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// Type indexer; see Chapter 12 for full details.

object this[object key] { get; set; }

ICollection Keys { get; }

ICollection Values { get; }

void Add(object key, object value);

void Clear();

bool Contains(object key);

IDictionaryEnumerator GetEnumerator();

void Remove(object key);

}

The Role of IDictionaryEnumerator

If you were paying attention in the previous section, you may have noted that IDictionary.

GetEnumerator() returns an instance of the IDictionaryEnumerator type. IDictionaryEnumerator

is simply a strongly typed enumerator, given that it extends IEnumerator by adding the following

functionality:

public interface IDictionaryEnumerator : IEnumerator

{

DictionaryEntry Entry { get; }

object Key { get; }

object Value { get; }

}

Notice how IDictionaryEnumerator allows you to enumerate over items in the dictionary via

the generalized Entry property, which returns a System.Collections.DictionaryEntry class type.

In addition, you are also able to traverse the name/value pairs using the Key/Value properties.