C # Inverse elements in a dictionary

Question

I am trying to swap elements in a dictionary in C #. I tried:

Dictionary<double, int> dict = new Dictionary<double, int>();
...add itmes to it....
var v = dict.Reverse()

However, dict.Reverse () gives me an IEnumberable> type. I'm just wondering how can I do this with the Dictionary?

Thanks in advance.

Answer 1

A dictionary is not an ordered data structure. For Reverse to make any real sense, you need to use SortedDictionary. You can get a reverse copy of SortedDictionary by creating a new one using Comparer, which does the opposite sort with the original (see constructor ).

var reversed = new SortedDictionary( original, new ReverseKeyComparer() );

Note that ReverseKeyComparerthis is a dummy class for example.

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Answer 2

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Answer 3

If you want the dictionaries to have a specific order, you should look in the SortedDictionary. See this article.