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ASP.NET Patterns every developer should know

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  11 months ago

  by konikula

  Matej Kasper

  Trutnov, Czech Republic

  Joined 3 years ago
  As I am foreign to ASP.NET, I enjoyed general section a lot. You are good speaker, possibly sometimes there was to much words used where it could be easily shorten. But generally pretty interesting reading, and of course educative. I also like you included singleton, while it complements thema importantly, so that it is visible where it all also starts or just can begin :)
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  11 months ago

  by DonXML

  Don Demsak

  Morris County, United States

  Joined 11 months ago
  DO NOT USE THIS SINGLETON EXAMPLE CODE! It is not threadsafe! I've made this mistake before, and I've seen a lot of examples of Singleton done this way, but it is not threadsafe, which will cause you problems when using it in multi-threaded applications (like ASP.Net). The best code examples of ways to implement a Singleton in .Net can be found on Jon Skeet's site, [http://www.yoda.arachsys.com/csharp/singleton.html](http://www.yoda.arachsys.com/csharp/singleton.html). There are 5 examples of Singleon there, 3 NOT to use (including the version listed here) and 2 to use. And the best thing about the valid examples, no locks! Don Demsak www.donxml.com
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  11 months ago

  by AndyGrant2005

  Andrew Grant

  United Kingdon, United Kingdom

  Joined 11 months ago
  Thanks for that. Very good link. Andy Grant
  Post was edited on 19/11/2008 11:00:42 Report abuse
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  11 months ago

  by konikula

  Matej Kasper

  Trutnov, Czech Republic

  Joined 3 years ago
  Thanks. Very interesting idea. I like "full lazy" implementation of thread safe singleton
  
  internal static readonly Singleton instance = new Singleton();
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  11 months ago

  by James Crowley

  James Crowley

  London, United Kingdom

  Joined 8 years ago
  We have added a note in the article from the Alex Homer on the implementation of Singleton pattern to clarify the issues raised! (see below, and inline in the article) > Note that this implementation does not perform locking while it creates the instance. > In reality, in this specific scenario, if a second thread should create a second instance it will > not affect operation because the content is read-only and is the same for all instances. If you absolutely > need to confirm that only one instance can ever exist, you should apply locks while checking for > and creating the instance. For more details, see [Implementing the Singleton Pattern in C#](/article/9407/) and > [Data & Object Factory Singleton Pattern](http://www.dofactory.com/Patterns/PatternSingleton.aspx)
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  7 months ago

  by Michael Okarimia

  Michael Okarimia

  , United Kingdom

  Joined 3 years ago
  Thanks! This is a great read.
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  4 months ago

  by Manjot Bawa

  Manjot Bawa

  Delhi, India

  Joined 4 months ago

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