lock鎖的是地址

而.net有內部機制使得相同的字符串內存地址是相同的(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");
 
            }
        }
 
    }
}
 

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字符串得出的運行結果

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

通過鎖字符串達到控制並發的效果C#