How to delay static initialization within a property

Question

I\'ve made a class that is a cross between a singleton (fifth version) and a (dependency injectable) factory. Call this a \"Mono-Factory?\" It works, and looks like this:<

Answer 1

A few hints:

Check out Generics

I avoid initialization using a static. This can cause odd problems in practice. For example if what you're constructing throws an error then the windows loader will tell you there's a problem but won't tell you what. Your code is never actually invoked so you don't have a chance for an exception to handle the problem. I construct the first instance when it's used the first time. Here's an example:

    private static OrderCompletion instance;

    /// 

    /// Get the single instance of the object
    /// 
    public static OrderCompletion Instance
    {
        get
        {
            lock (typeof(OrderCompletion))
            {
                if (instance == null)
                    instance = new OrderCompletion();
            }
            return instance;
        }
    }