Question

Whats the difference between the teo snippets?

Snippet 1:

{
  Dictionary<MyCLass, bool> dic;
  MyFunc(out dic);
}

Snippet 2:

{
  Dictionary<MyCLass, bool> dic = null;
  MyFunc(out dic);
}

Is snippet 2 better in performance?

Answer 1

Technically speaking the second code snippet will likely execute more instructions than the first by doing a redundant null set. I’m hedging with likely here because the C# spec may allow for the flexibility of ignoring this set. I don’t know off hand.

However I would seriously doubt that would ever noticeably affect performance of an application. I certainly would not code for that optimization but would instead prefer the solution which I found more understandable.