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The two iterator blocks that I have demonstrated so far have generated their values through calculation. Often, however, you will want to provide iteration over the contents of one of your fields. Listing 9-57 provides a demonstration. Listing 9-57. Exposing a Field to Iteration using System; using System.Collections.Generic; class Counter { private int[] arrData = {2, 4, 6, 8, 10}; public IEnumerator<int> GetEnumerator() { foreach (int i in arrData) { yield return i; } } } class Listing 57 { static void Main(string[] args) { // create a new instance of Counter Counter count = new Counter();

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// enumerate the contents of the counter foreach (int i in count) { Console.WriteLine("Value: {0}", i); } // wait for input before exiting Console.WriteLine("Press enter to finish"); Console.ReadLine(); } } In this example, the Counter class has a private field that is an array of int values. The iterator block uses a foreach loop to enumerate the contents of the loop and the yield return statement to return each value. Compiling and running the code in Listing 9-57 produces the following results: Value: 2 Value: 4 Value: 6 Value: 8 Value: 10 Press enter to finish If the field you want to expose through an iterator block is a collection or an array, as was the case in the previous example, then there is an alternative approach. Collection classes (described in a later part of this book) and arrays (described in 13) implement their own iterator blocks, which means that we can simply return the result of their implementation of the GetEnumerator method. There is a small wrinkle when using arrays in this way, in that in order to get a strongly typed IEnumerator<T>, we have to cast the array to an IList<T>, as follows: using System.Collections.Generic; class Counter { private int[] arrData = {2, 4, 6, 8, 10}; public IEnumerator<int> GetEnumerator() { return ((IList<int>)arrData).GetEnumerator(); } }

An iterator block can contain more than one yield return statements, which means that you need not generate all your values in a single loop or as a result of a single calculation. Listing 9-58 contains a simple demonstration. Listing 9-58. Using Multiple yield return Statements in an Iterator Block using System.Collections.Generic;

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