C#将整数字符串拆分为IEnumerable <int>

using System;
using System.Collections.Generic;
using System.Linq;

class Program
{
    static void Main(string[] args)
    {
        string input = "123456789";
        IEnumerable<int> result = SplitStringToInt(input);
        foreach (int num in result)
        {
            Console.WriteLine(num);
        }
    }

    static IEnumerable<int> SplitStringToInt(string input)
    {
        return input.Select(c => int.Parse(c.ToString()));
    }
}