using System;
using System.Collections;
using System.Collections.Generic;
using System.Linq; using System.Text;
using System.Threading.Tasks;
namespace ConsoleApplication2 {
class Program {
static void Main(string[] args)
{
Person per = new Person();
//如果直接遍历person,会提示person不包含getEnumrator的公共定义,所以foreach语句不能作用于person的变量
//foreach (string item in per)
//{
//}
//当person实心了iEnumreble接口时,其实目的只是为了实现接口中的IEnumerator的方法,此时foreach不在冒红了
foreach (string item in per)
{
Console.WriteLine(item);
}
Console.Read();
}
}
public class Person : IEnumerable
{
public string Name { get; set; }
public int Age { get; set; }
private string[] strArray = new string[] {
"aaa", "bbb", "ccc", "ddd" };
/// <summary> ///
这就是枚举器 /// </summary>
/// <returns></returns>
public IEnumerator GetEnumerator()
{
//返回实现了IEnumerator接口的枚举器
return new PersonEnumrator(strArray);
}
}
/// <summary> ///
自己写一个枚举器,并且实现IEnumerator,然后需要重写IEnumerator中的方法 ///
</summary>
public class PersonEnumrator : IEnumerator
{
//声明数组
string[] strArray;
/// <summary> /// 构造函数,初始化数组 ///
</summary>
/// <param name="arr"></param>
public PersonEnumrator(string[] arr)
{
if (arr != null)
strArray = arr;
}
int index = -1;//下标
/// <summary>
/// 返回数组中下标为index的值 ///
</summary>
public object Current
{
get { return strArray[index]; }
}
/// <summary>
/// index自增一,判断index是否在数组的范围之内
/// </summary>
/// <returns>在范围内,返回TRUE,否则返回FALSE</returns>
public bool MoveNext()
{
index++;
while (index < strArray.Length)
{
return true;
}
return false;
}
/// <summary>
/// 将下标重置 ///
</summary>
public void Reset()
{
index = -1;
} }
}