IClone接口

首先这段代码
List<int> values = new List<int>() { 1, 2, 3, 4 };
            
            List<int> values2 = new List<int>();
            foreach (var val in values) {
                values2.Add(val);
            }
            values2[0] = 99;
            Console.WriteLine(values[0]);
            Console.WriteLine(values2[0]);

class Person 
    {
        public int ID { get; set; }
        public String Name { get; set; }

        public override string ToString()
        {
            return string.Format("{0},{1}", ID, Name);
        }
    }

List<Person> persons = new List<Person>() { new Person() { ID = 1, Name = "lou" }, new Person() { ID = 2, Name = "chenting" } };
            List<Person> persons2 = new List<Person>();
            foreach (var p in persons) {
                persons2.Add(p);
            }
            persons2[0].ID = 99; persons2[0].Name = "sai";
            Console.WriteLine(persons[0]);
            Console.WriteLine(persons2[0]);

class Person : ICloneable
    {
        public int ID { get; set; }
        public String Name { get; set; }

        public override string ToString()
        {
            return string.Format("{0},{1}", ID, Name);
        }

        public object Clone()
        {
            return new Person() { ID = ID, Name = Name };
        }
    }

            foreach (var p in persons) {
                persons2.Add(p.Clone() as Person);
            }

            persons2[0].ID = 99; persons2[0].Name = "sai";
            Console.WriteLine(persons[0]);
            Console.WriteLine(persons2[0]);