线程池ThreadPool.QueueUserWorkItem的问题

[xiaoruanzhu]

List<Action> actions = new List<Action>();

actions.Add(()=>{Console.WriteLine("A-1");});
actions.Add(()=>{Console.WriteLine("A-2");});
actions.Add(()=>{Console.WriteLine("A-3");});
actions.Add(()=>{Console.WriteLine("A-4");});

foreach (var action in actions)
{
ThreadPool.UnsafeQueueUserWorkItem(state => action(), null);
}
输出的结果不是按顺序的好理解，可为什么这样书写
foreach (var action in actions)
{
var tempAction = action;
ThreadPool.QueueUserWorkItem(state => tempAction(), null);
}
结果就是按顺序输出呢

[Poopaye]

运气

[娃都会打酱油了]

List<Action> actions = new List<Action>();

actions.Add(() => { Console.WriteLine("A-1"); });
actions.Add(() => { Console.WriteLine("A-2"); });
actions.Add(() => { Console.WriteLine("A-3"); });
actions.Add(() => { Console.WriteLine("A-4"); });
for (var i = 0; i < 10; i++)
{
    foreach (var action in actions)
    {
        var tempAction = action;
        ThreadPool.QueueUserWorkItem(state => tempAction(), null);
    }
}

执行结果