How to Add or Update value in C# Dictionary?

Asked Jun 11 '23 at 07:45

Active Jun 11 '23 at 07:47

Viewed 38 times

I faced this type of code and it seems to me that it can be more cleaner. What do you think of that? Can I use some function to do it better?

var dictionary = new Dictionary<int, int>();

        foreach (var n in nums)
        {
            if (dictionary.ContainsKey(n))
                dictionary[n]++;
            else
                dictionary.Add(n, 1);
        }

I tried to use "TryGetValue" method but it didn't help

edited Jun 11 '23 at 07:47

Fildor

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asked Jun 11 '23 at 07:45

yaroslove

since .net framework 2 you can just write `dictionary[n]++` no need to look if key exists. – Sebastian Siemens Jun 11 '23 at 08:45
1

@SebastianSiemens - are you sure https://dotnetfiddle.net/onhI33 – Rand Random Jun 11 '23 at 09:20
@RandRandom You are right. The run-time processing of a postfix increment or decrement operation of the form x++ or x-- will invoke get before invoking set. The get will throw exception if element is not present. – Sebastian Siemens Jun 12 '23 at 15:01

How to Add or Update value in C# Dictionary?

0 Answers0