C#对List排序的三种方式的比较

对List排序，有三种方式，自定义比较器、lamda排序、自定义方法排序。以下是源码:

using System;
using System.Collections.Generic;

namespace CustomDLL
{
    public class PeopleCompare : IComparer<People>
    {
        public int Compare(People x, People y)
        {
            return x.age.CompareTo(y.age);
        }
    }

    public class People
    {
        public int age;
    }

    public class City
    {
        List<People> allPeople = new List<People>();

        PeopleCompare peopleCompare = new PeopleCompare();
        //自定义比较器排序
        public void SortPeopleFun1()
        {
            allPeople.Sort(peopleCompare);
        }

        //Lamda排序
        public void SortPeopleFun2()
        {
            allPeople.Sort((a, b) => { return a.age.CompareTo(b.age); });
        }

        //自定义方法排序
        public void SortPeopleFun3()
        {
            allPeople.Sort(Sort);
        }

        int Sort(People a, People b)
        {
            return a.age.CompareTo(b.age);
        }
    }
}

生成dll,通过反编译查看下这三种方式的区别:

观察源码行数和反编译的结果，可以发现，自定义方法对List排序应该被优先选择的。