Essential C# IEnumerable  Suggest an edit

IEnumerable with custom Enumerator

Implementing the IEnumerable interface allows classes to be enumerated in the same way as BCL collections. This requires extending the Enumerator class which tracks the state of the enumeration.

Other than iterating over a standard collection, examples include:

public static void Main(string[] args) {

    foreach (var coffee in new CoffeeCollection()) {
        Console.WriteLine(coffee);
    }
}

public class CoffeeCollection : IEnumerable {
    private CoffeeEnumerator enumerator;

    public CoffeeCollection() {
        enumerator = new CoffeeEnumerator();
    }

    public IEnumerator GetEnumerator() {
        return enumerator;
    }

    public class CoffeeEnumerator : IEnumerator {
        string[] beverages = new string[3] { "espresso", "macchiato", "latte" };
        int currentIndex = -1;

        public object Current {
            get {
                return beverages[currentIndex];
            }
        }

        public bool MoveNext() {
            currentIndex++;

            if (currentIndex < beverages.Length) {
                return true;
            }

            return false;
        }

        public void Reset() {
            currentIndex = 0;
        }
    }
}

IEnumerable/
IEnumerable
IEnumerable with custom Enumerator
IEnumerable int

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22 Enum
25 GUID
30 IEnumerable
107 Stream
108 Timers
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