通过锁字符串达到控制并发的效果C#

 

lock锁的是内存地址

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

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace ConsoleApp
{
    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)
            {
                GCHandle handle = GCHandle.Alloc(key, GCHandleType.Pinned);
                //获取内存地址
                IntPtr address = handle.AddrOfPinnedObject();

                Console.WriteLine("上锁2s key=" + key + " 内存地址：" + address);
                Thread.Sleep(2000);
                Console.WriteLine("解锁");

            }
        }

    }


}

运行效果图：

 

using System;
using System.Collections.Generic;
using System.Linq;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;

namespace ConsoleApp
{
    //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)
            {
                GCHandle handle = GCHandle.Alloc(key, GCHandleType.Pinned);
                //获取内存地址
                IntPtr address = handle.AddrOfPinnedObject();

                Console.WriteLine("上锁2s key=" + key + " 内存地址：" + address);
                Thread.Sleep(2000);
                Console.WriteLine("解锁");

            }
        }

    }


    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();
        }
    }







}

 

运行效果图：