What is the usage of nested classes in C#?

Question

Give Examples about the subject.

Joe Wilson · Answer

Hi, Thank you for your suggestions.

Munesh Sharma · Answer

http://www.codeproject.com/Articles/20628/A-Tutorial-on-Nested-Classes-in-C http://www.dotnetperls.com/nested-class

Joe Wilson · Answer

Thank you very much for your answer.

Vulpes · Answer

The most usual reasons for creating your own nested classes are if: 1. The nested class is only of use to its containing class; or 2. The nested class needs access to the private members of the containing class. They are also often generated in the background by the C# compiler to represent iterators, anonymous methods and lambda expressions. Here's a simple example: using System; class Person { static int nextId = 1; int id; public int Id { get{ return id; } } public string Name { get; set; } public Person(string name) { Name = name; id = nextId; nextId++; } public class Counter // nested class { public int Count { get { return nextId - 1; } // can access Person's private static member, nextId } } } class Program { static void Main() { Person p1 = new Person("Joe"); Person p2 = new Person("Abrar"); Person p3 = new Person("Vulpes"); Person.Counter pc = new Person.Counter(); Console.WriteLine("{0} Person objects have been created", pc.Count); Console.ReadKey(); } } The output is: 3 Person objects have been created

Joe Wilson · Answer

Thank you for your answer,But they don't contain any example.

Khan Abrar Ahmed · Answer

Hi refer this, http://msdn.microsoft.com/en-us/library/s9f3ty7f%28v=vs.71%29.aspx http://stackoverflow.com/questions/5402924/when-do-we-use-a-nested-class-in-c-sharp

What is the usage of nested classes in C#?

Answers (6)