Iterator patten example

Author: anupavanm

DesignPatterns.sln

@@ -31,6 +31,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "ChainOfResponsibilityPatter
 EndProject
 Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "CommandPattern", "CommandPattern\CommandPattern.csproj", "{25E92DA1-1205-4D53-85F4-B77BC92DCF5A}"
 EndProject
+Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "IteratorPattern", "IteratorPattern\IteratorPattern.csproj", "{BB1AE146-315A-44F8-A90B-77E386C65678}"
+EndProject
 Global
 	GlobalSection(SolutionConfigurationPlatforms) = preSolution
 		Debug|Any CPU = Debug|Any CPU
@@ -93,6 +95,10 @@ Global
 		{25E92DA1-1205-4D53-85F4-B77BC92DCF5A}.Debug|Any CPU.Build.0 = Debug|Any CPU
 		{25E92DA1-1205-4D53-85F4-B77BC92DCF5A}.Release|Any CPU.ActiveCfg = Release|Any CPU
 		{25E92DA1-1205-4D53-85F4-B77BC92DCF5A}.Release|Any CPU.Build.0 = Release|Any CPU
+		{BB1AE146-315A-44F8-A90B-77E386C65678}.Debug|Any CPU.ActiveCfg = Debug|Any CPU
+		{BB1AE146-315A-44F8-A90B-77E386C65678}.Debug|Any CPU.Build.0 = Debug|Any CPU
+		{BB1AE146-315A-44F8-A90B-77E386C65678}.Release|Any CPU.ActiveCfg = Release|Any CPU
+		{BB1AE146-315A-44F8-A90B-77E386C65678}.Release|Any CPU.Build.0 = Release|Any CPU
 	EndGlobalSection
 	GlobalSection(SolutionProperties) = preSolution
 		HideSolutionNode = FALSE

IteratorPattern/IteratorPattern.csproj

@@ -0,0 +1,8 @@
+<Project Sdk="Microsoft.NET.Sdk">
+
+  <PropertyGroup>
+    <OutputType>Exe</OutputType>
+    <TargetFramework>netcoreapp2.0</TargetFramework>
+  </PropertyGroup>
+
+</Project>

IteratorPattern/Program.cs

@@ -0,0 +1,107 @@
+using System;
+using System.Collections;
+using System.Collections.Generic;
+using System.Linq;
+
+namespace IteratorPattern
+{
+class RadioStation
+{
+  private float mFrequency;
+
+  public RadioStation(float frequency)
+  {
+    mFrequency = frequency;
+  }
+
+  public float GetFrequecy()
+  {
+    return mFrequency;
+  }
+
+}
+
+class StationList : IEnumerable
+{
+  private List<RadioStation> mStations;
+
+  public StationList()
+  {
+    mStations = new List<RadioStation>();
+  }
+
+  public void AddStation(RadioStation station)
+  {
+    mStations.Add(station);
+  }
+
+  public void RemoveStation(RadioStation station)
+  {
+    mStations.Remove(station);
+  }
+
+  public IEnumerator GetEnumerator()
+  {
+    return new StationIterator(mStations);
+  }
+}
+
+class StationIterator : IEnumerator
+{
+  private List<RadioStation> mStations;
+  private int currentPosition = -1;
+
+  public object Current
+  {
+    get
+    {
+      return mStations[currentPosition];
+    }
+  }
+
+  public StationIterator(List<RadioStation> stations)
+  {
+    mStations = stations;
+  }
+  public bool MoveNext()
+  {
+    if(currentPosition < mStations.Count - 1)
+    {
+      currentPosition = currentPosition + 1;
+      return true;
+    }
+
+    return false;
+  }
+
+  public void Reset()
+  {
+    currentPosition = -1;
+  }
+}
+
+class Program
+{
+  static void Main(string[] args)
+  {
+    var stations = new StationList();
+    var station1 = new RadioStation(89);
+    stations.AddStation(station1);
+
+    var station2 = new RadioStation(101);
+    stations.AddStation(station2);
+
+    var station3 = new RadioStation(102);
+    stations.AddStation(station3);
+
+    foreach(RadioStation station in stations)
+    {
+      Console.WriteLine(station.GetFrequecy());
+    }
+
+    stations.RemoveStation(station2); // Will Remove station 101
+
+    Console.ReadLine();
+  }
+}
+}