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Implementing the Singleton Pattern in .NET

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Implementing the Singleton Pattern in .NET

The intent of the Singleton pattern as defined in Design Patterns is to "ensure a class has only one instance, and provide a global point of access to it".

What problem does this solve, or put another way, what is our motivation to use it? In nearly every application, there is a need to have an area from which to globally access and maintain some type of data. There are also cases in object-oriented (OO) systems where there should be only one class, or a predefined number of instances of a class, running at any given time. For example, when a class is being used to maintain an incremental counter, the simple counter class needs to keep track of an integer value that is being used in multiple areas of an application. The class needs to be able to increment this counter as well as return the current value. For this situation, the desired class behavior would be to have exactly one instance of a class that maintains the integer and nothing more.

At first glance, one might be tempted to create an instance of a counter class as a just a static global variable. This is a common technique but really only solves part of the problem; it solves the problem of global accessibility, but does nothing to ensure that there is only one instance of the class running at any given time. The responsibility of having only one instance of the class should fall on the class itself and not on the user of the class. The users of the class should always

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  Last updated on Saturday, 01 February 2014
  Author: rajeeva.nagarakanti
3/5 stars (4 vote(s))


Behind the Scenes - Discover the Design Patterns You're Already Using in the .NET Framework

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Behind the Scenes - Discover the Design Patterns You're Already Using in the .NET Framework

By Rob Pierry

This article discusses:

  • Common design patterns used in .NET Framework classes
  • Patterns used to implement the ASP.NET programming model and request pipeline
  • How patterns make programming tasks faster and easier

Contents

  • Observer Pattern
  • Iterator Pattern
  • Decorator Pattern
  • Adapter Pattern
  • Factory Pattern
  • Strategy Pattern
  • Composite Pattern in ASP.NET
  • Template Method Pattern
  • Patterns in the ASP.NET Pipeline
  • Intercepting Filter Pattern
  • Page Controller Pattern
  • Other Web Presentation Patterns in ASP.NET


In this article, I'll cover a basic overview of several common design patterns and how they are used in the BCL and other areas of the .NET Framework. In doing so, you can discover some of the motivation for why the Framework is designed the way it is, as well as make the abstract concepts of the patterns themselves more intuitively understandable.

If you are already familiar with some of these patterns, feel free to read about those you aren't familiar with, since each section is relatively independent. The section on ASP.NET-related patterns requires familiarity with the request pipeline, a basic overview of which is provided in that section.

Within the .NET Framework, the use of some patterns is so prevalent that they have been built into programming languages themselves, instead of just represented by the class libraries. The first two patterns I will discuss, the Observer and the Iterator, are supported

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  Last updated on Thursday, 24 October 2013
  Author: Mr. Ponna
4/5 stars (4 vote(s))

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