Дубликат ключа журнала Dictionary ArgumentException: какой более производительный? ⇐ C#

[Anonymous]

Here I add something to a Dictionary:

dictionary.Add(dictionaryKey, value); if dictionaryKey already exists, an ArgumentException will be thrown. Its message is fairly generic:

An item with the same key has already been added.

If my call to dictionary.Add is inside of a loop or a helper function, it can be hard to tell immediately what key has already been added that is throwing this exception. I would like to know this as easily and as soon as possible.

There are a few options.

1)

if (dictionary.ContainsKey(dictionaryKey)) { throw new ArgumentException($"An item with the same key ({dictionaryKey}) has already been added."); } dictionary.Add(dictionaryKey, value);

try { dictionary.Add(dictionaryKey, value); } catch (ArgumentException argumentException) { throw new ArgumentException($"An item with the same key ({dictionaryKey}) has already been added."); }

• Some other way

I know setting up a try/catch block takes a performance hit, but it seems running dictionary.ContainsKey(dictionaryKey) would mean an additional lookup each time too. Which of these options is most performant?


Источник: https://stackoverflow.com/questions/448 ... performant