Reset Método
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Inglés

IEnumerator.Reset (Método) ()

 

Establece el enumerador en su posición inicial (antes del primer elemento de la colección).

Espacio de nombres:   System.Collections
Ensamblado:  mscorlib (en mscorlib.dll)

void Reset()

Exception Condition
InvalidOperationException

The collection was modified after the enumerator was created.

An enumerator remains valid as long as the collection remains unchanged.If changes are made to the collection, such as adding, modifying, or deleting elements, the enumerator is irrecoverably invalidated and the next call to the MoveNext or Reset method throws an InvalidOperationException.

The Reset method is provided for COM interoperability.It does not necessarily need to be implemented; instead, the implementer can simply throw a NotSupportedException.

Notas para los implementadores:

All calls to Reset must result in the same state for the enumerator.The preferred implementation is to move the enumerator to the beginning of the collection, before the first element.This invalidates the enumerator if the collection has been modified since the enumerator was created, which is consistent with MoveNext and Current.

The following code example demonstrates the implementation of the IEnumerator interfaces for a custom collection.In this example, Reset is not explicitly called, but it is implemented to support the use of foreach (for each in Visual Basic).This code example is part of a larger example for the IEnumerator interface.

// 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();
            }
        }
    }
}

Universal Windows Platform
Disponible desde 4.5
.NET Framework
Disponible desde 1.1
Portable Class Library
Compatible con: portable .NET platforms
Silverlight
Disponible desde 2.0
Windows Phone Silverlight
Disponible desde 7.0
Windows Phone
Disponible desde 8.1
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