Question

Is it possible to nest a singleton class inside a non-singleton class in C#, and if so, are there any restrictions to the life-cycle of the singleton in this case?

public class NonSingletonClass
{
  public NonSingletonClass()
  {
    // Initialize some stuff.
  }

  // Put some methods here.

  public class SingletonClass
  {
    // Singleton construction goes here.

    // Put some methods here.
  }
}

In the design of my application, this makes sense, but I need to know of any potential gotchas before I actually implement this.

EDIT: Specifically, I have a job host that executes tasks based on a timer. The NonSingletonClass in this case is an instantiation of a task. The SingletonClass is a repository of data that is used by NonSingletonClass, but can be modified from outside of NonSingletonClass. SingletonClass exists to ensure that even if there are multiple NonSingletonClass instances, there will still be only one set of instructions and data for all of them.

Answer 1

I believe you are looking for a monostate pattern

this link is a good description of this and offers contrats with a singleton pattern
monostate pattern