如何使用LINQ确定List<T>是否为嵌套列表

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

public class Program
{
    public static bool IsNestedList<T>(List<T> list)
    {
        // 递归判断集合中的元素是否为列表类型
        foreach (var item in list)
        {
            if (item is List<T>)
            {
                return true;
            }
        }

        // 若集合中的元素均不是列表类型，则判定为非嵌套列表
        return false;
    }

    public static void Main()
    {
        List<int> list1 = new List<int> { 1, 2, 3 };
        List<List<int>> list2 = new List<List<int>> { new List<int> { 4, 5 }, new List<int> { 6, 7 } };

        Console.WriteLine("List1 is a nested list: " + IsNestedList(list1));
        Console.WriteLine("List2 is a nested list: " + IsNestedList(list2));
    }
}

List1 is a nested list: False
List2 is a nested list: True