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博客园 - Snapping

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泛型 List 和 Dictionary 类的互相转换
Snapping · 2008-01-11 · via 博客园 - Snapping

using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;namespace testcs
{
    
class Program
    {
        
static void Main(string[] args)
        {
            ListAndDictionary();

        }

/// <summary>
        
/// 泛型 List 和 Dictionary 类的互相转换
        
/// </summary>
        private static void ListAndDictionary()
        {
            
// dict -> list 
            
// 转换为 List<T>,T 的类型是 KeyValuePair<TKey, TValue>
            Dictionary<stringint> d = new Dictionary<stringint>();
            var l 
= d.ToList();

            List

<KeyValuePair<stringint>> l2 = new List<KeyValuePair<stringint>>{
                
new KeyValuePair<string,int>("a"1),
                
new KeyValuePair<string,int>("b"2)
            };
// list -> dict 两种转换方式// 1. 可指定 keySelector 和 valueSelector;完全自定义字典 key, value 的类型            
            Dictionary<stringint> d2 = l2.ToDictionary(entry => entry.Key, entry => entry.Value);
            
// 2. 也可只指定 keySelector, value 为 entry 的值。
            Dictionary<float, KeyValuePair<stringint>> d3 = l2.ToDictionary(
                entry 
=> (float)entry.Value);
        }
    }
}