в 15:31, 26 мая 2010

2010-05-26T15:31:18Z

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2010-05-26T11:38:54Z

1 версия

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==Collection is iterated using the IEnumerator interface==

<source lang="csharp">
using System;
using System.Collections;
public class Starter {
public static void Main() {
SimpleCollection simple = new SimpleCollection(new object[] { 1, 2, 3, 4, 5, 6, 7 });
IEnumerator enumerator = simple.GetEnumerator();
while (enumerator.MoveNext()) {
Console.WriteLine(enumerator.Current);
}
}
}
public class SimpleCollection : IEnumerable {
public SimpleCollection(object[] array) {
items = array;
}
public IEnumerator GetEnumerator() {
return new Enumerator(items);
}
private object[] items = null;
}
public class Enumerator : IEnumerator {
public Enumerator(object[] items) {
elements = new object[items.Length];
Array.Copy(items, elements, items.Length);
cursor = -1;
}
public bool MoveNext() {
++cursor;
if (cursor > (elements.Length - 1)) {
return false;
}
return true;
}
public void Reset() {
cursor = -1;
}
public object Current {
get {
if (cursor > (elements.Length - 1)) {
throw new InvalidOperationException("Enumeration already finished");
}
if (cursor == -1) {
throw new InvalidOperationException(
"Enumeration not started");
}
return elements[cursor];
}
}
private int cursor;
private object[] elements = null;
}
</source>

==IEnumerator Example (Static Collection)==

<source lang="csharp">
using System;
using System.Collections;
public class SimpleCollection : IEnumerable {
public SimpleCollection(object[] array) {
items = array;
}
public IEnumerator GetEnumerator() {
return new Enumerator(this);
}
private class Enumerator : IEnumerator {
public Enumerator(SimpleCollection obj) {
oThis = obj;
cursor = -1;
}
public bool MoveNext() {
++cursor;
if (cursor > (oThis.items.Length - 1)) {
return false;
}
return true;
}

public void Reset() {
cursor = -1;
}
public object Current {
get {
if (cursor > (oThis.items.Length - 1)) {
throw new InvalidOperationException(
"Enumeration already finished");
}
if (cursor == -1) {
throw new InvalidOperationException(
"Enumeration not started");
}
return oThis.items[cursor];
}
}
private int cursor;
private SimpleCollection oThis;
}

private object[] items = null;
}
</source>

==iterates two collections simultaneously==

<source lang="csharp">
using System;
using System.Collections.Generic;
public class Starter {
public static void Main() {
MyClass obj = new MyClass();
foreach (int item in obj) {
Console.Write(item);
}
}
}
public class MyClass {
private int[] list1 = new int[] { 0, 2, 4, 6, 8 };
private int[] list2 = new int[] { 1, 3, 5, 7, 9 };
public IEnumerator<int> GetEnumerator() {
for (int index = 0; index < 4; ++index) {
yield return list1[index];
yield return list2[index];
}
}
}
</source>

==yield IEnumerator==

<source lang="csharp">

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

public class Primes {
private long min;
private long max;
public Primes(long minimum, long maximum) {
min = minimum;
max = maximum;
}
public IEnumerator GetEnumerator() {
for (long possiblePrime = min; possiblePrime <= max; possiblePrime++) {
bool isPrime = true;
for (long possibleFactor = 2; possibleFactor <= (long)Math.Floor(Math.Sqrt(possiblePrime)); possibleFactor++) {
long remainderAfterDivision = possiblePrime % possibleFactor;
if (remainderAfterDivision == 0) {
isPrime = false;
break;
}
}
if (isPrime) {
yield return possiblePrime;
}
}
}
}
class Program {
static void Main(string[] args) {
Primes primesFrom2To1000 = new Primes(2, 1000);
foreach (long i in primesFrom2To1000)
Console.Write("{0} ", i);
}
}
</source>

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в 15:31, 26 мая 2010

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