how to conditionally include an item in dictionary initialization block

I have a static dictionary field. How do I conditonally include a 3rd item based on a certain condition?

public static  Dictionary<int, Object> dic = new Dictionary<int,Object>{

{1, new Object()},
{2, new Object()},

};

>Solution :

I think the condition is static too. So you could use a Static Contructor to initiliaze the Dictionary with conditions.