转换字典< String，Int>到字典< String，SomeEnum>使用LINQ?

问题描述

我试图找到一个需要Dictionary< String，Int>的LINQ oneliner.并返回一个Dictionary< String，SomeEnum> ....它可能是不可能的，但是会很好.

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.

有什么建议吗?

ToDictionary()是显而易见的选择，但是你们当中有人尝试过吗?在Dictionary上，它的工作方式与在Enumerable上不一样.您不能向其传递键和值.

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.

编辑#2:哎呀，我在这行上有一个错字，搞砸了编译器.一切都很好.

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

推荐答案

通过简单的强制转换即可直接使用.

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);

---

我使用了此测试，并且没有失败.

---

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);
        }
    }
}

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