Get a value from dictionnary

Question

I'm stuck on something probably easy but I can't find how to solve that So It's the first time I used the dictionnary and in my code I have declared my variable:

Private Dictionary<string, bool> g_objDictionnary =new Dictionary<string, bool>();

and In my code I'd like to do something like:

If my g_objDictionnary bool for this key is true so do that. Which function have to use to do that?

Thanks for your help

Have a look at [this](http://www.tutorialsteacher.com/csharp/csharp-dictionary) for an introduction to the C# `Dictionary` type. — croxy, Aug 24 '18 at 07:27
https://stackoverflow.com/questions/16906675/dictionary-direct-access-vs-trygetvalue — Rui Jarimba, Aug 24 '18 at 07:27

croxy · Answer 1 · 2018-08-24T07:34:06.433

4

For an one liner to check if the key exists and get its value if so, you can do something like this:

if (g_objDictionnary.TryGetValue("some_key", out var value) && value) {
   // Do something
}

Edit
As HimBromBeere stated in the comments this syntax will only work for C#7 and higher. If you are using a version of C# below 7 you have to declare value beforehand:

bool value;
if (g_objDictionnary.TryGetValue("some_key", out value) && value) {
   // Do something
}

edited Aug 24 '18 at 07:34

answered Aug 24 '18 at 07:29

croxy

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works only from C#7 onwards. Before you´d have to declare `value` outside the statement. – MakePeaceGreatAgain Aug 24 '18 at 07:31

score 2 · Answer 2 · answered Aug 24 '18 at 07:27

2

if(g_objDictionnary.ContainsKey(yourKey))
 if(g_objDictionnary[yourKey] == true)
 {
 }

answered Aug 24 '18 at 07:27

aozk

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score 0 · Accepted Answer · answered Aug 24 '18 at 07:25

0

Since it's already a bool, you can just this:

if (g_objDictionnary["some_key"]) {
    // Go!
}

This assumes the key already exists in your dictionary.

answered Aug 24 '18 at 07:25

Evan Trimboli

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Thank you, Yes before I checked if my key is in my dictionnary – Cookistador Aug 24 '18 at 07:33

Get a value from dictionnary

3 Answers3