Control concurrency with lock string C #

Lock is the address.

and. NET has an internal mechanism that makes the same string memory addresses the same (new string) except

The experiment code below

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 ("Lock 2s key=" +key);                Thread.Sleep (+);                Console.WriteLine ("Unlock");}}}    

Run

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 S Tring (' 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 ("Lock 2s key=" +key);                Thread.Sleep (+);                Console.WriteLine ("Unlock");}}}    

Run results from the new string

Control concurrency with lock string C #