public class FileActionFilter : IActionFilter
    {
        public void OnActionExecuting(ActionExecutingContext context)
        {
        }

        public void OnActionExecuted(ActionExecutedContext context)
        {
            try
            {
                if (context.Result is FileStreamResult)
                {
                    var fileStreamResult = (FileStreamResult)context.Result;
                    if (fileStreamResult != null && fileStreamResult.FileStream is FileStream)
                    {
                        var fileStream = (FileStream)fileStreamResult.FileStream;
                        fileStream.Flush();
                        fileStream.Close();
                        if (fileStream.Name.Contains("\\TmpData\\") && File.Exists(fileStream.Name))
                        {
                            File.Delete(fileStream.Name);
                        }
                    }
                }
            }
            catch (Exception ex)
            {

            }
        }
    }



services.AddTransient<FileActionFilter>();
            services.AddMvc(options =>
            {
                options.Filters.AddService<FileActionFilter>();
            })