C# 0 The Complete Reference

PART II

C h a p t e r   2 4 :  

C o l l e c t i o n s ,   E n u m e r a t o r s ,   a n d   I t e r a t o r s    

819

The

GetEnumerator( )

 method operates on data of type 

T

 and returns an 

IEnumerator

enumerator. Thus, the iterator defined by 

MyClass

 can enumerate any type of data.

Collection Initializers

C# 3.0 includes a new feature called the 

collection initializer,

 which makes it easier to initialize 

certain collections. Instead of having to explicitly call 

Add( )

, you can specify a list of 

initializers when a collection is created. When this is done, the compiler automatically calls 

Add( )

 for you, using these values. The syntax is similar to an array initialization. Here is an 

example. It creates a 

List

 that is initialized by the characters C, A, E, B, D, and F.

List lst = new List() { 'C', 'A', 'E', 'B', 'D', 'F' };

After this statement executes, 

lst.Count

 will equal 6, because there are six initializers, and 

this

foreach

 loop

foreach(ch in lst)

  Console.Write(ch + " ");

will display

C A E B D F

When using a collection such as