Andrew Ducker Andrew Ducker - 5 days ago 5
C# Question

Is there any way of just not bothering with an out parameter in c#?

I'm making a call:

myResult = MakeMyCall(inputParams, out messages);


but I don't actually care about the messages. If it was an input parameter I didn't care about I'd just pass in a null. If it was the return I didn't care about I'd just leave it off.

Is there a way to do something similar with an out, or do I need to declare a variable that I will then ignore?

Answer

You have to declare a variable which you will then ignore. This is most commonly the case with the TryParse (or TryWhatever) pattern, when it is used to test the validity of user input (e.g. can it be parsed as a number?) without caring about the actual parsed value.

You used the word "dispose" in the question, which I suspect was just unfortunate - but if the out parameter is of a type which implements IDisposable, you should certainly call Dispose unless the method documentation explicitly states that receiving the value doesn't confer ownership. I can't remember ever seeing a method with a disposable out parameter though, so I'm hoping this was just an unlucky choice of words.

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