实现类对象的枚举遍历
代码
/*-------------实现类对象的枚举遍历
如果希望枚举一个可枚举对象(实现IEnumerable接口)的元素,就可以通过IEnumerable接口的GetEnumerator()
* 方法从可枚举对象请求一个枚举器,接下来可以用枚举器的IEnumerator.MoveNext(),Reset,Current方法遍历。
* public interface IEnumerable
* {
* IEnumerator GetEnumerator();
* }
* public interface IEnumerator
* {
* object Current{get;}
* bool MoveNext();
* void Reset();
* }
*/
using System;
using System.Collections;
public class Person
{
public Person(string fName, string lName)
{
this.firstName = fName;
this.lastName = lName;
}
public string firstName;
public string lastName;
}
public class People : IEnumerable
{
private Person[] _people;
public People(Person[] pArray)
{
_people = new Person[pArray.Length];
for (int i = 0; i < pArray.Length; i++)
{
_people[i] = pArray[i];
}
}
public IEnumerator GetEnumerator()
{
return new PeopleEnum(_people);
}
}
public class PeopleEnum : IEnumerator
{
public Person[] _people;
int position = -1;
public PeopleEnum(Person[] list)
{
_people = list;
}
public bool MoveNext()
{
position++;
return (position < _people.Length);
}
public void Reset()
{
position = -1;
}
public object Current
{
get
{
try
{
return _people[position];
}
catch (IndexOutOfRangeException)
{
throw new InvalidOperationException();
}
}
}
}
调用:
public static void ForeachDisplay()
{
Person[] peopleArray = new Person[3]
{
new Person("John", "Smith"),
new Person("Jim", "Johnson"),
new Person("Sue", "Rabon"),
};
People peopleList = new People(peopleArray);
foreach (Person p in peopleList)
Console.WriteLine(p.firstName + " " + p.lastName);
}
如果希望枚举一个可枚举对象(实现IEnumerable接口)的元素,就可以通过IEnumerable接口的GetEnumerator()
* 方法从可枚举对象请求一个枚举器,接下来可以用枚举器的IEnumerator.MoveNext(),Reset,Current方法遍历。
* public interface IEnumerable
* {
* IEnumerator GetEnumerator();
* }
* public interface IEnumerator
* {
* object Current{get;}
* bool MoveNext();
* void Reset();
* }
*/
using System;
using System.Collections;
public class Person
{
public Person(string fName, string lName)
{
this.firstName = fName;
this.lastName = lName;
}
public string firstName;
public string lastName;
}
public class People : IEnumerable
{
private Person[] _people;
public People(Person[] pArray)
{
_people = new Person[pArray.Length];
for (int i = 0; i < pArray.Length; i++)
{
_people[i] = pArray[i];
}
}
public IEnumerator GetEnumerator()
{
return new PeopleEnum(_people);
}
}
public class PeopleEnum : IEnumerator
{
public Person[] _people;
int position = -1;
public PeopleEnum(Person[] list)
{
_people = list;
}
public bool MoveNext()
{
position++;
return (position < _people.Length);
}
public void Reset()
{
position = -1;
}
public object Current
{
get
{
try
{
return _people[position];
}
catch (IndexOutOfRangeException)
{
throw new InvalidOperationException();
}
}
}
}
调用:
public static void ForeachDisplay()
{
Person[] peopleArray = new Person[3]
{
new Person("John", "Smith"),
new Person("Jim", "Johnson"),
new Person("Sue", "Rabon"),
};
People peopleList = new People(peopleArray);
foreach (Person p in peopleList)
Console.WriteLine(p.firstName + " " + p.lastName);
}
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