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The Role of IDictionary

A dictionary is simply a collection that maintains a set of name/value pairs. For example, you could

build a custom type that implements IDictionary such that you can store Car types (the values) that

may be retrieved by ID or pet name (e.g., names). Given this functionality, you can see that the

IDictionary interface defines a Keys and Values property as well as Add(), Remove(), and Contains()

methods. The individual items may be obtained by the type indexer, which is a construct that allows

you to interact with subitems using an arraylike syntax. Here is the formal definition:

public interface IDictionary :

ICollection, IEnumerable

{

bool IsFixedSize { get; }

bool IsReadOnly { get; }