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The automatic iterator support built into C# 2.0 is very powerful and will be sufficient in the majority of cases. However, in some cases, you may want to take direct control of the implementation of your collection s iterators. For example, you may want an iterator that supports changes to the underlying collection during enumeration. Whatever your reason, the basic model of an enumerable collection is the same as that described in recipe 13-4. Your enumerable type should implement the IEnumerable interface, which requires you to implement a method named GetEnumerator. However, instead of using the yield return statement in GetEnumerator, you must instantiate and return an object that implements the IEnumerator interface. The IEnumerator interface provides a read-only, forward-only cursor for accessing the members of the underlying collection. Table 13-2 describes the members of the IEnumerator interface. The IEnumerator instance returned by GetEnumerator is your custom iterator the object that actually supports enumeration of the collection s data elements. Table 13-2. Members of the IEnumerator Interface

One of the things that makes Groovy different is that a number of things are optional, including parentheses, return statements, and semicolons at the end of statements.

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Property that returns the current data element. When the enumerator is created, Current refers to a position preceding the first data element. This means you must call MoveNext before using Current. If Current is called and the enumerator is positioned before the first element or after the last element in the data collection, Current must throw a System.InvalidOperationException. Method that moves the enumerator to the next data element in the collection. Returns true if there are more elements; otherwise, it returns false. If the underlying source of data changes during the life of the enumerator, MoveNext must throw an InvalidOperationException. Method that moves the enumerator to a position preceding the first element in the data collection. If the underlying source of data changes during the life of the enumerator, Reset must throw an InvalidOperationException.

Note The rules that govern optional parentheses are unambiguous, but it s generally good style to include

If your collection class contains different types of data that you want to enumerate separately, implementing the IEnumerable interface on the collection class is insufficient. In this case, you would implement a number of properties that returned different IEnumerator instances.

s Note Although iPod Safari allows you to browse the Web in full resolution, some web sites detect that

parentheses in all but the simplest of cases (for example, in a println statement).

The TeamMember, Team, and TeamMemberEnumerator classes in the following example demonstrate the implementation of a custom iterator using the IEnumerable and IEnumerator interfaces. The TeamMember class represents a member of a team. The Team class, which represents a team of people, is a collection of TeamMember objects. Team implements the IEnumerable interface and declares a separate class, named TeamMemberEnumerator, to provide enumeration functionality. Team implements the Observer pattern using delegate and event members to notify all TeamMemberEnumerator objects if their underlying Team changes. (See recipe 13-11 for a detailed description of the Observer pattern.) The TeamMemberEnumerator class is a private nested class, so you cannot create instances of it other than through the Team.GetEnumerator method. using System; using System.Collections; namespace Apress.VisualCSharpRecipes.13 { // TeamMember class represents an individual team member. public class TeamMember { public string Name; public string Title; // Simple TeamMember constructor. public TeamMember(string name, string title) { Name = name; Title = title; } // Returns a string representation of the TeamMember. public override string ToString() { return string.Format("{0} ({1})", Name, Title); } } // Team class represents a collection of TeamMember objects. Implements // the IEnumerable interface to support enumerating TeamMember objects. public class Team : IEnumerable { // TeamMemberEnumerator is a private nested class that provides // the functionality to enumerate the TeamMembers contained in // a Team collection. As a nested class, TeamMemberEnumerator // has access to the private members of the Team class. private class TeamMemberEnumerator : IEnumerator { // The Team that this object is enumerating. private Team sourceTeam; // Boolean to indicate whether underlying Team has changed // and so is invalid for further enumeration. private bool teamInvalid = false;

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