我想，当点击一个按钮，客户端下载存储在我的数据库文件。 我把这个Ajax请求，并把它从服务器端。

I want client to download a file stored on my db when clicked a button. I send this ajax request and take it from the server side.

EXTJS：

downloadFile: function (a, b, c) {
    var feed_id =this.getMyfeedwindow().down('form').getComponent('FeedId').text;
    Ext.Ajax.request({
        url: '/Feed/Download',
        method: 'GET',
        params: {
            fileID: feed_id, //this.form.getComponent('file').value,
        },
        failure: function (response) {
            alert('failed  !');
        },
        success: function (response) {
            alert('success!');
        },
    });
},

再遇到这个code座请求。

then meet request with this code block.

C＃：

 public void Download(string fileID){
    Response.ContentType = "application/force-download";
    Response.AddHeader("Content-Disposition", "attachment; Filename=\"Logo1.jpg\"");
    Response.BinaryWrite(data);
    Response.End();
 }

当我检查网络萤火虫，看来我的请求，这些参数成功返回。

When I checked network with firebug, it seems my request returns successfully with these parameters.

Cache-Control   private
Content-Disposition attachment; filename="Logo1.jpg"
Content-Type    application/force-download
Date    Wed, 09 Jan 2013 12:51:54 GMT
Server  Microsoft-IIS/8.0
Transfer-Encoding   chunked
X-AspNet-Version    4.0.30319
X-AspNetMvc-Version 4.0
X-Powered-By    ASP.NET
X-SourceFiles   =?UTF-8?B?RTpcVXRrdUNhblxQcm9qZWN0c1xURlNcQlRPTVxCVE9NXEZlZWRcRG93bmxvYWQ=?=

虽然它返回成功，不能下载。我阅读了大量的问题和文章，但大部分的答案说加力下载头解决了这个问题。我怀念这一点？谢谢你。

Although it returns successful, download does not start. I read lots of questions and articles but most answers say adding force-download header solves the problem. Which point do I miss? Thanks.

推荐答案

要处理，你应该使用所提供的助手之一的下载

To handle a Download you should use one of the provided helper

System.Web.MVC.FilePathResult System.Web.MVC.FileStreamResult System.Web.MVC.FileContentResult

大多数时候，我使用的是 System.Web.MVC.FileStreamResult mayself。使用它像

Most times I am using the System.Web.MVC.FileStreamResult mayself. Use it like

FileStreamResult result = new FileStreamResult(stream, contentType);
result.FileDownloadName = filename; // name of the downloaded file

更新 根据您的编辑只是一些相关信息的

您可以不使用XHR请求开始下载。但至少有两种方法可以如何做到这一点：

You cannot start download using XHR request. But there are at least two ways how you can do it:

如果文件路径是固定和你知道它设置 top.location.href =YourPath; Ajax调用成功处理程序中。 [相关信息约 top.location.href] 如果您动态创建的文件，并希望返回它，你应该创建一个隐藏的iframe和形式注入到它的再执行请求。 If the file-path is fix and you know it set top.location.href = "YourPath"; within the success handler of the ajax call. [Infos about top.location.href] If you create the file on the fly and want to return it you should create a hidden iframe and inject a form into it that then execute the request.