尝试这个,你应该在你的行动中添加标题而不是作为方法的属性标题.

HttpContext.Current.Response.AppendHeader("Content-Disposition","attachment;filename=" & name)

要么

Request.RequestContext.HttpContext.Response.AddHeader("Content-Disposition", "Attachment;filename=" & name)

更新 据我所知,您正在通过直接调用操作对您的控制器/操作进行ajax调用,这对于文件下载不起作用.你可以通过这种方式实现它.

public void Download(string name)
        {
//your logic. Sample code follows. You need to write your stream to the response.

            var filestream = System.IO.File.ReadAllBytes(@"path/sourcefilename.pdf");
            var stream = new MemoryStream(filestream);
            stream.WriteTo(Response.OutputStream);
            Response.AddHeader("Content-Disposition", "Attachment;filename=targetFileName.pdf");
            Response.ContentType = "application/pdf";
        }

要么

    public FileStreamResult Download(string name)
    {
        var filestream = System.IO.File.ReadAllBytes(@"path/sourcefilename.pdf");
        var stream = new MemoryStream(filestream);


        return new FileStreamResult(stream, "application/pdf")
        {
            FileDownloadName = "targetfilename.pdf"
        };
    }

在JS按钮单击中,您可以执行与此类似的操作.

 $('#btnDownload').click(function () {
            window.location.href = "controller/download?name=yourargument";
    });

Answer 2

请在这里看看。

以下是从引用的网站上获取的。

public FileStreamResult StreamFileFromDisk()
{
    string path = AppDomain.CurrentDomain.BaseDirectory + "uploads/";
    string fileName = "test.txt";
    return File(new FileStream(path + fileName, FileMode.Open), "text/plain", fileName);
}

编辑1：

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public ActionResult Download()
{
    var document = ...
    var cd = new System.Net.Mime.ContentDisposition
    {
        // for example foo.bak
        FileName = document.FileName, 

        // always prompt the user for downloading, set to true if you want 
        // the browser to try to show the file inline
        Inline = false, 
    };
    Response.AppendHeader("Content-Disposition", cd.ToString());
    return File(document.Data, document.ContentType);
}