Is this code thread safe? (question about the use of lock statement)

[Guilherme Utrabo]

Hello everybody. Need some help with the "lock" statement.
I have the following structure on my Global.asax:

 

private static IList MyList;
private static object syncObject = new object();

void Application_PreRequestHandlerExecute(Object sender, EventArgs e)
{
      if (MyList == null)
      {
            lock (syncObject)
            {
                  MyList = new ArrayList();
                  MyList.Add("test");
            }
      }
}

 

When my application starts I want to populate "MyList" and then share it between the users.
But I want to make it once. Is my structure really thread safe? Should I use the lock on "MyList" instead of using it on the "syncObject"?

 

Thanks in advance.

 

Regards,
Guilherme

[Reuben Bartolo]

What you are trying to achieve there, is called the Singleton Design Pattern.

I suggest you do some research into it, and any pitfalls it might have.

Regards,

Reuben Bartolo

http://whatiseeinit.blogspot.com/ 

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[Rene Felix Correa]

Why you don't use the method Application_Start in the global.asax

This method only call when the app is start, and if you put in a static variable the content any user can acces this content.

Useful link's

http://en.wikipedia.org/wiki/Global.asax 

http://renefc3.wordpress.com/2012/04/21/vida-util-variaveis-asp-net-variavel-estatica-cache-e-variavel-de-sessao/ (portuguese from brazil)

--
Rene Felix Correa
Analista Desenvolvedor
http://renefc3.wordpress.com