通过锁字符串达到控制并发的效果C#

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<string> keyList = new List<string> { "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");

            }
        }

    }
}

　　运行

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<string> keyList = new List<string> {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

原文地址：http://www.cnblogs.com/ProDoctor/p/7619847.html