下载的文件，如控制器（ASP.NET MVC 3）流将自动处理？ [英] The downloaded file as stream in controller (ASP.NET MVC 3) will automatically disposed?

问题描述

让我们假设控制器，下载选定的文件：

Let's assume the controller which download selected file:

 public FileResult Download( string f ) {

         Stream file = MyModel.DownloadFiles( f );

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

和为MyModel 包含

public static Stream DownloadFiles(string file){

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

如果我用使用关键字控制器那么将引发异常： 无法访问关闭的文件

If I use using keyword in controller then the exception will be thrown: Cannot access closed file.

好吧，我想，以确保下载的文件进行处理（我不知道是否是可能的，如何做到这一点）或不？

Well, I want to be sure that downloaded file will be disposed (I don't know if is possible, how to do that) or not ?

感谢

推荐答案

Controller.File方法使用的 FileStreamResult 类里面，已经包含是关键字

Controller.File method uses FileStreamResult class inside, that already contains 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);
        }
    }
}

<一个href=\"https://github.com/ASP-NET-MVC/ASP.NET-Mvc-3/blob/master/mvc3/src/SystemWebMvc/Mvc/FileStreamResult.cs\">https://github.com/ASP-NET-MVC/ASP.NET-Mvc-3/blob/master/mvc3/src/SystemWebMvc/Mvc/FileStreamResult.cs

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