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

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C# / CSharp Tutorial » Data Structure » IEnumerator 
11.44.9.Iteration Sample
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 == -|| 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);
                }
            }
        }
11.44.IEnumerator
11.44.1.A simple example of an iterator.
11.44.2.Iterated values can be dynamically constructed.
11.44.3.Use named iterators
11.44.4.Use the Enumerable pattern
11.44.5.Implement IEnumerable and IEnumerator
11.44.6.Define custom enumerators and use foreach to loop through
11.44.7.Build your own IEnumerator/IEnumerable and use it in foreach loop
11.44.8.Circular Iterator
11.44.9.Iteration Sample
11.44.10.Iterator Workflow
11.44.11.IEnumerator and ArrayList, BitArray, Hashtable and array
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