What is the best way to implement Singleton Design Pattern in C# with performance constraint?
Please let me know what the best way to implement Singleton Design Pattern in C# with performance constrain开发者_Go百科t?
Paraphrased from C# in Depth: There are various different ways of implementing the singleton pattern in C#, from Not thread-safe to a fully lazily-loaded, thread-safe, simple and highly performant version.
Best version - using .NET 4's Lazy type:
public sealed class Singleton
{
private static readonly Lazy<Singleton> lazy =
new Lazy<Singleton>(() => new Singleton());
public static Singleton Instance { get { return lazy.Value; } }
private Singleton()
{
}
}
It's simple and performs well. It also allows you to check whether or not the instance has been created yet with the IsValueCreated property, if you need that.
public class Singleton
{
static readonly Singleton _instance = new Singleton();
static Singleton() { }
private Singleton() { }
static public Singleton Instance
{
get { return _instance; }
}
}
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