The document provides an overview of various interfaces in the .NET class library, highlighting generic and non-generic collections such as IEnumerable, ICollection, IList, and IDictionary. Each interface is described with its properties and methods, emphasizing the functionality for iteration, manipulation, and comparison of collections. Key components include the methods for enumerating and modifying elements within these collections.

2.  Introduction
 Types

3.  It makes programs more compact and easier.
 Contains Methods, Indexes, Events and
Properties.
 .NET class library defines 2 different interfaces-
1. Generic Interfaces
2. Non-Generic Interfaces

4.  IEnumerable
 IEnumerable<T>
 IEnumerator
 Ienumerator<T>
 ICollection
 Icollection<T>
 Idictonary
 Ilist
 Ilist<T>
 Icompare
 IEqualityComparer<T>

5. IEnumerable
 Supports simple iteration over non-generic collection
 Method –
GetEnumerator( )
IEnumerable<T>
 supports iteration over generic collection
 T- The type of objects to enumerate.
 Method –
GetEnumerator( )

6. IEnumerator
 Supports iteration over non-generic collection.
 Properties -
Current
 Methods -
MoveNext( )
Reset ( )
IEnumerator<T>
 Supports iteration over generic collection.
 T- type of object to enumerate
 Properties -
Current
 Methods -
MoveNext( )
Reset ( )
Dispose( )

7. ICollection
 Properties -
Count
IsSynchronized
IsReadonly
 Methods -
CopyTo ( )
GetEnumerator ( 0
ICollection<T>
 Defines methods to manipulate generic collections.
 T- type of elements in the collection
 Properties -
Count
IsReadonly
 Methods -
Add ( ) Clear ( )
Contains ( ) Remove ( )

8. IList
 Represents a non-generic collection of objects.
 Falls into categories -
1. Read-Only
2. Fixed Size
3.variable Size
 Properties -
Count
IsFixedSize
IsReadOnly
 Methods -
Add ( ) Clear ( )
Contains ( ) Remove ( )
CopyTO ( ) Insert ( )
IList<T> - Represents a generic collection of objects.

9. IDictonary
 Represents a non-generic collection of key/value pair
 Falls into categories -
1. Read-Only
2. Fixed Size
3.variable Size
 Properties –
Count
IsFixedSize
IsReadOnly
 Methods -
Add ( ) Clear ( )
Contains ( ) Remove ( )
CopyTo

10. IEqualityComparer
 Defines methods to support the comparison of objects for equality.
 Methods -
Equals ( )
GetHashCode ( )
IComparer
 Exposes a method that compares two objects.
 Methods -
Compare ( )

11. Thank you