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add singleton pattern
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4 files changed

+162
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‎Creational/Singleton/Program.cs

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using System;
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using System.Threading.Tasks;
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namespace Singleton {
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public class DoublecheckSingleton {
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private volatile static DoublecheckSingleton _instance;
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private DoublecheckSingleton() {
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}
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public static DoublecheckSingleton Instance {
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get {
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if (_instance == null) {
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lock (typeof(DoublecheckSingleton)) {
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if (_instance == null) {
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Console.WriteLine("Initialize a double check singleton.");
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_instance = new DoublecheckSingleton();
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}
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}
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}
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return _instance;
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}
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}
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}
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public class LazySingleton {
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private static readonly Lazy<LazySingleton> LazyInstance = new Lazy<LazySingleton>(() => {
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Console.WriteLine("Initialize a lazy singleton.");
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return new LazySingleton();
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});
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private LazySingleton() {
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}
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public static LazySingleton Instance {
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get {
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return LazyInstance.Value;
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}
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}
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}
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class Program {
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static void Main(string[] args) {
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for (int i = 0; i < 100; i++) {
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Task.Factory.StartNew(() => Console.WriteLine(DoublecheckSingleton.Instance.ToString()));
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}
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for (int i = 0; i < 100; i++) {
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Task.Factory.StartNew(() => Console.WriteLine(LazySingleton.Instance.ToString()));
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}
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Console.ReadKey();
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}
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}
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}

‎Creational/Singleton/Properties/AssemblyInfo.cs

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using System.Reflection;
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using System.Runtime.CompilerServices;
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using System.Runtime.InteropServices;
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// General Information about an assembly is controlled through the following
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// set of attributes. Change these attribute values to modify the information
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// associated with an assembly.
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[assembly: AssemblyTitle("Singleton")]
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[assembly: AssemblyDescription("")]
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[assembly: AssemblyConfiguration("")]
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[assembly: AssemblyCompany("")]
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[assembly: AssemblyProduct("Singleton")]
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[assembly: AssemblyCopyright("Copyright © 2012")]
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[assembly: AssemblyTrademark("")]
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[assembly: AssemblyCulture("")]
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// Setting ComVisible to false makes the types in this assembly not visible
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// to COM components. If you need to access a type in this assembly from
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// COM, set the ComVisible attribute to true on that type.
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[assembly: ComVisible(false)]
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// The following GUID is for the ID of the typelib if this project is exposed to COM
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[assembly: Guid("d14f4089-6605-4004-8400-853b36efe937")]
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// Version information for an assembly consists of the following four values:
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//
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// Major Version
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// Minor Version
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// Build Number
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// Revision
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//
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// You can specify all the values or you can default the Build and Revision Numbers
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// by using the '*' as shown below:
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// [assembly: AssemblyVersion("1.0.*")]
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[assembly: AssemblyVersion("1.0.0.0")]
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[assembly: AssemblyFileVersion("1.0.0.0")]

‎Creational/Singleton/Singleton.csproj

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<?xml version="1.0" encoding="utf-8"?>
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<Project ToolsVersion="4.0" DefaultTargets="Build" xmlns="http://schemas.microsoft.com/developer/msbuild/2003">
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<PropertyGroup>
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<Configuration Condition=" '$(Configuration)' == '' ">Debug</Configuration>
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<Platform Condition=" '$(Platform)' == '' ">x86</Platform>
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<ProductVersion>8.0.30703</ProductVersion>
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<SchemaVersion>2.0</SchemaVersion>
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<ProjectGuid>{14333E87-2DCC-42A7-91FF-2DFEABF2AA95}</ProjectGuid>
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<OutputType>Exe</OutputType>
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<AppDesignerFolder>Properties</AppDesignerFolder>
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<RootNamespace>Singleton</RootNamespace>
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<AssemblyName>Singleton</AssemblyName>
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<TargetFrameworkVersion>v4.0</TargetFrameworkVersion>
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<TargetFrameworkProfile>Client</TargetFrameworkProfile>
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<FileAlignment>512</FileAlignment>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Debug|x86' ">
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<PlatformTarget>x86</PlatformTarget>
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<DebugSymbols>true</DebugSymbols>
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<DebugType>full</DebugType>
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<Optimize>false</Optimize>
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<OutputPath>bin\Debug\</OutputPath>
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<DefineConstants>DEBUG;TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<PropertyGroup Condition=" '$(Configuration)|$(Platform)' == 'Release|x86' ">
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<PlatformTarget>x86</PlatformTarget>
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<DebugType>pdbonly</DebugType>
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<Optimize>true</Optimize>
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<OutputPath>bin\Release\</OutputPath>
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<DefineConstants>TRACE</DefineConstants>
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<ErrorReport>prompt</ErrorReport>
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<WarningLevel>4</WarningLevel>
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</PropertyGroup>
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<ItemGroup>
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<Reference Include="System" />
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<Reference Include="System.Core" />
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<Reference Include="System.Xml.Linq" />
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<Reference Include="System.Data.DataSetExtensions" />
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<Reference Include="Microsoft.CSharp" />
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<Reference Include="System.Data" />
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<Reference Include="System.Xml" />
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</ItemGroup>
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<ItemGroup>
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<Compile Include="Program.cs" />
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<Compile Include="Properties\AssemblyInfo.cs" />
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</ItemGroup>
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<Import Project="$(MSBuildToolsPath)\Microsoft.CSharp.targets" />
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<!-- To modify your build process, add your task inside one of the targets below and uncomment it.
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Other similar extension points exist, see Microsoft.Common.targets.
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<Target Name="BeforeBuild">
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</Target>
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<Target Name="AfterBuild">
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</Target>
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-->
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</Project>

‎DesignPatterns.sln

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@@ -35,6 +35,8 @@ Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "FactoryMethod", "Creational
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Prototype", "Creational\Prototype\Prototype.csproj", "{598AAD5B-C38A-4AC8-89C5-14CAC60AE46E}"
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EndProject
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Project("{FAE04EC0-301F-11D3-BF4B-00C04F79EFBC}") = "Singleton", "Creational\Singleton\Singleton.csproj", "{14333E87-2DCC-42A7-91FF-2DFEABF2AA95}"
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EndProject
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Global
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GlobalSection(SolutionConfigurationPlatforms) = preSolution
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Debug|Any CPU = Debug|Any CPU
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{598AAD5B-C38A-4AC8-89C5-14CAC60AE46E}.Release|Any CPU.ActiveCfg = Release|x86
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{598AAD5B-C38A-4AC8-89C5-14CAC60AE46E}.Release|x86.ActiveCfg = Release|x86
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{598AAD5B-C38A-4AC8-89C5-14CAC60AE46E}.Release|x86.Build.0 = Release|x86
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{14333E87-2DCC-42A7-91FF-2DFEABF2AA95}.Debug|Any CPU.ActiveCfg = Debug|x86
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{14333E87-2DCC-42A7-91FF-2DFEABF2AA95}.Debug|x86.ActiveCfg = Debug|x86
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{14333E87-2DCC-42A7-91FF-2DFEABF2AA95}.Debug|x86.Build.0 = Debug|x86
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{14333E87-2DCC-42A7-91FF-2DFEABF2AA95}.Release|Any CPU.ActiveCfg = Release|x86
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{14333E87-2DCC-42A7-91FF-2DFEABF2AA95}.Release|x86.ActiveCfg = Release|x86
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{14333E87-2DCC-42A7-91FF-2DFEABF2AA95}.Release|x86.Build.0 = Release|x86
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EndGlobalSection
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GlobalSection(SolutionProperties) = preSolution
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HideSolutionNode = FALSE
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{92346BF9-D8E8-4D1E-A3B6-48EA49BD9ADC} = {B9EDC98E-1E00-4320-A39F-7D64F44A2D3C}
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{040AFA71-3175-4C6C-8DB2-98810D3E98F4} = {B9EDC98E-1E00-4320-A39F-7D64F44A2D3C}
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{598AAD5B-C38A-4AC8-89C5-14CAC60AE46E} = {B9EDC98E-1E00-4320-A39F-7D64F44A2D3C}
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{14333E87-2DCC-42A7-91FF-2DFEABF2AA95} = {B9EDC98E-1E00-4320-A39F-7D64F44A2D3C}
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EndGlobalSection
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EndGlobal

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