调试器在 catch 语句中显示异常“未处理的用户异常”

问：

我让函数抛出一个（由我定义）异常，并且该函数是从方法的 catch 语句中调用的。 当引发异常时，调试器会显示一条消息 - 为什么？getRefreshTokenAppExceptionRefreshTokenUnhandled user exception

private (RefreshToken, Account) getRefreshToken(string token)
        {

            var account = _context.Accounts.Include(x => x.RefreshTokens).SingleOrDefault(u => u.RefreshTokens.Any(t => t.Token == token));
            //var account = _context.Accounts.SingleOrDefault(u => u.RefreshTokens.Any(t => t.Token == token));
            if (account == null)
            {
                Console.WriteLine("Exception thrown");
                throw new AppException("Invalid account for token"+ token);
            }
            var refreshToken = account.RefreshTokens.Single(x => x.Token == token);
            if (!refreshToken.IsActive)
            {
                Console.WriteLine("Exception thrown");
                throw new AppException("Invalid token:"+ token);
            }
            return (refreshToken, account);
        }

带有 catch 语句的调用方函数：

public AuthenticateResponse RefreshToken(string token, string ipAddress)
{
    log.Info("RefreshToken before locking");
    Monitor.Enter(lockObject);

    using (IDbContextTransaction transaction = _context.Database.BeginTransaction())
    {
        try
        {
            var (refreshToken, account) = getRefreshToken(token);

        }
        catch 
        {
            transaction.Rollback();
            Console.WriteLine(Thread.CurrentThread.Name + "Error occurred.");
            log.Error(Thread.CurrentThread.Name + "Error occurred in RefreshToken:");
            throw;
        }
        finally
        {
            Monitor.Exit(lockObject);
            log.Info("RefreshToken after locking");
        }
    }
}