public void Test2()
{
var num = new TestLockNum();
num.Num = 5;
RecursionLock2(num);
}
private void RecursionLock2(TestLockNum num)
{
if (num.Num < 3)
{
return;
}
lock (_lock)
{
Console.WriteLine($"序号：{num.Num}，线程ID：{Thread.CurrentThread.ManagedThreadId}，开始");
Thread.Sleep(2000);
RecursionLock(--num.Num);
Console.WriteLine($"序号：{num.Num}，线程ID：{Thread.CurrentThread.ManagedThreadId}，结束");
}
}