先看代码：
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//设置可以同时处于活动状态的线程池的请求数目。 bool pool = ThreadPool.SetMaxThreads(8, 8);if (pool) { ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数1")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数2")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数3")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数4")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数5")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数6")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数7")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数8")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数9")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数10")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数11"));}; |
上面代码先设置线程池中最大并发量为8个，然后通过QueueUserWorkItem向线程池中添加11个方法，运行，输出结果：
可以看出，先运行了8个，当有一个任务结束后线程池中有空闲线程时，排队的下一个任务才会执行，
把最大并发量改成9试试：
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{ //设置可以同时处于活动状态的线程池的请求数目。 bool pool = ThreadPool.SetMaxThreads(9, 9); if (pool) { ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数1")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数2")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数3")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数4")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数5")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数6")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数7")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数8")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数9")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数10")); ThreadPool.QueueUserWorkItem(o => this.DoSomethingLong("参数11")); };} |
运行结果：
果然没错，这次是先执行9个，当有空闲线程时再执行下一个
总结一下
QueueUserWorkItem：将方法排入队列以便执行。 此方法在有线程池线程变得可用时执行。
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原文链接：https://blog.csdn.net/wwwwerewrew/article/details/106049335
