What is C# equivalent of in C++?

Question

I have defined a class myComplex. I need to map it to integers. In C++ I would have created a map as map<myComplex,int> first;

How to do such thing in C#?

My best guess would be you need a `Dictionary` but some more information would be nice. — gideon, Jan 17 '14 at 10:23

score 134 · Accepted Answer · answered Jan 17 '14 at 10:26

134

The equivalent would be class SortedDictionary<TKey, TValue> in the System.Collections.Generic namespace.

If you don't care about the order the class Dictionary<TKey, TValue> in the System.Collections.Generic namespace would probably be sufficient.

answered Jan 17 '14 at 10:26

dalle

3

If they don't care about order, `Dictionary` is more than sufficient, it's preferable. – Daniel Apr 19 '18 at 16:28
9

@Daniel: Yes, but that begs the question: why did they use 'map' in C++ if they didn't care about order? They could have used unordered_map in C++ (assuming they've been awake since C++11). – Dave Doknjas Apr 23 '18 at 13:57
@DaveDoknjas Agreed. My point is just that your statement was that given they don't care about order, `Dictionary` is "probably [...] sufficient". Actually, in the case where they don't care about order, `Dictionary` is more than sufficient; it's preferable. – Daniel Apr 24 '18 at 14:33

score 61 · Answer 2 · edited Apr 23 '18 at 08:55

61

std::unordered_map<Key, Value> → Dictionary<TKey, TValue>

edited Apr 23 '18 at 08:55

Vadim Ovchinnikov

answered Jan 17 '14 at 10:26

hansmaad

score 14 · Answer 3 · answered Jan 17 '14 at 10:25

14

Take a look at the Dictionary class in System::Collections::Generic.

Dictionary<myComplex, int> myMap = new Dictionary<myComplex, int>();

answered Jan 17 '14 at 10:25

score 1 · Answer 4 · answered Jan 17 '14 at 10:25

1

.NET Framework provides many collection classes too. You can use Dictionary in C#. Please find the below msdn link for details and samples http://msdn.microsoft.com/en-us/library/xfhwa508.aspx

answered Jan 17 '14 at 10:25

4 Answers4