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Singleton Pattern in C#.
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| #region Singleton Pattern | |
| // NOTE: The class is marked as sealed to prevent the inheritance of the class (i.e. use it as base/super class). | |
| internal sealed class Singleton | |
| { | |
| private static readonly object SingletonSyncRoot = new object(); | |
| private static volatile Singleton _instanceSingleton; | |
| // NOTE: Default/Parameterless constructor is private to prevent instantiation of the class. | |
| private Singleton() | |
| { | |
| } | |
| public static Singleton Instance | |
| { | |
| get | |
| { | |
| // Double-checked locking pattern. | |
| if (_instanceSingleton != null) | |
| { | |
| return _instanceSingleton; | |
| } | |
| lock (SingletonSyncRoot) | |
| { | |
| return _instanceSingleton ?? (_instanceSingleton = new Singleton()); | |
| } | |
| } | |
| } | |
| } | |
| // NOTE: The class is marked as sealed to prevent the inheritance of the class (i.e. use it as base/super class). | |
| internal sealed class EagerSingleton | |
| { | |
| // NOTE: Default/Parameterless constructor is private to prevent instantiation of the class. | |
| private EagerSingleton() | |
| { | |
| } | |
| // CLR eagerly initializes static member when the class is first used | |
| // CLR guarantees thread-safety for static initialization | |
| public static EagerSingleton Instance | |
| { | |
| get; | |
| } = new EagerSingleton(); | |
| } | |
| #endregion Singleton Pattern |
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