如何在asp.net核心的ActionFilter中刷新响应？

Question

我正在尝试使用ActionFilter删除在我的控制器上动态生成的文件。

public class DeleteFileAttribute : ActionFilterAttribute {
    public override void OnActionExecuted(ActionExecutedContext context) {
        /* MVC 4 code which worked just fine
        context.HttpContext.Response.Flush();

        var filePathResult = context.Result as FilePathResult;

        if(filePathResult!=null){
            File.Delete(filePathResult.FileName);
        }
        End of MVC 4 code */

        // I am not able to flush response as context.HttpContext.Response does not have a Flush method
        var vb = (context.Controller as Controller).ViewBag;
        string fileToDelete = vb.FileToDelete;

        if(File.Exists(fileToDelete)) {
            // ERROR: Process cannot access the file ... because it is being used by another process
            File.Delete(fileToDelete);
        }
    }
}

正如代码注释中所提到的，由于我无法刷新响应然后删除文件，我得到IOException: The process cannot access the file ... because it is being used by another process例外。

在用户完成下载后，在操作过滤器中删除文件的确切方法是什么？

Answer 1

在操作过滤器中使用OnResultExecuted事件代替OnActionExecuted解决了该问题。不需要刷新响应。