重定向响应下载文件 [英] Redirect response to download file

问题描述

我有我打电话用这个很基本的js代码的通用处理程序：

I have a generic handler that I call using this very basic js code:

    var formData = new FormData();

    formData.append("fileId", this.model.get("id"));

    xhr = new XMLHttpRequest();

    xhr.open('POST', '/genericHandlers/DownloadFile.ashx');

    xhr.onload = function () {
        if (xhr.status === 200) {
            // Do something here?
        }
    }

    xhr.send(formData);

我的通用处理程序代码似乎看行给我。基本上我试图建立响应头，我还以为这时候返回的处理程序，将开始文件的下载

My generic handler code seems to look ok to me. Basically I'm attempting to build the response header and I thought that when this handler returned it would begin the download of the file.

处理代码：

   var fileId = context.Request.Form["fileId"];

   // File stored in the db as a byte array

   var file = (from f in dataContext.OneEVA_Docs_File_Storages
          where Equals(f.ID, fileId)
          select f).FirstOrDefault();

   context.Response.Clear();

   context.Response.AddHeader("Content-Type", file.ContentType);
   context.Response.AddHeader("Content-Length", file.ContentLength.ToString());

   context.Response.AddHeader("Content-Disposition", string.Format("attachment; filename={0}; size={1}", file.Name, file.ContentLength));

   context.Response.BinaryWrite(file.File_Image.ToArray());
   context.Response.Flush();

   context.Response.End();

的

XHR 请求完成后确定。这里是响应头，我回去：

The XHR request completes ok. Here is the response header I get back:

Cache-Control:private
Connection:Close
Content-Disposition:attachment; filename=Mikes File; size=1860113
Content-Length:1860113
Content-Type:image/jpeg
Date:Wed, 16 May 2012 14:08:01 GMT
Server:ASP.NET Development Server/10.0.0.0
X-AspNet-Version:4.0.30319

我是什么失踪？我在做什么错了？

What am I missing? What am I doing wrong?

推荐答案

这不会开始在浏览器中下载。这是很难用一个POST请求来实现。它不可能是一个GET请求，如果你只传递一个ID？然后，你只是做

That won't start a download in the browser. It's difficult to achieve using a POST request. Can it not be a GET request if you are only passing an id? Then you just do

document.location.href = '/genericHandlers/DownloadFile.ashx?id=' + this.model.get("id");

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