Converting List of Int Array to Dictionary

Question

I have a list of int array . Say inputList ({1,2,3,4},{2,3,4,5},{7,8,9,0})

How do I convert it into a dictionary with key as concatination of number of int array and value as int array. So, inputDictionary would be like (1234, {1,2,3,4}) , ...

I am having hard time figuring out on using inputList.ToDictionary method.

Vulpes · Answer

Incidentally, as long as you're confident that the keys will never be duplicated (which might be difficult here), you can also do this using LINQ: using System; using System.Collections.Generic; using System.Linq; class Test { static void Main() { var inputList = new List {new[]{1,2,3,4}, new[]{2,3,4,5}, new[]{7,8,9,0}}; var dict = inputList.ToDictionary(ia => Convert.ToInt32(String.Concat(ia))); // check it worked foreach(int key in dict.Keys) { Console.Write("{{{0}, {{", key); int[] value = dict[key]; for(int i = 0; i { Console.Write(value[i]); if (i } Console.WriteLine("}}"); } } } The results are the same as before.

Vulpes · Answer

Try: using System; using System.Collections.Generic; class Test { static void Main() { var inputList = new List {new[]{1,2,3,4}, new[]{2,3,4,5}, new[]{7,8,9,0}}; var dict = new Dictionary (); foreach(int[] ia in inputList) { int concat = Convert.ToInt32(String.Concat(ia)); if(!dict.ContainsKey(concat)) dict.Add(concat, ia); } // check it worked foreach(int key in dict.Keys) { Console.Write("{{{0}, {{", key); int[] value = dict[key]; for(int i = 0; i { Console.Write(value[i]); if (i } Console.WriteLine("}}"); } } } The output should be: {1234, {1 ,2 ,3 ,4}} {2345, {2 ,3 ,4 ,5}} {7890, {7 ,8 ,9 ,0}}

Deer Park · Answer

Thanks Again Vulpes for the help!! Did worked.. Appreciated!