Tutorial :Convert Dictionary to Dictionary using LINQ?



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.


Solution:1

It works straight forward with a simple cast.

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

I used this test and it does not fail.

using System;  using System.Collections.Generic;  using System.Linq;  using System.Diagnostics;    namespace DictonaryEnumConverter  {      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);          }      }  }  


Solution:2

var result = dict.ToDictionary(kvp => kvp.Key,                 kvp => (SomeEnum)Enum.ToObject(typeof(SomeEnum), kvp.Value));  


Solution:3

var collectionNames = new Dictionary<Int32,String>();  Array.ForEach(Enum.GetNames(typeof(YOUR_TYPE)), name =>   {     Int32 val = (Int32)Enum.Parse(typeof(YOUR_TYPE), name, true);     collectionNames[val] = name;   });   

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