Observer and Events

ConsoleApplicationPacManEvents/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
+    </startup>
+</configuration>

ConsoleApplicationPacManEvents/ClassDiagram1.cd

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+<?xml version="1.0" encoding="utf-8"?>
+<ClassDiagram /> 

ConsoleApplicationPacManEvents/ClassDiagram2.cd

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+<?xml version="1.0" encoding="utf-8"?>
+<ClassDiagram /> 

ConsoleApplicationPacManEvents/ClassDiagramObserver.cd

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+<?xml version="1.0" encoding="utf-8"?>
+<ClassDiagram /> 

ConsoleApplicationPacManEvents/ConsoleApplicationPacManEvents.csproj

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+<?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>{CD02E043-B1B5-47DB-B373-3A507477E848}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>ConsoleApplicationObserver</RootNamespace>
+    <AssemblyName>ConsoleApplicationObserver</AssemblyName>
+    <TargetFrameworkVersion>v4.5.2</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="Ghost.cs" />
+    <Compile Include="Pacman.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>

ConsoleApplicationPacManEvents/Ghost.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace ConsoleApplicationObserver
+{
+    public class Ghost 
+    {
+        Pacman pacSub;
+
+        public Ghost(Pacman pac)
+        {
+            this.pacSub = pac;
+            this.pacSub.StateChanged += PacManUpdate;
+        }
+
+
+        public void PacManUpdate(object sender, PacManEventArgs e)
+        {
+            Console.WriteLine(string.Format("{0} state is {1}", sender, e.State));
+        }
+
+
+        public void Die()
+        {
+            this.pacSub.StateChanged -=PacManUpdate;
+        }
+    }
+}

ConsoleApplicationPacManEvents/Pacman.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace ConsoleApplicationObserver
+{
+    public class Pacman 
+    {
+
+        PacState myState;
+
+        public event EventHandler<PacManEventArgs> StateChanged;
+
+        public PacState MyState
+        {
+            get { return myState; }
+            set
+            {
+                this.myState = value;
+                StateChanged?.Invoke(this, new PacManEventArgs(this.myState));
+            }
+        }
+
+        public Pacman()
+        {
+
+            MyState = PacState.Spawning;
+
+        }
+
+
+
+    }
+
+
+
+    public enum PacState { Spawning, Chomping, SuperChomp, Dying };
+
+    public class PacManEventArgs : EventArgs
+    {
+
+
+        public PacManEventArgs(PacState state)
+        {
+            this.State = state;
+        }
+
+        public PacState State { get; }
+    }
+}

ConsoleApplicationPacManEvents/Program.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace ConsoleApplicationObserver
+{
+    class Program
+    {
+        static void Main(string[] args)
+        {
+            Pacman p = new Pacman();
+            Ghost redGhost = new Ghost(p);
+            Ghost tealGhost = new Ghost(p);
+
+            Console.WriteLine(p.MyState);
+
+            p.MyState = PacState.Chomping;
+
+            tealGhost.Die();
+
+            p.MyState = PacState.Dying;
+
+            Console.ReadKey();
+        }
+    }
+}

ConsoleApplicationPacManEvents/Properties/AssemblyInfo.cs

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+using System.Reflection;
+using System.Runtime.CompilerServices;
+using System.Runtime.InteropServices;
+
+// General Information about an assembly is controlled through the following 
+// set of attributes. Change these attribute values to modify the information
+// associated with an assembly.
+[assembly: AssemblyTitle("ConsoleApplicationObserver")]
+[assembly: AssemblyDescription("")]
+[assembly: AssemblyConfiguration("")]
+[assembly: AssemblyCompany("")]
+[assembly: AssemblyProduct("ConsoleApplicationObserver")]
+[assembly: AssemblyCopyright("Copyright ©  2016")]
+[assembly: AssemblyTrademark("")]
+[assembly: AssemblyCulture("")]
+
+// Setting ComVisible to false makes the types in this assembly not visible 
+// to COM components.  If you need to access a type in this assembly from 
+// COM, set the ComVisible attribute to true on that type.
+[assembly: ComVisible(false)]
+
+// The following GUID is for the ID of the typelib if this project is exposed to COM
+[assembly: Guid("cd02e043-b1b5-47db-b373-3a507477e848")]
+
+// Version information for an assembly consists of the following four values:
+//
+//      Major Version
+//      Minor Version 
+//      Build Number
+//      Revision
+//
+// You can specify all the values or you can default the Build and Revision Numbers 
+// by using the '*' as shown below:
+// [assembly: AssemblyVersion("1.0.*")]
+[assembly: AssemblyVersion("1.0.0.0")]
+[assembly: AssemblyFileVersion("1.0.0.0")]

ConsoleApplicationPacManObserver/App.config

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+<?xml version="1.0" encoding="utf-8" ?>
+<configuration>
+    <startup> 
+        <supportedRuntime version="v4.0" sku=".NETFramework,Version=v4.5.2" />
+    </startup>
+</configuration>

ConsoleApplicationPacManObserver/ClassDiagram1.cd

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+<?xml version="1.0" encoding="utf-8"?>
+<ClassDiagram /> 

ConsoleApplicationPacManObserver/ClassDiagramObserver.cd

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+<?xml version="1.0" encoding="utf-8"?>
+<ClassDiagram /> 

ConsoleApplicationPacManObserver/ConsoleApplicationObserver.csproj

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+<?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>{CD02E043-B1B5-47DB-B373-3A507477E848}</ProjectGuid>
+    <OutputType>Exe</OutputType>
+    <AppDesignerFolder>Properties</AppDesignerFolder>
+    <RootNamespace>ConsoleApplicationObserver</RootNamespace>
+    <AssemblyName>ConsoleApplicationObserver</AssemblyName>
+    <TargetFrameworkVersion>v4.5.2</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="Ghost.cs" />
+    <Compile Include="IObserver.cs" />
+    <Compile Include="IPacmanObserver.cs" />
+    <Compile Include="IPacmanSubject.cs" />
+    <Compile Include="ISubject.cs" />
+    <Compile Include="Pacman.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>

ConsoleApplicationPacManObserver/Ghost.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace ConsoleApplicationObserver
+{
+    public class Ghost : IPacmanObserver
+    {
+        IPacmanSubject pacSub;
+
+        public Ghost(IPacmanSubject pac)
+        {
+            this.pacSub = pac;
+            this.pacSub.Attach(this);
+        }
+
+        #region IObserver Members
+
+        public void Update(PacState p)
+        {
+            Console.WriteLine(string.Format("{0} has been updated pacman state is {1}", this, p));
+        }
+
+        public void Update()
+        {
+            Console.WriteLine(string.Format("{0} has been updated", this));
+        }
+
+        #endregion
+
+        public void Die()
+        {
+            this.pacSub.Detach(this);
+        }
+    }
+}

ConsoleApplicationPacManObserver/IObserver.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace ConsoleApplicationObserver
+{
+    public interface IObserver
+    {
+        void Update();
+    }
+}

ConsoleApplicationPacManObserver/IPacmanObserver.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace ConsoleApplicationObserver
+{
+    public interface IPacmanObserver : IObserver
+    {
+        void Update(PacState p);
+    }
+}

ConsoleApplicationPacManObserver/IPacmanSubject.cs

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+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+
+namespace ConsoleApplicationObserver
+{
+    public interface IPacmanSubject : ISubject
+    {
+        List<IPacmanObserver> observers { get; set; }
+
+        void Attach(IPacmanObserver o);
+
+        void Detach(IPacmanObserver o);
+    }
+}