该实例基于WPF实现，直接上代码，下面为三层架构的代码。

目录

一 Model

二 View

三 ViewModel

---

一 Model

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace 设计模式练习.Model.迭代器模式
{//4,具体迭代器类public class ConcreteIterator : Iterator{//迭代器需要对集合对象就行遍历，这里需要引用集合对象private ConcreteList _list;private int _index;public ConcreteIterator(ConcreteList list){_list = list;_index = 0;}public object GetCurrent(){return _list.GetElement(_index);}public bool MoveNext(){if (_index < _list.Length){return true;}return false;}public void Next(){if (_index < _list.Length){_index++;}}public void Reset(){_index = 0;}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace 设计模式练习.Model.迭代器模式
{//3,具体聚合类public class ConcreteList : IListCollection{object[] collections = null;public ConcreteList(object[] colls){collections = colls;}public Iterator GetIterator(){return new ConcreteIterator(this);}public int Length{get { return collections.Length; }}public object GetElement(int index){return collections[index];}}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace 设计模式练习.Model.迭代器模式
{//1,定义抽象聚合类public interface IListCollection{Iterator GetIterator();}
}

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;namespace 设计模式练习.Model.迭代器模式
{//2,定义迭代器抽象类public interface Iterator{bool MoveNext();object GetCurrent();void Next();void Reset();}
}

<Window x:Class="设计模式练习.View.迭代器模式.IteratorWindow"xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"xmlns:d="http://schemas.microsoft.com/expression/blend/2008"xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"xmlns:local="clr-namespace:设计模式练习.View.迭代器模式"mc:Ignorable="d"Title="IteratorWindow" Height="450" Width="800"><Grid><Grid.ColumnDefinitions><ColumnDefinition/><ColumnDefinition/></Grid.ColumnDefinitions><Grid.RowDefinitions><RowDefinition/><RowDefinition/><RowDefinition/><RowDefinition/></Grid.RowDefinitions><TextBlock Text="{Binding Res1}" Grid.Row="0" Grid.Column="0" TextWrapping="Wrap"/><TextBlock Text="{Binding Res2}" Grid.Row="1" Grid.Column="0" TextWrapping="Wrap"/><TextBlock Text="{Binding Res3}" Grid.Row="2" Grid.Column="0" TextWrapping="Wrap"/><TextBlock Text="{Binding Res4}" Grid.Row="3" Grid.Column="0" TextWrapping="Wrap"/><Button Content="遍历集合1" Command="{Binding Col_1Command}" Grid.Row="0" Grid.Column="1"/><Button Content="遍历集合2" Command="{Binding Col_2Command}" Grid.Row="1" Grid.Column="1"/><Button Content="遍历集合3" Command="{Binding Col_3Command}" Grid.Row="2" Grid.Column="1"/><Button Content="遍历集合4" Command="{Binding Col_4Command}" Grid.Row="3" Grid.Column="1"/></Grid>
</Window>

三 ViewModel

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using 设计模式练习.Model.迭代器模式;namespace 设计模式练习.ViewModel.迭代器模式
{partial class IteratorWindow_ViewModel : ObservableObject{[ObservableProperty]private string res1;[ObservableProperty]private string res2;[ObservableProperty]private string res3;[ObservableProperty]private string res4;[RelayCommand]private void Col_1(){object[] ints = { 1, 2, 3, 4, 5, 66, 77, 91, 453 };Iterator iterator;IListCollection list = new ConcreteList(ints);iterator = list.GetIterator();StringBuilder sb = new StringBuilder();while (iterator.MoveNext()){string str = iterator.GetCurrent().ToString();sb.Append(str + ",");//目标指向下一个iterator.Next();}Res1 = sb.ToString();}[RelayCommand]private void Col_2(){object[] ints = { "李俊", "谢军", "小露露", "", "菲利普" };Iterator iterator;IListCollection list = new ConcreteList(ints);iterator = list.GetIterator();StringBuilder sb = new StringBuilder();while (iterator.MoveNext()){string str = iterator.GetCurrent().ToString();sb.Append(str + ",");iterator.Next();}Res2 = sb.ToString();}[RelayCommand]private void Col_3(){object[] ints = { 12.44, 13.567, 33.789 };Iterator iterator;IListCollection list = new ConcreteList(ints);iterator = list.GetIterator();StringBuilder sb = new StringBuilder();while (iterator.MoveNext()){string str = iterator.GetCurrent().ToString();sb.Append(str + ",");iterator.Next();}Res3 = sb.ToString();}[RelayCommand]private void Col_4(){object[] ints = { Res1, Res2, Res3 };Iterator iterator;IListCollection list = new ConcreteList(ints);iterator = list.GetIterator();StringBuilder sb = new StringBuilder();while (iterator.MoveNext()){string str = iterator.GetCurrent().ToString();sb.Append(str + ",");iterator.Next();}Res4 = sb.ToString();}}
}