Question

Is there a keyword to ‘do nothing’ in C#?

For example I want to use a ternary operator where one of the actions is to take no action:

officeDict.ContainsKey("0") ? DO NOTHING : officeDict.Add("0","")

Answer 1

No, there is no such keyword. Besides, the ?: operator is not meant for deciding actions. It’s meant for deciding values (or, more technically, value expressions).

You really, really want to use an if condition for this sort of decision-making instead:

if (!officeDict.ContainsKey("0"))
    officeDict.Add("0", "");