清理IDisposposable问题

        try
        {
            enumerator = matchs.GetEnumerator();
            while (enumerator.MoveNext())
            {
                IEnumerator enumerator2;
                Match current = (Match) enumerator.Current;
                num = 0;
                try
                {
                    enumerator2 = current.Groups.GetEnumerator();
                    while (enumerator2.MoveNext())
                    {
                        Group group = (Group) enumerator2.Current;
                        strArray[num, num3] = group.Value;
                        num++;
                    }
                }
                finally
                {
                    if (enumerator2 is IDisposable)
                    {
                        (enumerator2 as IDisposable).Dispose();
                    }
                }
                if (num2 < num3)
                {
                    num2 = num3;
                }
                num3++;
            }
        }
        finally
        {
            if (enumerator is IDisposable)
            {
                (enumerator as IDisposable).Dispose();
            }
        }
        strArray[num, 0] = Conversions.ToString((int) (num2 + 1));
        return strArray;
    }