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The Easiest Way to Learn Design Patterns in C#

Singleton: Implementation and Example

Learn the Singleton design pattern by implementing an example program.

We'll cover the following...

Implementing the Singleton design pattern

We’ll create a .NET console application and add a Singleton class to it. For this purpose, we will add the SingletonObject.cs file with the following content:

C#
namespace Singleton_Demo;
internal class SingletonObject
{
  private static SingletonObject? instance;
  public static SingletonObject GetInstance() 
  {
    if (instance is null) 
    {
      var random = new Random();
      instance = new SingletonObject(random.Next()); 
    }
    return instance;
  }
  private SingletonObject(int data) 
  {
    Data = data; 
  }
  public int Data 
  { 
    get; private set; 
  }
}
...