Lazy<T> 延迟加载

namespace ConsoleAppTest
{
    class Program
    {
        static void Main(string[] args)
        {
            Lazy<Student> student = new Lazy<Student>();
            //默认未初始化
            Console.WriteLine(student);
            //在第一次使用时才实例化
            Console.WriteLine(student.Value);
            Console.ReadLine();
        }

        public class Student
        {
            public int ID
            {
                get; set;
            }
            public string Name
            {
                get; set;
            }
        }
    }
}