避免lock(this)容易发生死锁

避免lock(this)

lock(this)容易发生死锁
应该对私有引用变量加锁
下面是发生死锁示例
program.cs

// See https://aka.ms/new-console-template for more information

using DeadLock;

Console.WriteLine("Hello, World!");

SynchroThis st = new SynchroThis();
Monitor.Enter(st);
// 对象本身已经被锁 ，所以Work中lock一直无法等待到锁释放，发生死锁

//Monitor.Exit(st);提前释放锁

Thread t = new Thread(st.Work);
t.Start();
t.Join();
//程序不会执行到这里
Console.WriteLine("程序结束");

internal class SynchroThis
    {
        private int i = 0;

        /// <summary>
        /// lock(this)不够健壮
        /// </summary>
        /// <param name="state"></param>
        public void Work(Object state)
        {
            lock (this)
            {
                Console.WriteLine($@"i的值为{i.ToString()}");
                i++;
                Thread.Sleep(200);
                Console.WriteLine($@"i自增，i的值为{i.ToString()}");
            }
        }
    }

Examples

https://github.com/huzuohuyou/DotNet6-Examples/tree/main/DeadLock