C# Singleton pattern with triggerable initialization

Question

I need a singleton that:

• is lazy loaded
• is thread safe
• loads some values at construction
• those values can be queried at any time

Answer 1

You can set up an Initialize method that can be fired from outside, if you need the initialize to happen later, but if the values are different on each time it is fired, then it cannot be static, which violates the Singleton pattern.

Based on your example, which has no variables, I assume you are just delaying when the initialization happens (routine rather than constructor), but your question suggests you want different values, but if multiple initializations happen close together, it only initializes once, so I am a bit confused on this.

I am not sure you need a Singleton only implmentation, but cannot fully answer without information on whether or not the Initialize() runs the same code every time or has some type of variable nature.