C# 使用 LINQ 将 Dictionary<String,Int> 转换为 Dictionary<String,SomeEnum>？
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Convert Dictionary<String,Int> to Dictionary<String,SomeEnum> using LINQ?
提问by FlySwat
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.
我试图找到一个 LINQ oneliner，它接受一个 Dictionary<String,Int> 并返回一个 Dictionary<String,SomeEnum> ......这可能是不可能的，但会很好。
Any suggestions?
有什么建议？
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.
编辑： ToDictionary() 是显而易见的选择，但你们有没有真正尝试过？在字典上它与在 Enumerable 上的工作方式不同......您不能将键和值传递给它。
EDIT #2: Doh, I had a typo above this line screwing up the compiler. All is well.
编辑#2：Doh，我在这一行上面有一个错字，搞砸了编译器。一切都很好。
采纳答案by Daniel Brückner
It works straight forward with a simple cast.
它通过简单的演员表直接工作。
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);
I used this test and it does not fail.
我使用了这个测试，它没有失败。
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);
}
}
}
回答by Samuel
var result = dict.ToDictionary(kvp => kvp.Key,
kvp => (SomeEnum)Enum.ToObject(typeof(SomeEnum), kvp.Value));
回答by Stand__Sure
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;
});
