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Creational/DesignPatterns.Singleton/DesignPatterns.Singleton.csproj
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| <Project Sdk="Microsoft.NET.Sdk"> | ||
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| <PropertyGroup> | ||
| <TargetFramework>net8.0</TargetFramework> | ||
| <ImplicitUsings>enable</ImplicitUsings> | ||
| <Nullable>enable</Nullable> | ||
| </PropertyGroup> | ||
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| </Project> |
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| namespace DesignPatterns.Singleton; | ||
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| public class SingletonWithLazy | ||
| { | ||
| private static readonly Lazy<SingletonWithLazy> instance = new(() => new SingletonWithLazy()); | ||
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| /// <summary> | ||
| /// The private constructor is declared to prevent instantiation directly, via calling a default constructor. | ||
| /// </summary> | ||
| private SingletonWithLazy() | ||
| { | ||
| Console.WriteLine($"An instance of {nameof(SingletonWithLazy)} has been created."); | ||
| } | ||
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| public static SingletonWithLazy Instance => instance.Value; | ||
| } |
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| namespace DesignPatterns.Singleton; | ||
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| public class SingletonWithLock | ||
| { | ||
| private static SingletonWithLock? instance = null; | ||
| private static readonly object syncObject = new(); | ||
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| /// <summary> | ||
| /// The private constructor is declared to prevent instantiation directly, via calling a default constructor. | ||
| /// </summary> | ||
| private SingletonWithLock() | ||
| { | ||
| Console.WriteLine($"An instance of {nameof(SingletonWithLock)} has been created."); | ||
| } | ||
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| public static SingletonWithLock Instance | ||
| { | ||
| get | ||
| { | ||
| // The cost of executing the lock operation is significantly higher | ||
| // in comparison to the straightforward pointer check `instance != null`. | ||
| lock (syncObject) | ||
| { | ||
| return instance ??= new SingletonWithLock(); | ||
| } | ||
| } | ||
| } | ||
| } |
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