下载的文件作为控制器（ASP.NET MVC 3）中的流会自动处理吗？

让我们假设下载所选文件的控制器：

 public FileResult Download( string f ) {

         Stream file = MyModel.DownloadFiles( f );

         return File( file, "application/octet-stream", (file as FileStream).Name );
 }

and MyModel包含

public static Stream DownloadFiles(string file){

   return new FileStream(file, FileMode.Open, FileAccess.Read);
}

如果我使用using控制器中的关键字，则会抛出异常：Cannot access closed file.

好吧，我想确保下载的文件将被处理（我不知道是否可能，如何做到这一点）或不？

Thanks

Controller.File方法使用文件流结果里面的类，已经包含using keyword

protected override void WriteFile(HttpResponseBase response) {
    // grab chunks of data and write to the output stream
    Stream outputStream = response.OutputStream;
    using (FileStream) {
        byte[] buffer = new byte[_bufferSize];
        while (true) {
            int bytesRead = FileStream.Read(buffer, 0, _bufferSize);
            if (bytesRead == 0) {
                // no more data
                break;
            }
            outputStream.Write(buffer, 0, bytesRead);
        }
    }
}

https://github.com/ASP-NET-MVC/ASP.NET-Mvc-3/blob/master/mvc3/src/SystemWebMvc/Mvc/FileStreamResult.cs