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simple Asp.net singleton

, 26 Oct 2011 CPOL
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simple Asp.net singleton
This creates a session singleton. In this example I am persisting a stringbuilder however you generally want a wrapper object in the case where you have two items that need persisting for that page. To generate the unique strings you can reflect the page name. Using this shows that you should rarely/never use Session.add ( within the same page context. ) Between pages will require some more error handling but will work as well. You can also use a per request session in some cases but that is beyond this sample.
 

 
/// <summary>
/// Persist the xml property as if it was a local variable.
/// </summary>
private StringBuilder xml
{
    get
    {
        return (HttpContext.Current.Session["UNIQUESTRINGHERE"] ??
        (HttpContext.Current.Session["UNIQUESTRINGHERE"] =
        new StringBuilder())) as StringBuilder;
    }
}

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This article, along with any associated source code and files, is licensed under The Code Project Open License (CPOL)

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rj45
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Comments and Discussions

 
GeneralMarcus, Singleton means single instance and nothing more. In... Pinmemberrj4527-Oct-11 6:29 
Marcus, Singleton means single instance and nothing more. In asp.net we multiple scopes of singletons ( not just static ). You may be expecting simply static, which would be single instance server wide, however in asp.net that is rarely what we want. My example gives us a single instance per session which is a singleton of the session context. If you want it per Request then you could use HttpContext.Current.Items.add rather than session which is a singleton of the request scope.
 

 
As you know, If you want it accessible from throughout the application make the property public static.
GeneralReason for my vote of 1 This is not a singleton. This is not... PinmemberMarcus Kramer27-Oct-11 4:45 

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