How to get request body in ActionFilterAttribute?

Question

C++ / C#

Good afternoon.
I'm trying to log incoming requests through Filters in the service.
I ran into a problem that in OnActionExecutingAsync, that in OnActionExecutedAsync I can not get the request body. A string of zero length is returned.
I'm trying to get the body like this
await actionExecutedContext.Request.Content.ReadAsStringAsync()
What am I doing wrong? and how to catch his body in the request?