Tim:
Yes. Refreshguid can be used in Question or Form. Can you help submit BZ to record the issue in VFR spec?

Thanks
Liming

-----邮件原件-----
发件人: tosubbounce+34241+0+0+0@groups.io
<tosubbounce+34241+0+0+0@groups.io> 代表 Tim Crawford
发送时间: 2020年11月5日 0:25
收件人: gaoliming <gaoliming@...>; discuss@edk2.groups.io
主题: Re: [edk2-discuss] 回复: [edk2-discuss] Refresh currently displayed
form

BootManager elements are generated dynamically. There are no questions or
actions to attach a refresh interval or refreshguid to. I don't believe a refresh
interval would produce the behavior I want; that is, to update *as soon as*
an event (plugging/pulling a USB drive) happens.

But after looking at ANTLR syntax
(BaseTools/Source/C/VfrCompile/VfrSyntax.g) I found that refreshguid can be
used at the form level. This was added some time ago [1], but is not in the
VFR specification [2]. Using this with CreateEventEx(), with refreshguid and
EventGroup being the same GUID, produces the behavior I want.

[1]
https://github.com/tianocore/edk2/commit/e2a5feb9d6c468c0ddb0caed258
1d10585819db5
[2]
https://edk2-docs.gitbook.io/edk-ii-vfr-specification/2_vfr_description_in_bnf
/211_vfr_form_definition

Thanks,
Tim