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C#中字典集合HashTable、Dictionary、ConcurrentDictionary三者区别
学习参考博客：http://www.cnblogs.com/yinrq/p/5584885.html
使用Stopwatch类测试耗时代码：
using System;using System.Collections;using System.Collections.Concurrent;using System.Collections.Generic;using System.Diagnostics;namespace WebApp{ class Program { static Hashtable _hashtable; static Dictionary<string, string> _dictionary; static ConcurrentDictionary<string, string> _conDictionary; static void Main(string[] args) { Compare(5000000); Console.ReadLine(); Console.Read(); } public static void Compare(int dataCount) { _hashtable = new Hashtable(); _dictionary = new Dictionary<string, string>(); _conDictionary = new ConcurrentDictionary<string, string>(); Stopwatch stopWatch = new Stopwatch(); // Hashtable stopWatch.Start(); for (int i = 0; i < dataCount; i++) { _hashtable.Add("key" + i.ToString(), "Value" + i.ToString()); } stopWatch.Stop(); Console.WriteLine("HashTable插" + dataCount + "条耗时(毫秒)：" + stopWatch.ElapsedMilliseconds); //Dictionary stopWatch.Reset(); stopWatch.Start(); for (int i = 0; i < dataCount; i++) { _dictionary.Add("key" + i.ToString(), "Value" + i.ToString()); } stopWatch.Stop(); Console.WriteLine("Dictionary插" + dataCount + "条耗时(毫秒)：" + stopWatch.ElapsedMilliseconds); //ConcurrentDictionary stopWatch.Reset(); stopWatch.Start(); for (int i = 0; i < dataCount; i++) { _conDictionary.TryAdd("key" + i.ToString(), "Value" + i.ToString()); } stopWatch.Stop(); Console.WriteLine("ConcurrentDictionary插" + dataCount + "条耗时(毫秒)：" + stopWatch.ElapsedMilliseconds); // Hashtable stopWatch.Reset(); stopWatch.Start(); for (int i = 0; i < _hashtable.Count; i++) { var key = _hashtable[i]; } stopWatch.Stop(); Console.WriteLine("HashTable遍历时间(毫秒)：" + stopWatch.ElapsedMilliseconds); //Dictionary stopWatch.Reset(); stopWatch.Start(); for (int i = 0; i < _hashtable.Count; i++) { var key = _dictionary["key" + i.ToString()]; } stopWatch.Stop(); Console.WriteLine("Dictionary遍历时间(毫秒)：" + stopWatch.ElapsedMilliseconds); //ConcurrentDictionary stopWatch.Reset(); stopWatch.Start(); for (int i = 0; i < _hashtable.Count; i++) { var key = _conDictionary["key" + i.ToString()]; } stopWatch.Stop(); Console.WriteLine("ConcurrentDictionary遍历时间(毫秒)：" + stopWatch.ElapsedMilliseconds); } }}
最后总结：
大数据插入Dictionary花费时间最少
遍历HashTable最快是Dictionary的1/5,ConcurrentDictionary的1/10
单线程建议用Dictionary，多线程建议用ConcurrentDictionary或者HashTable（Hashtable tab = Hashtable.Synchronized(new Hashtable());获得线程安全的对象）
C#中字典集合HashTable、Dictionary、ConcurrentDictionary三者区别
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