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Singleton Design Pattern in C#

This article describes the singleton class design pattern in C#.

Purpose

A singleton pattern means limiting the maximum number of instances of a class to one. The class that implements the singleton pattern is called the Singleton Class.

Implementation

To create a singleton class, we will perform these two steps: -

Make the constructor of the class private.
Create a method that returns the instance of the class.

public class SingletonClass
{
    static SingletonClass _singletonClass;
    private SingletonClass()
    {

    }
    public static SingletonClass GetInstance()
    {
        if (_singletonClass == null)
            _singletonClass = new SingletonClass();

        return _singletonClass;
    }
}

By declaring _singletonClass as static, we are ensuring that there is only one instance of this variable shared across all instances of the class.

Calling The Singleton Class

Use the following code to call the singleton class: -

SingletonClass singletonClass = SingletonClass.GetInstance();

Posted By -	Karan Gupta

Posted On -	Sunday, October 10, 2010

Updated On -	Tuesday, February 6, 2024

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