下载的文件作为控制器（ASP.NET MVC 3）流将自动设置？(The downloaded fi

让我们假设其下载所选文件控制器：

 public FileResult Download( string f ) {

         Stream file = MyModel.DownloadFiles( f );

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

和MyModel包含

public static Stream DownloadFiles(string file){

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

如果我用using在控制器那么将引发异常关键字： Cannot access closed file 。

嗯，我想，以确保下载的文件将设置（我不知道是否是可能的，如何做到这一点），或不？

谢谢

Answer 1:

Controller.File方法使用FileStreamResult类里面，已经包含使用关键字

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

文章来源: The downloaded file as stream in controller (ASP.NET MVC 3) will automatically disposed?