C# ThreadPool之QueueUserWorkItem使用案例详解

先看代码:

//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:

4984FD7F-B009-5200-D846-6550BD3054A7.png

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:

{
                //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:

CA8D009F-71BD-7409-C21E-A33596E90C6F.png

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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