如何使用indexof和substring从字符串中提取数字并生成数字的List<int>？

string inputString = "abc123def456ghi789";
List<int> numbersList = new List<int>();

int startIndex = 0;
while (startIndex < inputString.Length)
{
    int digitIndex = inputString.IndexOfAny("0123456789".ToCharArray(), startIndex);
    if (digitIndex == -1)
    {
        break;
    }

    int endIndex = digitIndex;
    while (endIndex < inputString.Length && Char.IsDigit(inputString[endIndex]))
    {
        endIndex++;
    }

    string numberString = inputString.Substring(digitIndex, endIndex - digitIndex);
    int number;
    if (int.TryParse(numberString, out number))
    {
        numbersList.Add(number);
    }

    startIndex = endIndex;
}

// 输出提取到的数字列表
foreach (int number in numbersList)
{
    Console.WriteLine(number);
}