参考：https://www.bilibili.com/video/BV1TJ411h7cZ?p=237

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

namespace ConsoleApplication1
{
    class Program
    {
        static void Main(string[] args)
        {
            //初始化器可以分为对象的初始化器、集合的初始化器等
            //后面创建了一个 StudentName 类
            //1.类的初始化器的使用
            //下面的语句调用了StudentName 类的初始化器，初始化器是如何工作的呢？它会先使用默认的构造函数创建类，然后进行初始化
            var student1 = new StudentName { firstName = "zun", lastName = "wang" };
            //上面的语句和var student1 = new StudentName() { firstName = "zun", lastName = "wang" };一个效果
            //也可以如下面这样使用，其先调用有参数的构造函数，然后调用初始化器
            var student2 = new StudentName("zun","wang") { ID = 1};
            //使用初始化器的时候默认构造函数一定要是public 才可以被调用到
            Console.WriteLine();

            //2.匿名类的初始化器
            //所谓匿名类如下创建
            var student3 = new { Name = "wang", Age = 10 };
            //里面有一个匿名类创建后给了student3变量，注意匿名类是只读的，不可以赋值
            //这个匿名类在Linq语句中使用到了
            //如使用join 语句的时候
            //from j in Collection
            //join f in Collection1 on j.Name equals f.Name
            //select new {Name = j.Name, Age = f.Age, ID = j.ID}

            //3.集合的初始化器
            var studentList = new List<StudentName> {
                new StudentName {firstName = "zhuang", lastName = "wang"},
                new StudentName("mei", "zhang"){ID = 100}
            };

            Dictionary<int, StudentName> Dic = new Dictionary<int, StudentName>
            {
                {1, new  StudentName("mei", "zhang"){ID = 100}},
                {2, new  StudentName("hua", "han"){ID = 101}}
            };
            Console.WriteLine(studentList[0].ToString());
            Console.WriteLine(Dic[2].ToString());

            Console.ReadKey();
        }

    }
      //创建一个类
    public class StudentName
    {
        public string firstName { get; set; }
        public string lastName { get; set; }
        public int ID { get; set; }

        public StudentName()
        {

        }

        public StudentName(string fName, string lName)
        {
            firstName = fName;
            lastName = lName;
        }

        public override string ToString()
        {
            return firstName + "." + lastName;
        }
    }
}