create a dictionary using 2 lists using LINQ

Question

I am trying to create a dictionary from 2 lists where one list contains keys and one list contains values. I can do it using for loop but I am trying to find if there is a way of doing it using LINQ. Sample code will be helpfull. Thanks!!!!

Answer 1

        List<string> keys = new List<string>();
        List<string> values = new List<string>();
        Dictionary<string, string> dict = keys.ToDictionary(x => x, x => values[keys.IndexOf(x)]);

This of course assumes that the length of each list is the same and that the keys are unique.

Answer 2

        var  a = new List<string>() { "A", "B", "C" };
        var b = new List<string>() { "1", "2", "3" };

        var c = a.Select((x, i) => new {key = x, value = b[i]}).ToDictionary(e => e.key, e => e.value );

        foreach (var d in c)
            Console.WriteLine(d.Key + " = " + d.Value);

        Console.ReadKey();

Answer 3

In .NET4 you could use the built-in Zip method to merge the two sequences, followed by a ToDictionary call:

var keys = new List<int> { 1, 2, 3 };
var values = new List<string> { "one", "two", "three" };

var dictionary = keys.Zip(values, (k, v) => new { Key = k, Value = v })
                     .ToDictionary(x => x.Key, x => x.Value);