扩展方法的实例应用

给People添加一个扩展方法，打印出people的所有属性

using System;
public class ExtendMethod
{
    public static void Main()
    {
        People p = new People();
        p.ToValue("小小",20,"女");
    }
}
public static class Extend
{
    public static void ToValue(this People pp,string name,int age, string sex)
    {
        Console.WriteLine(name+"   "+age+"   "+sex);
    }
}
public class People
{
    public string Name
    {get;set;}
    public int Age
    {get;set;}
    public string Sex
    {get;set;}
}