mscorlib 2.0.0.0 4.0.0.0 Covariant System.Collections.IEnumerable To be added.

Many interfaces and classes in the namespace inherit the interface to implement enumerators. For an example, see the interface.

For a sample that demonstrates implementing the interface, see Generics Sample.

Exposes the enumerator, which supports a simple iteration over a collection of a specified type.

- Method
  2.0.0.0
  4.0.0.0
  System.Collections.Generic.IEnumerator<T>

  The foreach statement of the C# language (for each in C++, For Each in Visual Basic) hides the complexity of the enumerators. Therefore, using foreach is recommended, instead of directly manipulating the enumerator.

  Enumerators can be used to read the data in the collection, but they cannot be used to modify the underlying collection.

  Initially, the enumerator is positioned before the first element in the collection. At this position, is undefined. Therefore, you must call to advance the enumerator to the first element of the collection before reading the value of .

  returns the same object until is called. sets to the next element.

  If passes the end of the collection, the enumerator is positioned after the last element in the collection and returns false. When the enumerator is at this position, subsequent calls to also return false. If the last call to returned false, is undefined. You cannot set to the first element of the collection again; you must create a new enumerator instance instead.

  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 its behavior is undefined.

  The enumerator does not have exclusive access to the collection; therefore, enumerating through a collection is intrinsically not a thread-safe procedure. To guarantee thread safety during enumeration, you can lock the collection during the entire enumeration. To allow the collection to be accessed by multiple threads for reading and writing, you must implement your own synchronization.

  Default implementations of collections in the namespace are not synchronized.

  Returns an enumerator that iterates through the collection.

  A that can be used to iterate through the collection.