Asked by: Marija Dannehl
asked in category: General Last Updated: 7th January, 2020

What is singleton in C?

Essentially, a singleton is a class which only allows a single instance of itself to be created, and usually gives simple access to that instance. Typically a requirement of singletons is that they are created lazily - i.e. that the instance isn't created until it is first needed.

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In this manner, what is a singleton in programming?

A singleton is a class that allows only a single instance of itself to be created and gives access to that created instance. It contains static variables that can accommodate unique and private instances of itself. It is used in scenarios when a user wants to restrict instantiation of a class to only one object.

Beside above, why do we need Singleton pattern in C#? We need to use the Singleton Design Pattern in C# when we need to ensures that only one instance of a particular class is going to be created and then provide simple global access to that instance for the entire application. Once the client gets the singleton instance then they invoke the methods.

Also to know is, where do we use Singleton pattern in C#?

  1. To preserve global state of a type.
  2. To share common data across application.
  3. To reduce overhead of instantiating a heavy object again and again.
  4. Suitable for Facades and Service proxies.
  5. To cache objects in-memory and reuse them throughout the application.

What is Singleton used for?

It is used where only a single instance of a class is required to control the action throughout the execution. A singleton class shouldn't have multiple instances in any case and at any cost. Singleton classes are used for logging, driver objects, caching and thread pool, database connections.

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