public async ValueTask <ListKeyValuePair <int, string> > AreaIdAsync(CallContext context = default)
{
_logger.LogTrace("Query: " + GetType().FullName + "." + System.Reflection.MethodBase.GetCurrentMethod()?.Name);
var areaRepository = await _s7AreaRepository.GetAllAreaAsync();
var areaDns = areaRepository.ToList().Select(
area =>
new KeyValuePair <int, string>(area.Id, area.AreaName))
.ToList();
return(new ListKeyValuePair <int, string>(areaDns));
}