c＃学习_第二弹

1、

using System;

namespace ConsoleApp1
{
    
    internal class Program
    {
    
        static void Main(string[] args)
        {
    
            Digit dig = new Digit(7);
            double num = dig;
            Digit dig2 = 12;
            Console.WriteLine("num = {0}, dig2 = {1}", num, dig2.val);
            Console.ReadLine();
        }
    }

    class Digit
    {
    
        public Digit(double d)
        {
    
            val = d;
        }

        public double val;

        public static implicit operator double(Digit d)
        {
    
            return d.val;
        }
        public static implicit operator Digit(double d)
        {
    
            return new Digit(d);
        }
    }
}

2、

using System;
using System.IO;
using System.Xml.Serialization;

namespace ConsoleApp1
{
    
    internal class Program
    {
    
        static void Main(string[] args)
        {
    
            Person p1 = new Person();
            p1.Name = "Stacey";
            p1.Age = 30;
            var xs = new XmlSerializer(typeof(Person));
            using (Stream s = File.Create("person.xml"))
            {
    
                xs.Serialize(s, p1);
            }

            Person p2 = new Person();
            using (Stream s = File.OpenRead("person.xml"))
            {
    
                p2 = (Person)xs.Deserialize(s);
            }
            Console.WriteLine(p2.Name + " " + p2.Age);
            Console.ReadLine();
        }
    }

    public class Person
    {
    
        public string Name {
     get; set; }
        public int Age {
     get; set; }
    }
}