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Inside GetEnumerator( ), five yield statements occur The important thing to understand is that they are executed one at a time, in order, each time another element in the collection is obtained Thus, each time through the foreach loop in Main( ), one character is returned
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Creating a Named Iterator
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Although the preceding examples have shown the easiest way to implement an iterator, there is an alternative: the named iterator In this approach, you create a method, operator, or accessor that returns a reference to an IEnumerable object Your code will use this object to supply the iterator A named iterator is a method with the following general form: public IEnumerable itr-name(param-list) { // yield return obj; }
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25:
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Collections, Enumerators, and Iterators
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Here, itr-name is the name of the method, param-list specifies zero or more parameters that will be passed to the iterator method, and obj is the next object returned by the iterator Once you have created a named iterator, you can use it anywhere that an iterator is needed For example, you can use the named iterator to control a foreach loop Named iterators are very useful in some circumstances because they allow you to pass arguments to the iterator that control what elements are obtained For example, you might pass the iterator the beginning and ending points of a range of elements to iterate This form of iterator can also be overloaded, further adding to its flexibility The following program illustrates two ways that a named iterator can be used to obtain elements The first enumerates a range of elements given the endpoints The second enumerates the elements beginning at the start of the sequence and ending at the specified stopping point
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// Use named iterators using System; using SystemCollections; class MyClass { char ch = 'A'; // This iterator returns the letters // of the alphabet, beginning at A and // stopping at the specified stopping point public IEnumerable MyItr(int end) { for(int i=0; i < end; i++) yield return (char) (ch + i); } // This iterator returns the specified // range of letters public IEnumerable MyItr(int begin, int end) { for(int i=begin; i < end; i++) yield return (char) (ch + i); } } class ItrDemo4 { static void Main() { MyClass mc = new MyClass(); ConsoleWriteLine("Iterate the first 7 letters:"); foreach(char ch in mcMyItr(7)) ConsoleWrite(ch + " "); ConsoleWriteLine("\n");
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PART II
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ConsoleWriteLine("Iterate letters from F to L:"); foreach(char ch in mcMyItr(5, 12)) ConsoleWrite(ch + " "); ConsoleWriteLine(); } }
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Part II:
Exploring the C# Library
The output is shown here:
Iterate the first 7 letters: A B C D E F G Iterate letters from F to L: F G H I J K L
Creating a Generic Iterator
The preceding examples of iterators have been non-generic, but it is, of course, also possible to create generic iterators Doing so is quite easy: Simply return an object of the generic IEnumerator<T> or IEnumerable<T> type Here is an example that creates a generic iterator:
// A simple example of a generic iterator using System; using SystemCollectionsGeneric; class MyClass<T> { T[] array; public MyClass(T[] a) { array = a; } // This iterator returns the characters // in the chrs array public IEnumerator<T> GetEnumerator() { foreach(T obj in array) yield return obj; } } class GenericItrDemo { static void Main() { int[] nums = { 4, 3, 6, 4, 7, 9 }; MyClass<int> mc = new MyClass<int>(nums); foreach(int x in mc) ConsoleWrite(x + " "); ConsoleWriteLine();
bool[] bVals = { true, true, false, true }; MyClass<bool> mc2 = new MyClass<bool>(bVals); foreach(bool b in mc2) ConsoleWrite(b + " "); ConsoleWriteLine(); } }
25:
Collections, Enumerators, and Iterators
The output is shown here:
4 3 6 4 7 9 True True False True
In this example, the array containing the objects to be iterated is passed to MyClass through its constructor The type of the array is specified as a type argument to MyClass The GetEnumerator( ) method operates on data of type T and returns an IEnumerator<T> enumerator Thus, the iterator defined by MyClass can enumerate any type of data
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