class BookEnum : IEnumerator //实现foreach语句内部,并派生
{
public Book[] _book; //实现数组
int position = -;//设置“指针”
public BookEnum(Book[] list)
{
_book = list; //实现list
}
public bool MoveNext()//实现向前移动
{
position++; //位置增加
return (position < _book.Length); //返回布尔值
}
public void Reset() //位置重置
{
position = -;
}//重置指针为-1
public object Current //实现接口方法
{
get
{
try
{
return _book[position]; //返回对象
}
catch (IndexOutOfRangeException) //捕获异常
{
throw new InvalidOperationException(); //抛出异常信息
}
}
}
}
public class Book : IEnumerable
{
public string Name;
public string Price;
public Book(string name, string price)
{
Name = name;
Price = price;
}
private Book[] book;
public Book(Book[] array) //
{
book = array;
}
public IEnumerator GetEnumerator() //实现接口
{
return new BookEnum(book); //返回方法
}
}
public partial class MainWindow : Window
{
public Student stu;
public MainWindow()
{
InitializeComponent();
Book[] book = new Book[]
{
new Book("水浒",""),
new Book("三国",""),
new Book("西游","")
};
foreach (Book p in book)
{
this.textBox2.Text+="书的名字：" + p.Name + "；价格： " + p.Price;
}
}
