Converting List of Int Array to Dictionary

Deer Park

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.

3 Replies

Know the answer? Post it — somebody with the same question will find it here.

Vulpes13y ago
Accepted 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 < value.Length; i++)
{
Console.Write(value[i]);
if (i < value.Length - 1) Console.Write(" ,");
}
Console.WriteLine("}}");
}
}
}

The results are the same as before.
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Deer Park13y ago
Thanks Again Vulpes for the help!! Did worked.. Appreciated!
0
Vulpes13y ago
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 < value.Length; i++)
{
Console.Write(value[i]);
if (i < value.Length - 1) Console.Write(" ,");
}
Console.WriteLine("}}");
}
}
}

The output should be:

{1234, {1 ,2 ,3 ,4}}
{2345, {2 ,3 ,4 ,5}}
{7890, {7 ,8 ,9 ,0}}

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