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Posted 12 Sep 2007

My Personal and Also Another Approach to Handling the Singleton Design Pattern

, 14 Sep 2007
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Quick and simple use of the singleton design pattern


I wanted to have my own and simple handling for the singleton design pattern without implementing it many times. Singleton is an object-based creation pattern. You should implement it to ensure that only one instance of a class exists to have a global access point.

I often used the singleton design pattern to hold the settings of a configuration file. However, I had to implement the pattern every time and sometimes I had to write a method for initializing some variables of the instance, as well as implement a check to watch for instance initialization. I needed a quick and simple way to use the singleton design pattern... And here comes my approach to solving this.

Using the Code

I delegated creation and initialization of the singleton class instance to a generic builder class called UZi.Singleton.SingletonBuilder<T>. See more details in my source code. You can (and should) check the arguments for the constructor of your singleton class with the delegate UZi.Singleton.SingletonClassConstructorArgsChecker. Now you can write code like this, if x is a defined class:

x singletonInstanceOfX = UZi.Singleton.Singleton<x>, 
    new object[] { 1, "string_value" });

You can now use singletonInstanceOfX everywhere in your application and you only ever have this one instance of x. Don't forget to make the constructor of your class, which should be a singleton class, private or protected!

Points of Interest

With my approach, you can simply use the singleton design pattern. You'll never have to implement it for a class serving as a singleton instance. We also never have to implement a builder class to build an initialized instance of our singleton class. Use the generic code and save time.


  • 2007-09-12: First version
  • 2007-09-12: Tried to fix some formatting mistakes


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About the Author

Web Developer
Germany Germany
.NET Professional: 'specialist for application development' (a german job title)

I normally develop applications in C# with the .net-framework 2.0+/3.0 and currently databases for MS Sql Server 2005 and MS Access 2003+.

I'm an employee of an office which is working for insurances and which is watching investigations of damages for incorrect items, plausibility and so on and my job is to develop software to automate these processes. I developed for example an application which can extract values from ocr-texts using regular expressions and save these values into a database for later calculations or other processes.

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Comments and Discussions

GeneralFurther reading Pin
Peter Ritchie17-Sep-07 10:59
memberPeter Ritchie17-Sep-07 10:59 
GeneralThanks for your contribution Pin
jonnii12-Sep-07 7:31
memberjonnii12-Sep-07 7:31 
AnswerRe: Thanks for your contribution Pin
SaxoniaCoder12-Sep-07 19:47
memberSaxoniaCoder12-Sep-07 19:47 
GeneralRe: Thanks for your contribution Pin
jonnii12-Sep-07 23:48
memberjonnii12-Sep-07 23:48 
GeneralRe: Thanks for your contribution Pin
Peter Ritchie17-Sep-07 10:53
memberPeter Ritchie17-Sep-07 10:53 
GeneralRe: Thanks for your contribution Pin
Phil_N13-Sep-07 0:03
memberPhil_N13-Sep-07 0:03 
GeneralRe: Thanks for your contribution Pin
Urs Enzler17-Sep-07 23:39
memberUrs Enzler17-Sep-07 23:39 
I just have to give my opinion, too:

SaxoniaCoder wrote:
I think singletons are the only way to get sure that there is only one instance of a class

Not really. Take the Service Locater pattern for instance, or a sort of Factory or Provider that returns always the same instance for a specific query.

In my projects, I never use the singleton pattern anymore, because the patterns mentioned above are much more flexible because they allow configuration (which class to instantiate for a requested interface for example), better testing (replacement of real instances with mocks (with the use of the configuration)).

And as mentioned in another post the use of singletons leads to tightly coupled code, whereas a service locater pattern leads to loosely coupled systems which are better testable, maintainable and most important more fun Wink | ;)

But if you really want to use the singleton pattern, then this is a nice use of generics for it.

no risk no funk ................... please vote ------>

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