属性(Property)是类(class)、结构(structure)和接口(interface)的命名(named)成员。类或结构中的成员变量或方法称为 域(Field)。属性(Property)是域(Field)的扩展,且可使用相同的语法来访问。它们使用 访问器(accessors) 让私有域的值可被读写或操作。
该代码主要是帮助读者了解属性的用法,代码实现了添加属性值和根据添加的属性值进行筛选
using System;
using System.Collections;
using System.Collections.Generic;
using System.Globalization;
using System.Linq;
using System.Text;
namespace 编码练习
{
//创建一个类包含两个属性
class People
{
public string Name { get; set; }
public string Address { get; set; }
public People(string name, string address)
{
this.Name = name;
this.Address = address;
}
}
//继承两个接口(枚举/格式化)
class Peoples : IEnumerable
{
//创建一个对象列表
private List<People> Lpeoples { get; set; }
private StringBuilder Sbuilder { get; set; }
public Peoples()
{
Lpeoples = new List<People>();
}
//创建一个可以往列表加属性实例的方法
public void Add(People people)
{
Lpeoples.Add(people);
}
//获取对象值
public IEnumerator GetEnumerator()
{
foreach (var p in Lpeoples)
{
yield return p;
}
}
public override string ToString()
{
return GetContent(Lpeoples);
}
public string Tostring(string format)
{
return ToString(format, CultureInfo.CreateSpecificCulture("zh-CN"));
}
public string ToString(string format, IFormatProvider formatProvider)
{
IEnumerable<People> ps = Lpeoples;
if (format.ToUpperInvariant() == "B")
{
ps = from p in Lpeoples where p.Address == "北京" select p;
}
else if (format.ToUpperInvariant() == "S")
{
ps = from p in Lpeoples where p.Address == "上海" select p;
}
return GetContent(ps);
}
//将数据连接到数组
private string GetContent(IEnumerable<People> peoples)
{
Sbuilder = new StringBuilder();
foreach (var p in peoples)
{
Sbuilder.AppendLine(string.Format("{0}{1}", p.Name, p.Address));
}
return Sbuilder.ToString();
}
}
public class Start
{
public static void Main()
{
Peoples peoples = new Peoples()
{new People("zhangsan","北京"),new People("lisi","上海"),new People("wangwu","北京"),new People("naliu","北京")};
Console.WriteLine("本站会员有:");
Console.WriteLine(peoples.ToString());
Console.WriteLine("北京的会员有:");
Console.WriteLine(peoples.Tostring("B"));
Console.WriteLine("上海的会员有:");
Console.WriteLine(peoples.Tostring("S"));
Console.ReadLine();
}
}
}
知识兔附加知识:
IFormatProvider接口的引用,该接口用于格式化操作,当进行数字,日期时间,字符串匹配时,都会进行CultureInfo的操作,文中CultureInfo.CreateSpecificCulture("zh-CN")意为结果输出的是<简体,中国>