通過鎖字串達到控制並發的效果C#

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lock鎖的是地址

而.net有內部機制使得相同的字串記憶體位址是相同的(new string)除外

下面上實驗代碼

 

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("上鎖2s key="+key);                Thread.Sleep(2000);                Console.WriteLine("解鎖");            }        }    }}

　　運行

 

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("上鎖2s key="+key);                Thread.Sleep(2000);                Console.WriteLine("解鎖");            }        }    }}

　　通過new字串得出的運行結果

 

通過鎖字串達到控制並發的效果C#