Question

I’m trying to find a LINQ oneliner that takes a Dictionary<String,Int> and returns a Dictionary<String,SomeEnum>….it might not be possible, but would be nice.

Any suggestions?

EDIT: ToDictionary() is the obvious choice, but have any of you actually tried it? On a Dictionary it doesn’t work the same as on a Enumerable… You can’t pass it the key and value.

EDIT #2: Doh, I had a typo above this line screwing up the compiler. All is well.

Answer 1

It works straight forward with a simple cast.

Dictionary<String, Int32> input = new Dictionary<String, Int32>();  // Transform input Dictionary to output Dictionary  Dictionary<String, SomeEnum> output =    input.ToDictionary(item => item.Key, item => (SomeEnum)item.Value); 

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I used this test and it does not fail.

using System; using System.Collections.Generic; using System.Linq; using System.Diagnostics;  namespace DictionaryEnumConverter {     enum SomeEnum { x, y, z = 4 };      class Program     {         static void Main(string[] args)         {                        Dictionary<String, Int32> input =                new Dictionary<String, Int32>();              input.Add('a', 0);             input.Add('b', 1);             input.Add('c', 4);              Dictionary<String, SomeEnum> output = input.ToDictionary(                pair => pair.Key, pair => (SomeEnum)pair.Value);              Debug.Assert(output['a'] == SomeEnum.x);             Debug.Assert(output['b'] == SomeEnum.y);             Debug.Assert(output['c'] == SomeEnum.z);         }     } }