使用LINQ将List<Object>转换为List<List<int>>

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

class Program
{
    static void Main(string[] args)
    {
        List<Object> objectList = new List<Object>
        {
            new List<int> { 1, 2, 3 },
            new List<int> { 4, 5, 6 },
            new List<int> { 7, 8, 9 }
        };

        List<List<int>> resultList = objectList
            .Select(obj => obj as List<int>) // 将每个对象转换为List<int>
            .ToList(); // 转换为List<List<int>>

        foreach (List<int> list in resultList)
        {
            foreach (int num in list)
            {
                Console.Write(num + " ");
            }
            Console.WriteLine();
        }
    }
}