public async Task <OperationalResult <bool> > IsExist(Operational <UserQueryModel> operational, CancellationToken cancellationToken = default)
{
var queryModel = operational.Parameter;
Expression <Func <User, bool> > expression = p => p.No == queryModel.UserNo;
var count = await _userStore.CountAsync(expression, cancellationToken);
return(OperationalResult <bool> .Ok(count > 0));
}
