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Note

By convention, generic types specify their placeholders using common names. Although any letter (or

word) will do, typically 

T

is used to represent types,

TKey

is used for keys, and 

TValue

is used for values.

The System.Collections.Generic namespace also defines a number of classes that implement

many of these key interfaces. Table 10-5 describes the core class types of this namespace, the inter-

faces they implement, and any corresponding type in the System.Collections namespace.

Table 10-5.

Classes of System.Collections.Generic

Generic Class in 

Nongeneric Counterpart

System.Collections

Meaning in Life

Collection

CollectionBase

The basis for a generic collection

Comparer

Comparer

Compares two generic objects for

equality

Dictionary

Hashtable

A generic collection of

name/value pairs

List

ArrayList

A dynamically resizable list of

items

Queue

Queue

A generic implementation of a

first-in, first-out (FIFO) list

SortedDictionary

SortedList

A generic implementation of a

sorted set of name/value pairs

Stack

Stack

A generic implementation of a

last-in, first-out (LIFO) list

C H A P T E R   1 0  

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