CODEWITHSUNDEEP
c#dictionary
Youssef
Youssef

Reputation: 33

How to lookup the value of a dictionary inside a dictionary in C#?

I have this transitionMap: Dictionary<Dictionary<int, char>, int> transitionMap;

And I also have this dictionary: Dictionary<int, char> dictionary = new Dictionary<int, char> {{0, 'a'}};.

How do I get the value inside transitionMap that corresponds to dictionary1.

This is what I've tried:

        Dictionary<int, char> dictionary = new Dictionary<int, char> {{stateNum, symbol}};

        if (this.transitionMap.ContainsKey(dictionary))
        {
            int nextState = this.transitionMap[dictionary];
            Console.WriteLine("nextstate {0}", nextState);
        }

Upvotes: 0

Views: 623

Answers (2)

vernou
vernou

Reputation: 7590

Solution with Linq :

class Program
{
    static void Main(string[] args)
    {
        var transitionMap = new Dictionary<Dictionary<int, char>, int>();
        var dictionary = new Dictionary<int, char> { { stateNum, symbol } };

        ...

        var found = transitionMap.Keys.FirstOrDefault(d => Equal(d, dictionary));
        if(found == null)
        {
            int nextState = transitionMap[found];
            Console.WriteLine("nextstate {0}", nextState);
        }
    }

    static bool Equal(Dictionary<int, char> a, Dictionary<int, char> b)
    {
        return a.Count == b.Count && a.All(akv => b.TryGetValue(akv.Key, out char bval) && akv.Value == bval);
    }
}

Upvotes: 1

Dialecticus
Dialecticus

Reputation: 16761

If you want to compare two dictionaries for equality then having a "super dictionary" will not help you in any way. You will have to manually compare all elements in two dictionaries.

First, compare the number of elements. Then run a loop through one dictionary, and with the key find the value in second dictionary, and if exists compare two values.

Upvotes: 2

Related Questions