C# List的使用

一、List排序

采用自定义Sort比较器和Linq

class Persion
    {
        public string name;
        public int age;
}
//自定义Sort方法
private static void sortListClass()
        {
            Persion p1 = new Persion() { name = "huyong", age = 27 };
            Persion p2 = new Persion() { name = "tansha", age = 25 };
            List<Persion> listPersion = new List<Persion>();
            listPersion.Add(p1);
            listPersion.Add(p2);
            listPersion.Sort(sortage);
            foreach (var item in listPersion)
            {
                Console.WriteLine(item.name + ":" + item.age);
            }
        }
        static int sortage(Persion x, Persion y)
        {
            if (x.age < y.age) return -1;                //按age从大到小 降序排列
            else if (x.age == y.age) return 0;
            else return 1;
        }
//linq方法
 private static void sortLinq()
        {
            Persion p1 = new Persion() { name = "huyong", age = 27 };
            Persion p2 = new Persion() { name = "tansha", age = 25 };
            Persion p3 = new Persion() { name = "tansha", age = 27 };
            List<Persion> listPersion = new List<Persion>();
            listPersion.Add(p1);
            listPersion.Add(p2);
            listPersion.Add(p3);

 var lList = from t in listPersion where (t.age == 27) orderby t.name ascending select t;
            foreach (var item in lList)
            {
                Console.WriteLine(item.name + ":" + item.age);
            }
        }
//或者
listPersion =listPersion.OrderBy(p=>p.name).ToList();

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