C#IEnumerator.MoveNext 方法 ()

将枚举数推进到集合的下一个元素。

命名空间:   System.Collections
程序集:  mscorlib（mscorlib.dll 中）

 

语法：

bool MoveNext()

返回值

Type: System.Boolean

如果枚举数已成功地推进到下一个元素，则为 true；如果枚举数传递到集合的末尾，则为 false。

 

// When you implement IEnumerable, you must also implement IEnumerator.
public class PeopleEnum : IEnumerator
{
    public Person[] _people;

    // Enumerators are positioned before the first element
    // until the first MoveNext() call.
    int position = -1;

    public PeopleEnum(Person[] list)
    {
        _people = list;
    }

    public bool MoveNext()
    {
        position++;
        return (position < _people.Length);
    }

    public void Reset()
    {
        position = -1;
    }

    object IEnumerator.Current
    {
        get
        {
            return Current;
        }
    }

    public Person Current
    {
        get
        {
            try
            {
                return _people[position];
            }
            catch (IndexOutOfRangeException)
            {
                throw new InvalidOperationException();
            }
        }
    }
}