使用Linq确定序列是否包含另一个序列的所有元素

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

class Program
{
    static void Main(string[] args)
    {
        List<int> list1 = new List<int> { 1, 2, 3, 4, 5 };
        List<int> list2 = new List<int> { 3, 4 };

        bool containsAll = list1.ContainsAll(list2);

        Console.WriteLine("List1 contains all elements of List2: " + containsAll);
    }
}

public static class Extensions
{
    public static bool ContainsAll<T>(this IEnumerable<T> source, IEnumerable<T> other)
    {
        return other.All(source.Contains);
    }
}