Reset Method

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Sets the enumerator to its initial position, which is before the first element in the collection.

Namespace:  System.Collections
Assembly:  mscorlib (in mscorlib.dll)


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.

Notes to Implementers

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.