C#线程锁

namespace ConsoleApp5
{
    internal class Program
    {
        public static int index;
        static void Main(string[] args)
        {
            for (int i = 0; i < 5; i++)
            {
                Thread thread = new Thread(FuncThread);
                thread.Start();
            }
            //等待所有线程执行完毕
            Thread.Sleep(5000);
            Console.ReadKey();
        }
        public static void FuncThread()
        {
            for (int i = 0; i < 5; i++)
            {
                index++;
                string threadId = string.Format("线程id:{0:D3}", Thread.CurrentThread.ManagedThreadId);
                string indexStr = string.Format("   {0:D3}", index);
                string str = threadId + indexStr;
                Console.WriteLine(str);
            }
        }
    }
}

创建多线程，调用同一个资源index，不加锁 在单独的线程中会出现跳跃状态，修改代码如下

namespace ConsoleApp5
{
    internal class Program
    {
        public static int index;
        public static object threadLock = new object();
        static void Main(string[] args)
        {
            for (int i = 0; i < 5; i++)
            {
                Thread thread = new Thread(FuncThread);
                thread.Start();
            }
            //等待所有线程执行完毕
            Thread.Sleep(5000);
            Console.ReadKey();
        }
        public static void FuncThread()
        {
            for (int i = 0; i < 5; i++)
            {
                lock (threadLock)//对于引用到index（公共资源的地方加锁）
                {
                    index++;
                    string threadId = string.Format("线程id:{0:D3}", Thread.CurrentThread.ManagedThreadId);
                    string indexStr = string.Format("   {0:D3}", index);
                    string str = threadId + indexStr;
                    Console.WriteLine(str);
                }
            }
        }
    }
}

　　会得到如下结果