Initialize Handler Array With Initial Value

[JasonBock]

Describe the solution you'd like
When I add a handler to the list, if the list is null, I first do new(), and then I add the new handler. If the list is null, there is a constructor overload to List<> that takes a IEnumerable<T> (and also checks/casts to ICollection<T>). It might be more efficient to, instead of what I'm currently doing:

if (this.Expectations.handlers0 is null ) { this.Expectations.handlers0 = new(); }
this.Expectations.handlers0.Add(@handler);

...to do this instead:

if (this.Expectations.handlers0 is null ) { this.Expectations.handlers0 = new([@handler]); }
else { this.Expectations.handlers0.Add(@handler); }

This would be a micro-optimization at best, so I won't do this unless I can see a clear "win" with this approach.

[JasonBock]

Another idea is to create a custom type that is basically a linked list but only keeps the first and last nodes internally referenced. The first time it's created, it sets first and last to the new handler. After that, a new handler would be set to what was last.

That's a pretty crappy way of describing what I want to do :). But I wanted to at least write this before I forgot. I have no idea if it'll be better, but, something to consider.