Iteration Sample : IEnumerator « Data Structure « C# / CSharp Tutorial

1. C# / CSharp Tutorial
2. Data Structure
3. IEnumerator

using System;
using System.Collections;
using System.ComponentModel;
        class IterationSampleIterator : IEnumerator{
            public IterationSample parent;
            public int position;

            internal IterationSampleIterator(IterationSample parent){
                this.parent = parent;
                position = -1;
            }
            public bool MoveNext(){
                if (position != parent.values.Length){
                    position++;
                }
                return position < parent.values.Length;
            }
            public object Current{
                get{
                    if (position == -1 || position == parent.values.Length){
                        throw new InvalidOperationException();
                    }
                    int index = (position + parent.startingPoint);
                    index = index % parent.values.Length;
                    return parent.values[index];
                }
            }
            public void Reset(){
                position = -1;
            }
        }
        class IterationSample : IEnumerable{
            public object[] values;
            public int startingPoint;
    
            public IterationSample(object[] values, int startingPoint){
                this.values = values;
                this.startingPoint = startingPoint;
            }
    
            public IEnumerator GetEnumerator()
            {
                return new IterationSampleIterator(this);
            }
            public static void Main(){
                object[] values = { "a", "b", "c", "d", "e" };
                IterationSample collection = new IterationSample(values, 3);
                foreach (object x in collection){
                    Console.WriteLine(x);
                }
            }
        }