What is the need for Iterator Pattern in C#?

Iterator pattern is used to iterate over a set of elements irrespective of their internal representation. The elements will be iterated in sequential order.

public interface sampleIterator {
object firstElement();
object nextElement();
bool isIterationDone();
object currentElement();
}
Purpose of each of the methods in the above interface is shown below:

• firstElement() – Returns the first element of the iterator
• nextElement() – Returns the next element in the iterator
• currentElement() – Returns the current element from the iterator
• isIterationDone() – Returns true if the iteration is done, returns false otherwise

Usage of iterator pattern has few consequences. They are listed below:

• The methods firstElement, nextElement and currentElement will be returning Object rather than more specific type. You have to explicitly cast the resultant Object to the corresponding type.
• Sometimes you might be iterating through a set of elements that are getting changed. This might give incorrect data result.
• Ensure that iterator has privileged access to iterate over the collection of elements.

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