Design mode (---) iterator mode

Defined:

The iterator pattern provides a way to sequentially access individual elements in an aggregated object without exposing the object's internal representation.

Because of the extensive use of iterator patterns, now high-level languages such as C#,java have already encapsulated this pattern in language. For example, in C #, foreach in.

So this is not a detailed introduction to the iterator pattern here, the following is a brief description of some of the basic knowledge that is seen in the book:

Ieumerator supports simple iterative interfaces to non-generic collections.

 Public Interface Ieumerator    {        objectget;}         BOOL MoveNext ();         void Reset ();    }

IEnumerable exposes an enumerator that supports simple iterations on a non-generic collection.

 Public Interface IEnumerable    {        ieumerator GetEnumerator ();    }

Simple example:

ilist<string> strlist =Newlist<string>(); Strlist.add ("a"); Strlist.add ("C"); Strlist. ADD ("D"); foreach(stringIteminchstrlist) {Console.WriteLine ("{0}", item); }

Design mode (---) iterator mode