Custom set Initiator

Initialize the int type set, and write as follows:

static void Main(string[] args)        {            var list = new List<int> {0, 1};            foreach (var item in list)            {                Console.WriteLine(item);            }            Console.ReadKey();        }

Initialize the key-value pair set, and write as follows:

static void Main(string[] args)        {            var dic = new Dictionary<string, string>            {                {"location", "qingdao"},                {"street","lingchuang"}            };            foreach (var item in dic)            {                Console.WriteLine("{0}:{1}", item.Key, item.Value);            }            Console.ReadKey();        }

 

How does the compiler "read" The set initializer?
-- The compiler understands the set initializer according to the Convention, that is, if a type implements the ienumerable <t> interface and provides the add (Object OBJ) method, you can use the set initialization tool for this type.

 

Suppose we want to define a set of models through a set initiator, and use bust, waist circumference, and hip circumference as the parameters of the Set initiator:

var list = new MoTes{    {79, 60, 89},    {82, 63, 90}};

Like the int type, {79, 60, 89} is a data structure that defines it as a structure type:

Public struct Sanwei {public readonly double _ Xiong; Public readonly double _ Yao; Public readonly double _ Tun; // The parameter type, sequence, and quantity of the constructor determine the parameter type, sequence, and quantity of the Set initiator. Public Sanwei (double Xiong, double Yao, double Tun) {_ Xiong = Xiong; _ Yao = Yao; _ Tun = Tun ;}}

 

To enable the motes class to use the set initiator, two conditions must be met:
1. Implement the ienumerable <Sanwei> Interface
2. The add (double Xiong, double Yao, double Tun) method is provided.

public class MoTes : IEnumerable<SanWei>    {        private readonly List<SanWei> _motes;        public MoTes()        {            _motes = new List<SanWei>();        }        public void Add(double xiong, double yao, double tun)        {            _motes.Add(new SanWei(xiong, yao, tun));        }        public IEnumerator<SanWei> GetEnumerator()        {            return _motes.GetEnumerator();        }        IEnumerator IEnumerable.GetEnumerator()        {            return GetEnumerator();        }    }

On the client:

Static void main (string [] ARGs) {var list = new motes () {79, 60, 89}, {82, 63, 90 }}; foreach (VAR item in list) {console. writeline ("Bust: {0}, waist circumference: {1}, hip circumference: {2}", item. _ Xiong, item. _ Yao, item. _ Tun);} console. readkey ();}