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45 lines (41 loc) · 1.22 KB
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using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
namespace SingletonPattern
{
class Singleton
{
private static Singleton _instance;
private static object _lockObject = new object();//Made thread safe for multi-thread applications.
private Singleton() { }
public static Singleton GetInstance()
{
if (_instance == null)
{
lock (_lockObject)
{
if (_instance == null)
{
_instance = new Singleton();
}
}
}
return _instance;
}
}
class WhenUseSingleton
{
//Singleton singleton = new Singleton(); Dont work
Singleton singleton = Singleton.GetInstance();
}
}
/*
The Logic:
It is to ensure that the instance of a class is unique at runtime.
With the constructor method marked as private, it cannot be used by
the instance constructor at runtime. Instead, a method is defined as a
static method if it does not exist before, it is produced, and if
there is, it is intended to be used without generating a new one.
*/