迭代器模式

DesignPattern.sln

@@ -27,6 +27,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "StrategyPattern", "Strategy
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "AdapterPattern", "AdapterPattern\AdapterPattern.csproj", "{A0D5F127-471C-47AC-A9E0-F2BB72D2EF8F}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "IteratorPattern", "IteratorPattern\IteratorPattern.csproj", "{04898517-CD60-419B-9C4D-2BE8A99C40FC}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -81,6 +83,10 @@ Global
 		{A0D5F127-471C-47AC-A9E0-F2BB72D2EF8F}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{A0D5F127-471C-47AC-A9E0-F2BB72D2EF8F}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{A0D5F127-471C-47AC-A9E0-F2BB72D2EF8F}.Release|Any CPU.Build.0 = Release|Any CPU
+		{04898517-CD60-419B-9C4D-2BE8A99C40FC}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{04898517-CD60-419B-9C4D-2BE8A99C40FC}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{04898517-CD60-419B-9C4D-2BE8A99C40FC}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{04898517-CD60-419B-9C4D-2BE8A99C40FC}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

IteratorPattern/App.config

@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.1" />
+    </startup>
+</configuration>

IteratorPattern/Iterator.cs

@@ -0,0 +1,91 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace IteratorPattern
+{
+    // 抽象聚合类
+    public interface IListCollection
+    {
+        Iterator GetIterator();
+    }
+
+    // 迭代器抽象类
+    public interface Iterator
+    {
+        bool MoveNext();
+        Object GetCurrent();
+        void Next();
+        void Reset();
+    }
+
+    // 具体聚合类
+    public class ConcreteList : IListCollection
+    {
+        readonly string[] _collection;
+        public ConcreteList()
+        {
+            _collection = new string[] { "A", "B", "C", "D" };
+        }
+
+        public Iterator GetIterator()
+        {
+            return new ConcreteIterator(this);
+        }
+
+        public int Length
+        {
+            get { return _collection.Length; }
+        }
+
+        public string GetElement(int index)
+        {
+            return _collection[index];
+        }
+    }
+
+    // 具体迭代器类
+    public class ConcreteIterator : Iterator
+    {
+        // 迭代器要集合对象进行遍历操作，自然就需要引用集合对象
+        private ConcreteList _list;
+        private int _index;
+
+        public ConcreteIterator(ConcreteList list)
+        {
+            _list = list;
+            _index = 0;
+        }
+
+        public bool MoveNext()
+        {
+            if (_index < _list.Length)
+            {
+                return true;
+            }
+            return false;
+        }
+
+        public Object GetCurrent()
+        {
+            return _list.GetElement(_index);
+        }
+
+        public void Reset()
+        {
+            _index = 0;
+        }
+
+        public void Next()
+        {
+            if (_index < _list.Length)
+            {
+                _index++;
+            }
+
+        }
+    }
+    
+}

IteratorPattern/IteratorPattern.csproj

@@ -0,0 +1,61 @@
+<?xml version="1.0" encoding="utf-8"?>
+<Project ToolsVersion="14.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
+  <Import Project="$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props" Condition="Exists('$(MSBuildExtensionsPath)\$(MSBuildToolsVersion)\Microsoft.Common.props')" />
+  <PropertyGroup>
+    <Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
+    <Platform Condition=" '$(Platform)' == '' ">AnyCPU</Platform>
+    <ProjectGuid>{04898517-CD60-419B-9C4D-2BE8A99C40FC}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>IteratorPattern</RootNamespace>
+    <AssemblyName>IteratorPattern</AssemblyName>
+    <TargetFrameworkVersion>v4.5.1</TargetFrameworkVersion>
+    <FileAlignment>512</FileAlignment>
+    <AutoGenerateBindingRedirects>true</AutoGenerateBindingRedirects>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugSymbols>true</DebugSymbols>
+    <DebugType>full</DebugType>
+    <Optimize>false</Optimize>
+    <OutputPath>bin\Debug\</OutputPath>
+    <DefineConstants>DEBUG;TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|AnyCPU' ">
+    <PlatformTarget>AnyCPU</PlatformTarget>
+    <DebugType>pdbonly</DebugType>
+    <Optimize>true</Optimize>
+    <OutputPath>bin\Release\</OutputPath>
+    <DefineConstants>TRACE</DefineConstants>
+    <ErrorReport>prompt</ErrorReport>
+    <WarningLevel>4</WarningLevel>
+  </PropertyGroup>
+  <ItemGroup>
+    <Reference Include="System" />
+    <Reference Include="System.Core" />
+    <Reference Include="System.Xml.Linq" />
+    <Reference Include="System.Data.DataSetExtensions" />
+    <Reference Include="Microsoft.CSharp" />
+    <Reference Include="System.Data" />
+    <Reference Include="System.Net.Http" />
+    <Reference Include="System.Xml" />
+  </ItemGroup>
+  <ItemGroup>
+    <Compile Include="Iterator.cs" />
+    <Compile Include="Program.cs" />
+    <Compile Include="Properties\AssemblyInfo.cs" />
+  </ItemGroup>
+  <ItemGroup>
+    <None Include="App.config" />
+  </ItemGroup>
+  <Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
+  <!-- To modify your build process, add your task inside one of the targets below and uncomment it. 
+       Other similar extension points exist, see Microsoft.Common.targets.
+  <Target Name="BeforeBuild">
+  </Target>
+  <Target Name="AfterBuild">
+  </Target>
+  -->
+</Project>

IteratorPattern/Program.cs

@@ -0,0 +1,27 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace IteratorPattern
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Console.WriteLine("迭代器模式：");
+            IListCollection list = new ConcreteList();
+            var iterator = list.GetIterator();
+
+            while (iterator.MoveNext())
+            {
+                int i = (int)iterator.GetCurrent();
+                Console.WriteLine(i.ToString());
+                iterator.Next();
+            }
+
+            Console.Read();
+        }
+    }
+}

IteratorPattern/Properties/AssemblyInfo.cs

@@ -0,0 +1,36 @@
+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// 有关程序集的一般信息由以下
+// 控制。更改这些特性值可修改
+// 与程序集关联的信息。
+[assembly: AssemblyTitle("IteratorPattern")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("IteratorPattern")]
+[assembly: AssemblyCopyright("Copyright ©  2017")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+//将 ComVisible 设置为 false 将使此程序集中的类型
+//对 COM 组件不可见。  如果需要从 COM 访问此程序集中的类型，
+//请将此类型的 ComVisible 特性设置为 true。
+[assembly: ComVisible(false)]
+
+// 如果此项目向 COM 公开，则下列 GUID 用于类型库的 ID
+[assembly: Guid("04898517-cd60-419b-9c4d-2be8a99c40fc")]
+
+// 程序集的版本信息由下列四个值组成: 
+//
+//      主版本
+//      次版本
+//      生成号
+//      修订号
+//
+//可以指定所有这些值，也可以使用“生成号”和“修订号”的默认值，
+// 方法是按如下所示使用“*”: :
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]