lock锁的是地址

而.net有内部机制使得相同的字符串内存地址是相同的(new string)除外

下面上实验代码

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;using System.Threading.Tasks; namespace ConsoleApp5{    class Program    {        static void Main(string[] args)        {            List
     
       keyList = new List
      
        { "key1","key2", "key1", "key1", "key1", "key1", };             keyList.ForEach(u =>            {                ThreadPool.QueueUserWorkItem(s =>                {                    test.lockTestByString(u);                });             });             Console.Read();        }    }    public class test {         public static void lockTestByString(string key)        {            lock (key)            {                Console.WriteLine("上锁2s key="+key);                Thread.Sleep(2000);                Console.WriteLine("解锁");             }        }     }}
      
     

using System;using System.Collections.Generic;using System.Linq;using System.Text;using System.Threading;using System.Threading.Tasks; namespace ConsoleApp5{    class Program    {        static void Main(string[] args)        {            List
     
       keyList = new List
      
        {
   new string('k',1), new string('k', 1), new string('k', 1), new string('k', 1) };             keyList.ForEach(u =>            {                ThreadPool.QueueUserWorkItem(s =>                {                    test.lockTestByString(u);                });             });             Console.Read();        }    }    public class test {         public static void lockTestByString(string key)        {            lock (key)            {                Console.WriteLine("上锁2s key="+key);                Thread.Sleep(2000);                Console.WriteLine("解锁");             }        }     }}
      
     

通过new字符串得出的运行结果

 

 转自：https://www.cnblogs.com/ProDoctor/p/7619847.html